On a bicycle, the cogset 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. Cogsets come in two varieties, cassettes or freewheels, 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 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. British CEI (Cycle Engineers Institute) thread was adopted as the international standard and is now known as B.S.C. - British Standard Cycle and is a standardized right-hand thread (1.375 x 24 TPI) 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, moved the bearing 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 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 clusters became physically wider, the freehub design overcame the axle/bearing problem with threaded hubs and began to supersede the freewheel design. Today it is rare to find a freewheel on a new bicycle with more than seven 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 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 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, the entire set referred to as a cluster. Cassettes resemble freewheels when installed, but are clearly different when removed as they do not contain 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 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 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 derailleured bicycles use this newer design.
Number and width of sprockets
Over time, the number of sprockets in a cogset has increased, from three or four before World War II, to five used from the 1950s to the 1970s, up to the eight, nine, ten or eleven now 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 (measured as the Over Locknut Distance - O.L.D.) was lengthened, necessitating more dish on 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 O.L.D. (five-speed/compact six) to 126 mm O.L.D. (six-speed/compact seven) through to 130 mm O.L.D. (threaded seven-speed) for a road bike. MTB rear spacing is normally 135 mm O.L.D. Another advantage of the Shimano cassette hubs introduced from 1978 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 standard width of a five-speed or compact six freewheel was 32 mm, but 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 six- and seven-speed cassettes was 36 mm, and early eight-speed 40 mm wide. Shimano then changed again and standardised eight-11 speed cassettes on 41.5 mm and second generation seven-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 seven-speed cassettes are 36 mm wide, with sprocket spacing of 3.65 mm, but levers and rear dearilleurs are not compatible with later Shimano seven-speed cassettes, which are 38 mm wide and have 3.2 mm sprocket spacing. An eight-speed cassette is wider at 41.5 mm than a second generation Shimano seven. This results in functionally compatible shifters, but specific freehub bodies, or necessitating the use of a spacer with a seven-speed cassette on an eight-speed hub. Eight- and nine-speed cassettes and freehub bodies have the same width (41.5 mm), but with the sprockets closer together; as a result the shifters are not compatible, but they use the same freehub bodies. Ten-speed cassettes are slightly more narrow than eight/nine so they fit on those freehubs but need a spacer, conversely eight/nine-speed cassettes do not fit on ten-speed freehubs.
This progression has provided more fine adjustment of gear ratio, however 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 nine-speed system require more frequent replacement than an eight. The narrowing of the hub flanges has created more dish in 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.
Improvements in shifting
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 was previously possible, and for smoother and cleaner shifting. The different systems are branded Hyperglide by Shimano, UltraDrive by Campagnolo, and OpenGlide by SRAM. The chain itself is specifically manufactured for ease of shifting, and to interface with a particular manufacturer's shift ramps; using a different type of chain may result in sub-optimal shifting.
- Brown, Sheldon. "Bicycle Glossary" (html). Retrieved 2010-05-24.
- "Sheldon Brown: Traditional Thread-on Freewheels". Retrieved 2008-09-29.
- "Sheldon Brown: Freewheel or Cassette?". Retrieved 2008-08-18.
- Ron Kitching (1979). Cycleparts International Handbook. Harrogate.
- "Wheels / Hub Tech Help". Dan's Competition. Retrieved 2011-08-18. "Currently with a cassette hub you can run as small as an 8t sprocket. The smallest a freewheel hub can go is 13t."
- Frank J. Berto (1998-08-26). "Sunset for Suntour". Proceedings of the 9th International Cycle History Conference. Van der Plas. Retrieved 2008-09-25.
- Sheldon Brown. "Over-Locknut-Dimension". Retrieved 2010-05-24.
- Juden, Chris (2005-07-20). "Rear Shifting". CTC - the UK's national cyclists' organisation. Retrieved 2008-12-12.
- Park Tools webpage containing basic freewheel & freehub repair info
- How to replace a cassette cluster (video)