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29-476: Micro drive is a type of bicycle drivetrain , mostly BMX and MTB , that uses smaller than standard-sized sprockets . The smallest rear sprocket that fits on a freehub body is a 10 or 11-tooth, but with the use of a cassette hub, sometimes called a micro drive rear hub , sprockets as small as 8 teeth may be used. Some examples of micro drive hubs are Shimano Microspline (12-speed, 10-teeth) and SRAM XD/XDR (11/12-speed, 9-teeth). The advantage of micro drive

58-518: A bicycle , the cassette or cluster is the set of multiple sprockets that attaches to the hub on the rear wheel . A cogset works with a rear derailleur to provide multiple gear ratios to the rider. Cassettes come in two varieties, freewheels or cassettes , of which cassettes are a newer development. Although cassettes and freewheels perform the same function and look almost the same when installed, they have important mechanical differences and are not interchangeable. A freewheel (also known as

87-419: A block ) consists of either a single sprocket or a set of sprockets mounted on a body which contains an internal ratcheting mechanism and mounts on a threaded hub. Threaded rear hubs were available in different thread patterns depending on the country of manufacture, French and British threads being the most common. The British Cycle Engineers Institute (CEI) thread was adopted as the international standard and

116-508: A cassette has a series of straight splines that form the mechanical connection between the sprockets and the cassette compatible hub, called a freehub , which contains the ratcheting mechanism. The entire cassette is held on the hub by means of a threaded lockring . Some cassette systems from the late 1980s and early 1990s use a threaded small sprocket to hold on the larger splined sprockets. Cassettes resemble freewheels when installed, but are clearly different when removed as they do not contain

145-435: A cogset has increased, from 3 or 4 before World War II , to 5 used from the 1950s to the 1970s, up to the 8, 9, 10, 11, 12, and even 13 in the 2010s found on modern bikes. As more rear sprockets were added, the combination became wider, and the sprocket spacing narrower. One of the ways to make space for this was the axle length (measured as the o ver l ocknut d istance — OLD. ) was increased, necessitating more dish on

174-415: A freewheel's internal ratcheting mechanism. The sprockets in a cassette are usually held together by three small bolts or rivets for ease of installation. These keep the sprockets and spacers in the correct order and position when they are removed from the freehub body. When the sprockets need to be replaced due to wear or the user wishes to change gear ratios available, only the sprockets are replaced, not

203-477: A second belt to transfer power to the front wheel. A cyclist's legs produce power optimally within a narrow pedalling speed range . Gearing is optimized to use this narrow range as best as possible. Bicycle drivetrain systems have been developed to convert speed and torque by a variety of methods. Several technologies have been developed to alter gear ratios. They can be used individually, as an external derailleur or an internal hub gear, or in combinations such as

232-404: A standard 5 speed freewheel but required a narrower chain than the standard. The concept was copied by European freewheel manufacturers Regina (Italy) and Maillard (France). As the number of sprockets on a multiple freewheel increased, and became physically wider, the freehub design overcame the axle/bearing problem associated with threaded hubs and began to supersede the freewheel design. Today it

261-513: A two-wheel drive option. Their AWD system, aimed at mountain bikers, comprises an adapted differential that sends power to the front wheel once the rear begins to slip. In the late 1990s, 2WD 'Dual Power' mountain bikes were sold in Germany under the Subaru name. They used one belt to transfer power from the rear wheel to the head tube, a small gearbox to allow rotation of the front fork, and then

290-417: A variety of methods. Most bicycle drivetrain systems incorporate a freewheel to allow coasting , but direct-drive and fixed-gear systems do not. The latter are sometimes also described as bicycle brake systems . Some human powered vehicles, both historical and modern, employ direct-drive . Examples include most Penny-farthings, unicycles, and children's tricycles . Another interpretation of direct-drive

319-420: Is closely linked to the history of the bicycle . Major changes in bicycle form have often been initiated or accompanied by advances in drivetrain systems. Several early drivetrains used straight-cut gears that meshed directly with each other outside of the hub. Some bicycles have used a double-sided rear wheel, with different-sized sprockets on each side. To change gears, the rider would stop and dismount, remove

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348-437: Is increased stresses on the drive train, leading to increased wear and even premature failure. As the front and rear sprockets become smaller, the tension in the chain increases, and stretching and breaking can occur more easily. Designers can overcome these issues by choosing materials with higher yield strengths , however usually at higher costs. Bicycle drivetrain systems The history of bicycle drivetrain systems

377-429: Is now known as British Standard Cycle (BSC). It is a standardized right-hand 1-3/8″-24 TPI (M34.925×1.058 mm) thread onto which a standard freewheel is screwed. This allows different brands of freewheels to be mounted on different brands of hubs. The major disadvantage of the multiple sprocket freewheel design is that the drive-side bearing is located inboard of the freewheel, and as sprockets were added over time,

406-469: Is rare to find a freewheel on a new bicycle with more than 7 speeds. Some new single-speed  — especially BMX and utility bikes  — and lower-end multi-geared bicycles continue to be manufactured and sold with freewheels. Pedaling forces tighten a freewheel onto the hub, so no tool is required to install one. The ratcheting mechanism prevents the freewheel being loosened when the sprockets are turned counter-clockwise. A freewheel can be removed from

435-421: Is that it means a smaller front sprocket, or chainring , can be used without affecting the gear ratio , providing better ground clearance. For example, a bike using a 32-tooth chainring with a 16-tooth rear sprocket can switch to using an 18-tooth chainring and a 9-tooth sprocket, and still have a 2:1 ratio. Another advantage is the reduction in weight with the reduction in size of all the parts. The disadvantage

464-474: Is that the rider pushes directly against the ground with a foot, as employed in balance bicycles , kick scooters , and chukudus . In 1991, a two-wheel drive bicycle was marketed under the Legacy name. It used a flexible shaft and two bevel gears to transmit torque from the rear wheel, driven by a conventional bicycle chain with derailleurs, to the front wheel. In 1994, Steve Christini and Mike Dunn introduced

493-411: Is wider at 41.5 mm than a second generation Shimano 7. This results in functionally compatible shifters, but specific freehub bodies, or necessitating the use of a spacer with a 7-speed cassette on an 8-speed hub. 8- and 9-speed cassettes and freehub bodies have the same width (41.5 mm), yet the sprockets on the 9-speed are closer together; as a result the shifters are not compatible, but they use

522-539: The SRAM Dual Drive , which uses a standard 8 or 9-speed cassette mounted on a three-speed internally geared hub, offering a similar gear range as a bicycle with a cassette and triple chainrings . While several combinations of power collection, transmission, and conversion exist, not all combinations are feasible. For example, a shaft-drive is usually accompanied by a hub gear, and derailleurs are usually implemented with chain drive. Cogset#Cassettes On

551-402: The bearing moved inward, farther from the drive-side axle support. This resulted in more flexing stress being placed on the axle , which can bend or even break. Multiple speed freewheels were common on quality high end bikes until the late 1980s. Suntour — Maeda Industries (Japan) introduced a compact 6 speed freewheel which reduced the spacing between the sprockets and was the same width as

580-422: The freewheel. This greatly reduces the stress on the rear axle, making bent or broken axles extremely rare. Since their introduction in the late 1970s cassettes have been used on increasing numbers of bicycles, starting at the high-end and over time becoming available on less expensive bikes. Today the vast majority of bicycles with derailleur gears use this newer design. Over time, the number of sprockets in

609-452: The hub with one of the many specific freewheel removal tools that engages a spline or set of notches on the outboard end of the freewheel. Removal often requires considerable effort due to the large torque that tightens the freewheel during pedaling, and some freewheels cannot be removed intact. Future removal of a freewheel is facilitated by grease on the freewheel threads before installation. Cassettes are distinguished from freewheels in that

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638-403: The ratchet mechanism. Cassettes also allow the use of sprockets with fewer teeth, as in micro drive systems. The ratchet mechanism, known as the freehub body, is still replaceable on most hubs, but forms a structural part of the hub. Cassette systems have a major advantage in that the drive-side axle bearing can be out near the frame, rather than being back towards the centre of the axle behind

667-406: The rear wheel and reinstall it in the reverse direction. Derailleur systems were first developed in the late 19th century, but the modern cable-operated parallelogram derailleur was invented in the 1950s. Bicycle drivetrain systems have been developed to collect power from riders by a variety of methods. Bicycle drivetrain systems have been developed to transmit power from riders to drive wheels by

696-487: The rear wheel drive side with a threaded hub to centre the wheel in the frame. The hub flanges spacing was not shortened on threaded hubs, rather the axle length increased from 120 mm OLD (5-speed/compact-6) to 126 mm OLD (6-speed/compact-7) through to 130 mm OLD (threaded 7-speed) for a road bike. MTB rear spacing is normally 135 mm OLD. Another advantage of the Shimano cassette hubs introduced from 1978

725-461: The same freehub bodies. This development continued with 10-speed cassettes, but branched out for 11-speed cassettes. With them, new freehub bodies emerged which were either wider (Shimano road 11-speed) or entirely different (SRAM XD, XDr, which differ in width and both provide the space for a 10-tooth cog). For 12-speed, Shimano introduced a new freehub body as well (Microspline). This progression has provided more fine adjustment of gear ratio, however

754-422: The use of thinner metal parts has had the effect of shortening the life-span of the chain and sprockets due to so called " stretching " of the chain. This is caused by frictional abrasion of the load-bearing surfaces of the chain causing elongation. As such, the chain and sprockets of a 9-speed system require more frequent replacement than an 8-speed system. The narrowing of the hub flanges has created more dish in

783-431: The wheel, which weakens the wheel if all other factors are the same, but improvements in the strength and reliability of spokes and rims has more than balanced this out, and wheel strength is generally higher despite the increased dish. Shift ramps are complex tooth profiles, in the rear sprockets and front chainrings , designed to pick up and drop the chain during shifting. They allow for shifting under greater load than

812-646: Was 36 mm, and early 8-speed 40 mm wide. Shimano then changed again and standardised 8-11 speed cassettes on 41.5 mm and second generation 7-speed to 38 mm. The widening of the sprocket carrier on the cassette hubs to 41.5 mm resulted in a decrease in the distance between the hub flanges. For Shimano and SRAM the cassette spacing developed as follows. Early Shimano 7-speed cassettes are 36 mm wide, with sprocket spacing of 3.65 mm, but levers and rear derailleurs are not compatible with later Shimano 7-speed cassettes, which are 38 mm wide and have 3.2 mm sprocket spacing. An 8-speed cassette

841-613: Was that the rear hub flanges were wider apart than those of a threaded hub, so built a stronger wheel with less dish and without the problem of increased bearing stress or axle failure. Before the introduction of indexed shifting, the width of a 5-speed or compact-6 freewheel was approximately 32 mm; the introduction of indexed shifting supposedly made standardized sprocket spacing necessary. Shimano and Campagnolo both came up with independent standards, and SRAM later followed Shimano's lead in respect to sprocket spacing and cassette width. The width of early Shimano 6- and 7-speed cassettes

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