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116:. This distance acts as a leverage force on the axle. Since the freehub can have its bearings near the end of the cassette (and the dropout), axle bending and breaks are far less common. Not all manufactures/models use this design. Those designs often use an axle made from oversize aluminum to compensate for the additional
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from leg muscles, it is difficult to loosen and remove the freewheels. A freehub, on the other hand, has cogs that slide onto an axially-splined cylindrical outer shell. A lockring or the last cog(s) are threaded onto the freehub. It is fastened to the wheel hub itself with a hollow retaining screw
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Beyond removal from the hub and of the cassette, there is limited, if any, access for cleaning and lubrication. The part can be fabricated relatively inexpensively and is not intended to be serviced or disassembled with hand tools. The latter is only possible by means of specialized or shop
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The concept of a freehub was devised and manufactured by
British company Bayliss-Wiley in 1938 and won the Cyclists Touring Club (CTC) award for that year. On the Bayliss-Wiley design the freewheel unit was threaded to accept the sprockets. A different 4-speed design was manufactured by
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mountain bike (Eagle
Transmission, Eagle (NX and SX excluded), XX1, X01, GX and X01 DH) and road bike (RED Etap AXS, Force Etap AXS, Rival Etap AXS and XPLR (Apex excluded)) cassettes with 10T sprocket and E*Thirteen mountain and road bike (Helix and TRS) cassettes with 9T
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Freehubs, manufactured by various companies, are now common on mid- to high-end bicycles today. Nevertheless, freewheels continue to be fitted on some new bikes, especially single speed, and cheaper models of derailleur bicycles.
65:, an older technology, which contains both the sprockets and a ratcheting mechanism in a single unit separate from the hub. In many high-end and midrange bicycles, freehubs have replaced freewheel systems.
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A freewheel mechanism allows a rider to stop pedalling whilst the cycle is still in forward motion. On a cycle without a freewheel mechanism, the rider has to keep pedalling whenever the cycle is moving.
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made their first freehub in 1978 in both the Dura-Ace, and 600 (later known as
Ultegra) models. It was a significant improvement. It proved to be the first widely used commercially successful freehub.
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in 1949 to accompany their BSA 4 Star derailleur gear. The BSA design had a splined freewheel unit (BSA part No.8-1913) which attached to the hub shell (BSA part No.8-701) and carried four sprockets.
97:, the freewheel is continuously kept tight, as chain torque is in the right-hand direction. This becomes a problem when the freewheel needs to be removed. Having undergone high
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The ball bearings for the wheel's axle are in the hub, but a multi-speed freewheel requires a considerable distance between the drive-side bearings and the drive-side frame
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The chain gear sprockets wear faster than the ratcheting mechanism. Replacing individual sprockets on a freehub cassette is easy compared to that on some freewheels.
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Hyperglide 11 or HG-11: Fits 11 speed and 12 speed cassettes with down to 11T sprocket, and is wider than the original
Hyperglide.
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Hyperglide or HG: Fits 7, 8, 9 and 10-speed cassette with down to 11-teeth (11T) sprockets, and is a very common freehub.
50:
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Bicycle
Replacement Parts - Catalogue of Genuine B.S.A Spares for B.S.A., Sunbeam and New Hudson Bicycles
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mountain bike (XTR M9100, Deore XT M8100, SLX M7100 and Deore M6100) cassettes with 10T sprocket.
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N3W: Fits
Campagnolo EKAR 13 speed cassette and older 9-12 speed Campagnolo cassette.
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The freehub concept answers several drawbacks encountered with the freewheel design:
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Freewheels are threaded onto an axle hub, using conventional right-hand
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297:, USA: Cycle Publishing/Van der Plas Publications. pp. 263–264.
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The
Dancing Chain: History and Development of the Derailleur Bicycle
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The
Dancing Chain: History and Development of the Derailleur Bicycle
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on some models) through which the axle is inserted during operation.
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61:. The ratcheting mechanism is a part of the hub, in contrast to a
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and bearings is pressed into place at the factory, secured by
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Berto, Frank J.; Ron
Shepherd; et al. (2005) .
335:, USA: Cycle Publishing/Van der Plas Publications.
373:Exploded view of Shimano FH-7800 rear freehub
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276:. B.S.A. Cycles Limited. 1951. p. 87.
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178:XD and XDR: Fits 11-speed and 12-speed
325:Berto, Frank J.; et al. (2016) .
125:equipment. The outer cup covering the
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57:shaft of the freehub to engage the
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160:Types of freehub body fitments
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171:Microspline: Fits 12 speed
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23:A Shimano Dura-Ace freehub
229:"Bayliss-Wiley unit hub"
81:Freehub vs freewheel hub
73:Comparison to freewheels
293:(2nd ? ed.).
93:. As the bicycle rider
102:(for example, using a
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369:from sheldonbrown.com
190:9-12 speed cassettes.
186:Campagnolo: Fits all
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53:") is mounted onto a
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254:"Bayliss-Wiley hubs"
38:that incorporates a
16:Type of bicycle hub
367:Bicycle Freewheels
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342:978-1-892495-77-8
333:San Francisco, CA
304:978-1-892495-59-4
295:San Francisco, CA
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233:the original
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120:on the axle.
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49:(called a "
42:mechanism.
259:2010-05-16
239:2010-05-16
215:References
188:Campagnolo
40:ratcheting
183:sprocket.
63:freewheel
47:sprockets
45:A set of
382:Category
198:See also
51:cassette
348:May 30,
310:May 30,
173:Shimano
150:Shimano
137:History
114:dropout
104:hex key
91:threads
55:splined
33:bicycle
29:freehub
339:
301:
209:Cogset
99:torque
95:pedals
59:chain
350:2017
337:ISBN
312:2017
299:ISBN
180:SRAM
36:hub
384::
27:A
352:.
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