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Everything Bicycling

Thursday
Sep 09th
Home arrow Cycling Terms arrow Mandibular Disharmony - Pedal Threading Action
From 'Mandibular Disharmony' to 'Pedal Threading Action' Print E-mail
mandibular disharmony A MTBiking term. How one's jaw feels when it and the handle bars attempt to occupy the same space and time. Ques: "Pray, what's wrong?"   Ans:  "I've got mandibular disharmony."Bicyclesource.com
mantrap A MTBiking term. A hole covered with autumn leaves, resembling solid earth and effective at eating the front wheel of the unsuspecting rider.Bicyclesource.com
ManualA BMX term. Riding with the front wheel held in the air, without pedalling. A coasting wheelie.Wikipedia.com
manualManual. Used to describe lifting the front wheel off the ground by using a shift of body weight to keep it there, sometimes necessary to negotiate an obstacle.  See Wheelie.Sheldon Brown
Marin Pronounced 'muh RINN' -  the county in Northern California where MTBing is said to have been invented -just north of the Golden Gate Bridge.Bicyclesource.com
masherA cyclist who habitually pedals hard in a high gear, at slow cadence. The opposite of a "spinner." The "mashing" style is likely to cause injury and leg cramps.Sheldon Brown
mass start

A race in which all the competitors start together at the same time, as opposed to time-trials or pursuits. Mass-start races were illegal in Britain for many years, which is a major reason for the popularity of time trials there. Theses days there are truly massive cycling events in the world, such as the New York Fivo, Cananda’s Le Tour de L’ille de Montreal. South Africa’s Argus and 94.7 Cycle Challenge attracts 30 000 cyclists each, and constitute individually timed events.

 

Sheldon Brown
master link

A special chain link designed to be easily disassembled and re-assembled. Most simple bicycles have these, but they are not generally used on bicycles with derailleur gearing, because conventional master links are too bulky to clear the closely spaced sprockets. The Craig Super Link and SRAM/Sachs Power Link are special master links, and a good choice for a cyclist who wishes to be able to remove the chain for cleaning.

 

Sheldon Brown
match sprint

Match sprint. A track event for two riders (who start together). Each rider would like to be behind the other for most of the race, because the rear rider has the initiative. As a result, most of the distance of a match sprint is covered at a very low speed. Suddenly, one of the riders attacks with a burst of energy, and the tempo changes from a slow cat-and-mouse dance to a full-out blast. This is the most popular track event.

 

Sheldon Brown
Mathauser ®An American manufacturer of brakes and brake-shoes. Mathauser was an early producer of hydraulic brakes, and also makes an unusual type of sidepull brake. Mathauser is best known as a manufacturer of brake shoes (distinctive ugly in rust-red colour), and they are highly recommended by Harris Cyclery.Sheldon Brown
mattress saddleA traditional upholstered saddle, as used on older, less-expensive English 3-speeds (better models used leather saddles.) A mattress saddle has multiple small coil springs running along between the top and bottom of the frame, covered with a layer of felt or horsehair, and a leatherette/vinyl top. This type of saddle almost always has large coil of springs at the back of the frame.Sheldon Brown
Mavic ®A major French manufacturer of parts, Mavic has long been one of the top manufacturers of high-quality rims. In the late '80's they started to branch out into other parts, including very well received hubs and cranksets. "MAVIC" is an acronym from "Manufacture d'Articles Vélocopediques Idoux et Chanel. (Idoux and Chanel were the names of the partners who founded the company in 1890.)Sheldon Brown
measurementsCycling convention dictates that mountainbikes are measured imperially, road and touring bikes metrically. Exceptions to this rule include the cranks which are always measured in milimeters.Richard's bicycle repair manual
mechMech.  British term for derailleur.Sheldon Brown
mechanic A bike mechanic, especially at a professional bike race in Europe. Bicyclesource.com
mechanical advantage

Mechanical Advantage. Every linkage that transmits power has a particular mechanical advantage. This is a ratio between the amount of force applied and the amount delivered. "Work" is defined as a force applied through a distance. When work is transmitted through a mechanism that has a mechanical advantage other than 1:1, the force can be increased at the expense of acting throughout a reduced distance (as in the case of bicycle brakes, or gear shift levers) or the distance can be increased at the expense of reducing the amount of force transmitted (as in the case of the chain drive where the driving sprocket is larger than the driven sprocket).

 

Sheldon Brown
Mercian ®

A very nice British bike. There are all sorts of models, and a great many of these came into the U.S through the big mail order companies. Some models were very ornate. The ornate examples, with N.R. parts in guideline condition are probably worth around $900. Relatively plain examples with N.R. parts are probably worth several hundred less. There are few people who consider these to be super desirable, so they remain a very good value. There was a very plain model called the classic that was remarkably well-constructed that we tried forever to sell. It was such a nice frame with so little of a following. Maybe people will be inspired to take another look at these.

 

Sheldon Brown
Merckx, Eddy

During the glory years of Eddy Merckx's racing career (regarded as the greatest racer of all time), he rode frames bearing his name. They were actually built by a variety of framebuilders - Masi, Colnago, De Rosa . In the 70's, Falcon of England actually produced a Molteni coloured bike bearing the Merckx markings. These bikes had basic frames, low-end parts, and were not terribly exciting. After his racing career ended, Merckx went into frame manufacturing and he sought the assistance of Ugo DeRosa. It is claimed that some of the early Merckx frames were actually produced by DeRosa. Drop outs, for instance, are finished almost identically to the DeRosa style on early Merckx frames. Later Merckx frames became a bit less refined, some even downright sloppy. Merckx frames will always have value because, in addition to the legendary name, they tend to provide a wonderful ride. Merckx makes certain that the bikes bearing his name are designed brilliantly, and that makes quite a difference.

 

Sheldon Brown
Mike's BikesSee everythingbicycling's 'Trader Pages'.everythingbicycling
mile-a-minute MurphyA bicyclist who attained some notoriety around the turn of the previous century by drafting (riding closely behind) a train on level ground, at sixty miles per hour (an astonishing feat at the time).Wikipedia.com
Mirage ™A Campagnolo gruppo available in three versions to allow you to 'interpret your racing bike in the most appropriate manner to you'.  Campagnolo.com
miss & miss outA type of mass start race, usually on a track, sometimes on a criterium course. At each lap, the last rider over the finish line must withdraw, until there is only one rider left. This is also known as "devil take the hindmost."Trackcycling.co.za
Missy Giove A MTBiking term. The wildest, fastest chick on Planet Dirt. If she doesn't crash and injure herself, she's guaranteed to win. Tattoos and hair and piercings. She races for Cannondale. There are probably only ten men on earth faster than her, and she's knocking them off, one-by-one.Bicyclesource.com
mixte

A style of lady's frame in which the "top tube" consists of a pair of small diameter tubes running more-or-less straight from the upper head lug, past the seat tube, and on to the rear fork ends. A mixte frame has 3 sets of rear stays, instead of two. A variant on the mixte uses a single, full sized top tube running from the upper head tube to the seat tube, but retains the middle set of stays. A lady's type bike that lacks the middle pair of stays is not a mixte. Mixte frames are stronger than conventional lady's frames, particularly in resisting the tendency of the seat tube to get pushed backward in the middle when ridden by a heavy rider. Although technically less strong and stiff, the Mixte design has proven very durable. Interestingly the mixte frame has very good general feautures in offroad - downhill application as a result of the lower centre of gravity and lower standover height.

 

Sheldon Brown
mo A MTBiking term -  momentum - "If you don't get in gear at the bottom of that hill, you'll lose your mo."Bicyclesource.com
Modolo ®An Italian manufacturer of brakes. They were the first to offer "aero" brake levers on a commercial basis.Sheldon Brown
modulation A MTBiking term. The ability to finely and consistantly select a specific braking force, rather than moving straight from no braking power to locked wheels and an endo. Hydraulic brakes have great modulation; V-Brake less.Bicyclesource.com
mojo Charm or icon worn by a biker or attached to the bike.Bicyclesource.com
mono pivotA MTBiking term. A type of (full suspension) frame in which the suspension consists of a single arm or triangle, rotating about the main pivot.mundobiker.es
monocoqueA structure built as a hollow shell, without an interior framework. The strength of a monocoque structure comes from the shell. Monocoque bicycle frames are uncommon, but have been made from carbon fibre and from formed sheet aluminium, and have interesting application for bikes with suspension.Sheldon Brown
montAn Alpe that is not in the Alps.University of Toronto
Mont Ventoux

Mont Ventoux is a mountain in the Provence region of southern France, located some 20 km north-east of Carpentras, Vaucluse. It is by far the biggest mountain in the region and has been dubbed the "Giant of Provence". The road over the mountain is often closed due to high winds. The top of the mountain is bare limestone without vegetation or trees, but despite being  originally forested it was systematically stripped of trees from the 12th century to serve the demands of the shipbuilders of the naval port of Toulon. Mont Ventoux achieved worldwide notoriety when it claimed the life of Tom Simpson, who died here on July 13, 1967, from a combination of amphetamines, alcohol and heat exhaustion. (There is a memorial to Simpson near the summit.) In 1970, Eddy Merckx rode himself to collapse while winning this stage. He received oxygen, recovered, and won the Tour.

 

Wikipedia.com
moto A MTBiking term. Also Motor Official. A race referee or official who uses a motorcycle during the bicycle race event. The motor referee is often primarily responsible for centerline rule enforcement during road races using a rolling enclosure. Motor officials are also used to keep track of riders where cars and the peloton cannot mix (narrow roads, winding roads, etc.).Bicyclesource.com

motor

marshal

Race staff on motorcycles responsible for assisting in keeping a racecourse clear and safe for competitors, usually in conjunction with a rolling or protected enclosure.Bicyclesource.com
motorpacei) A training method where a rider follows a motorcycle or other vehicle to break the wind to allow drafting. ii) An event in which a bicycle drafts behind a motor vehicle. This was the most popular form of track racing in the 1920s and '30s. Special motorcycles called "Dernys" are used for track events. The motorcycle driver sits very erect and far back to improve the drafting effect. There is a horizontal roller mounted behind the rear wheel, so that, if the bicycle gets too close, the bicycle's front wheel will hit the roller, rather than a rigid part of the motorcycle. Some road racers train behind a motorcycle, which allows the coach to accompany the rider, and teaches the cyclist to be comfortable controlling the bicycle at higher-than-average speeds.Sheldon Brown
Moulton ®Dr. Alex Moulton, noted automobile designer, is also a cyclist and bicycle designer/manufacturer. He was an early pioneer in the development of fully-suspended bicycles. The original Moulton bicycles of the 1960's had 16 x 1 3/8" (ISO 349 mm) wheels. The small wheels reduce unsprung weight, reduce the overall size of the bicycle, and allow luggage to be carried lower, lowering the centre of gravity. The 349 mm size was originally a juvenile size, and the fairly wide, low-pressure tyres limited the performance of the early Moultons. Later models, currently known as "Alex Moultons" or "AMs" use a slightly larger diameter tyre/rim (ISO 369 / 17 x 1 1/4) developed specifically to Moulton's requirements. The current "AM" series uses a very elaborate "space frame", consisting of a network of many pieces of small-diameter steel tubing, lined together into a truss made up of many small triangles. AM models separate into two roughly equal-sized pieces for ease of transport. There is also an "APB model with 406 mm (20") wheels.Sheldon Brown
mountain bikeMountain Bike. "Mountain bike" (MTB) is the currently preferred term for bicycles made for off-road use. Mountain bicycles use 559 mm wheels, have at least 15 speeds, and usually have cantilever brakes. There was an attempt to make a copyright out of "MountainBike", but the term has become generic. Some have tried to promote the term "All Terrain Bike" (ATB) as an alternative, or to designate some subtle variant of the mountain bike, but this term has largely fallen into disuse. The mountain bike is in many ways a hybrid design, a cross between a BMX bicycle and a touring bicycle.  Sheldon Brown
mountainbike-aneering A MTBiking term. Off shoot sport of mountain biking where peak bagging is a prime consideration. Another sport featuring the "because it's there" attitude.Bicyclesource.com
moustache handlebarA style of handlebar similar to an inverted North Road bar, but flatter and wider, with larger radius bends. Usually supplied in "road" diameter (23.8 mm / 15/16") used with drop-bar type brake levers, often with barcons. Previously available in a smaller diameter (22.2mm / 7/8") for use with mountain bike type controls. Designed by Grant Petersen, formerly of Bridgestone bicycles. This was standard equipment on the legendary XO-series Bridgestones.Sheldon Brown
mud bogging A MTBiking term. Riding through muck for fun.Bicyclesource.com
mud diving A MTBiking term. What happens when a bike slows abruptly in mud, throwing the rider into wet goo.Bicyclesource.com
mud-ectomy A MTBiking term. A shower after a ride on a muddy trail - getting cleaned up.Bicyclesource.com
mudguardBritish term for fender.Sheldon Brown
multiple day stage racingPoint to point racing conducted over several days. Sheldon Brown
musetteA small lightweight cotton shouder bag, used for containing food and drink given to riders in a "feed zone" during a cycle race. The bag is designed so that it can be easily grabbed by a moving rider. The shoulder strap is placed over the head and one shoulder, the contents are then removed and placed into jersey pockets or bottles (bidons) are placed into bottle cages. The bag is then discarded.Sheldon Brown
Nac NacA BMX term. Removing one foot off either pedal and thrusting it behind the seat and above the rear wheel.Wikipedia.com
nard guard A MTBiking term. Used to prevent 'wang chung'.Bicyclesource.com
NCCA A MTBiking term. Abbreviation for National Collegiate Cycling Association . The NCCA is a standing committee of USA Cycling. The NCCA administers, develops, promotes and governs collegiate bicycling across the country. Rules for NCCA bicycle road races are the same as for USCF bicycle race events.Bicyclesource.com
negative spring  A MTBiking term. A spring element added to an air sprung shock to counteract the friction associated with the air seal. Shimano.com
neutral geometryA MTBiking term. A suspension frame is configured that its components do not move relative to one another during action (pedaling or braking), and its natural geometry is 'neutral' if the torque balance is so maintained.mundobiker.es
Nexave ™Shimano speak - componentry.Shimano.com
Nexus ®A series of components made by Shimano. The most remarkable of these are roller brakes for front and rear hubs, and rear hubs with planetary gear sets that have 4, 7 or 8 speeds.Shimano.com
nippleThe nut that secures the end of a spoke to the rim of a bicycle wheel. Nipples have a normal right-hand thread, but because they are normally seen from the "bolt" side, it is often confusing which way to turn them. It is as if you were watching the hands of a clock move clockwise, but the clock was transparent, and you were looking from behind it. Of all the things bicycle mechanics do, adjusting spoke nipples is the one that requires the most skill and experience. If you wish to learn more about this process, see my article on Wheelbuilding.Sheldon Brown
nipple The 'nut' at the end of a spoke that nobody knows the real name for.Bicyclesource.com
nirvana A MTBiking term. The state of being in absolute control and totally in tune with your bike, the trail, and your physical strength. "I was just doing it all so smoothly and delicately and quickly, it was nirvana!" Synonym for The Zone.Bicyclesource.com
no handerA BMX term. Letting go of the handlebars with both hands.Wikipedia.com
No-Footed Can-canA BMX term. Lifting both feet off the pedals and thrusting them to one side of the bike.Wikipedia.com
noodleA curved piece of tubing commonly used to lead the brake cable around a right-angle bend where it attaches to a direct-pull cantilever brake, such as a Shimano V-brake ®. Most direct-pull brakes come with alternate noodles to accommodate left-front or right-front setup.Sheldon Brown
NORBA A MTBiking term. Abbreviations for National Off-Road Bicycling Association. As part of USAC, they organize most of the larger mountain bike races USA.Bicyclesource.com
north road bend The style of handlebar used on most English 3-speed bicycles. This is a fairly narrow bar with a slight rise, grips nearly parallel to the frame. This design was formerly associated with the North Road Cycle Club, north of London. It is a reversible design, most often used in the upright position, but quite serviceable in the dropped position as well, for a more aggressive riding position. In the reversed position, it resembles a Moustache handlebar, but with sharper bends and a bit more drop.Sheldon Brown
North Shore A MTBiking term. Northshore freeriding is a specialised version of freeriding that focuses on manmade structures above the forest floor, the higher the better. It originated in Canada on the northern shoreline’ forests above Vancouver. Urban freeride utilises man made structures also, but uses buildings, walls, fountains, shopping malls and stairs and anything else found... 
Nose ManualA BMX term. Basically the same as a manual except you balance on your front wheel instead of your back wheel, but a bit harder. Without (front) brakes this trick is usually very difficult.Wikipedia.com
NosepickA BMX term. Stalling at the top of the ramp with only the front tyre on the coping, while holding the rear of the bike in the air.Wikipedia.com
NothingA BMX term. Releasing the bike entirely.Wikipedia.com
nuttedA conventional, non-quick-release hub, with a solid axle.Sheldon Brown
Octalink ®Shimano's system of splined bottom brackets.Sheldon Brown
ODA MTBiking term. This is short for "Off Day". Even the best riders have them. It is important to recognize the symptoms and to back off when you are having an O.D.Bicyclesource.com
OEMAcronym - Original Equipment Manufacturer. This refers to parts sold by a parts manufacturer to a bicycle manufacturer for installation on new bicycles at the factory. O.E.M. pricing is the lowest possible price structure, since the parts are sold in the largest quantities. O.E.M. packaging is less expensive per unit, because hundreds of parts are packed in a single crate, with little or no internal packaging material. O.E.M. parts are often cheaper versions of parts sold to the aftermarket, even though they may have the same model designation.Sheldon Brown
off the back A MTBiking term. When a rider is dropped, or cannot keep up with the pace of the windshield (such as a peloton or another rider) and falls behind.Bicyclesource.com
off the front A MTBiking term. When a rider takes part in a breakaway, where one or more riders scoot up ahead of the main peloton in a race.Bicyclesource.com
off-camber bendA corner that slopes away from the direction of the turn which effectively increases the degree of lean that your bike is at, thus decreasing traction available for turning input.Sheldon Brown
off-camber turn A MTBiking term. A turn which would usually be banked in the opposite direction. The road's angle is added to rather than subtracted from the 'lean' angle. Take these turns cautiously for, among other things, your tread may not extend far enough up the side.Bicyclesource.com
on the rivetExpression - describes a rider who is riding at their maximun speed. This refers to road racers' practice of perching on the tip of their saddles when riding at maximum power output, and the single large rivet which would be at the tip of old-style leather racing saddles to attach the shell to the saddle frame.Sheldon Brown
one handerA BMX term. Letting go of the handlebars with one hand.Wikipedia.com
one piece crankA one-piece crank (OPC) consists of a single steel forging which constitutes the left crank, axle, and right crank. This type of crank set is found on older U.S. made bicycles, and many current low-end bicycles. It is also commonly used on BMX and freestyle bicycles. One piece, or "Ashtabula" cranks are heavy but very strong and reliable. They are also much easier to work on than any other type of crankset, requiring no special tools. You can completely overhaul a one-piece-crank bottom bracket with just a large adjustable wrench and a screwdriver.Sheldon Brown
one to one gearingThe sprocket at the cranks is the same size as the one on the rear wheel, so one revolution of the cranks will turn the rear wheel one revolution.Sheldon Brown
onsight flash A MTBiking term. To clean a section with no previous knowledge of its layout or elements.Bicyclesource.com
ordinaryAn antique bicycle with a large front wheel, also known as penny-farthing. See also: Penny-Farthing.Sheldon Brown
OTBThis abbreviation has at least three bicycle-related meanings: Only The Best, a bicycle brand sold by Charlie Hamburger in Boston, 1940s-'50s, Off The Back, i.e. left behind by the peloton, out of the race and Over The Bars, usually resulting from a head-on collision resulting in an unexpected dismount over the handlebars.Sheldon Brown
out & back A MTBiking term. Ride where the return is a retracing of the route out.Bicyclesource.com
overgeared A MTBiking term. A condition where the rider is using a gear combination which is too high or "hard" given the circumstances. Generally results in bogging out or needless fatigue.Bicyclesource.com
over-locknut-dimensionThe distance between the outermost locknuts of a conventional hub axle, or whatever equivalent parts fit against the inside surfaces of the fork ends of a frame. They must match the spacing (see chart) of the frame that the wheels are to be installed in.Sheldon Brown
overshiftWhen a derailleur is out of adjustment, a chain or sprocket are worn, or when a big bump is hit while shifting, it is possible that the chain will fall off the edge of a sprocket. This is an overshift.Sheldon Brown
oversized

Larger in diameter than the traditional sizes, commonly used for headsets and frame tubing. Oversized parts are stiffer, and can be lighter for their weight if the walls are made thin enough. When BMX racing became popular, frames built to these old standards couldn't always hold up to the rigors of BMX competition. Since the wide availability of T.I.G. welding freed designers from the need to use tubes that would fit standard-size lugs, oversized tubing became the norm for BMX frames. This design and technology was later adopted by builders of mountain bicycles. In the interest of improved chainwheel/tyre clearance, some mountain bicycles have "oversized" bottom brackets, with a shell width of 73 mm, rather than the standard 68 mm.

 

Sheldon Brown
over-the-bar blood donor A MTBiking term. A rider who is injured while doing an endo.Bicyclesource.com
pace line

A group of cyclists riding close behind one another in a line, so that each cyclist can draft the cyclist in front, except, of course for the leader, who is taking a turn to pull the rest of the group. Riders will take turns at the front to break the wind, then rotate to the back of the line to rest in the draft. Larger group rides will often form double pacelines with two columns of riders. A group of cyclists in a pace line can maintain a substantially higher speed than even the fastest of the group could do alone. See also: Audax and peloton Group of riders riding at high speed by drafting one another.

 

Sheldon Brown
paceline n. A single file of riders, each of which takes his turn battling the wind at the front.Bicyclesource.com

pacman

braze-on

A special braze on with a slot to hold the end of the reaction arm of a hub brake to the chain stay without the need for a clamp or bolt. This makes removing and replacing the rear wheel of a bike with a hub brake considerably easier. This was first used on Santana tandems.Sheldon Brown
panacheA French cycling term. What Fausto Coppi had that Gino Bartali did not – and what Hugo Koblet had more of than anyone, except maybe Mario Cippolini. University of Toronto
pannier

A bag that hangs alongside one of the wheels of a bicycle. They usually come in pairs. Well-equipped touring cyclists often use two pairs, one on the rear & the other on the front, for better weight distribution. If they are mounted so that the top of the pannier is below the top of the wheel, they are "low riders." Contrary to popular belief, "pannier" is not a French word, and should not be pronounced as one. The normal English pronunciation is: "PAN-yer". "Pannier" is, in fact derived from a French word: "panier", a basket (more specifically, a bread basket, from "pain", the French word for "bread."

 

Sheldon Brown
Parallax ™ Shimano speak - componentry.Sheldon Brown
parcoursA French cycling term. The profile of the race or stage route.Sheldon Brown
Paris -NiceA relatively short stage race from Paris to Nice, placing a premium on strategy, day to day recovery, and climbing ability.Daniel Coyle
Paris-RoubaixFrench held road race from Paris to Roubaix. Also known as I'Enfer du Nord / Hell of the North as a result of a 52km stretch of bone-jarring cobblestones. It constitutes the most prestigious  Monument of Cycling, and is referred to as 'The Queen of the Classics'. Interestingly, riders can be stopped by crossing trains during the race, running the risk of disqualification in not stopping.Wikipedia.com
Park ®A manufacturer of a wide variety of high quality bicycle tools with characteristic blue handles. They are most known for bicycle repair - and wheel truing stands.Sheldon Brown
patronA French cycling term. Literally, the “boss”. The rider who has earned the respect of the peloton to the extent that he need only express his displeasure and thereby enforces the unwritten rules of the race (e.g. Merckx, Hinault, Armstrong). University of Toronto
pavement polish A MTBiking term. The small paralell grooves you find an your bike and its expensive components after you wipe out and smear all aver the blacktop. Pavement polish is the bike equivalent of road rash.Bicyclesource.com
pawl(Pronounced "Paul"). A spring-loaded part that engages a set of teeth when moving in one direction, but slides over them when moving in the other direction. The pawls in a freewheel make a ticking sound when a bicycle coasts. Most freewheels have two/three pawls.Sheldon Brown
pin A short rod within a roller-chain assembly that joins chain links together, and supports the roller . Johan Bornman
pitchThe distance from sprocket cog-to-cog or chainlink-to-link. Johan Bornman
Pedal Grind A BMX term. Grinding on the pedal with the front tyre on the rail or ledge, much like a feeble grind. Generally done by pegless riders.Wikipedia.com
pedal threading actionThe right pedal has a normal thread, but the left pedal has a left (reverse) thread. The reason for this is perhaps not obvious, and due to a phenomenon called "precession". You can demonstrate this to yourself by performing a simple experiment. Hold a pencil loosely in one fist, and move the end of it in a circle. You will see that the pencil, as it rubs against the inside of your fist, rotates in the opposite direction. In bicycles precession has proven to unscrew the left crank if reverse threading is not applied.Sheldon Brown
 
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