G falcon bmx freehub parts4/1/2024 Also popular for mountain bike drivetrains is SRAM’s XD driver standard, where the cassette screws directly onto the body. Most road and some mountain bike set-ups incorporate a Shimano freehub style with a splined-shaft interface, where the cassette slides into place and then is secured by a screw-on retention ring. ![]() ![]() And indeed, mode of cassette attachment is one of the key differentiators when shopping freehub bodies. Some, but not all rear hub bodies, allow for the easy replacement/swapping of freehub bodies so, for example, you could switch between a Shimano and SRAM XD driver cassette attachment interface. Conversely, because of the ratcheting mechanism, you can also stop pedaling and your wheel will continue to spin freely. When you pedal, energy transfers from your bike’s cranks to the chain and then into the cassette, which spins your rear wheel via the freehub body. The cassette mounts onto the shaft of the freehub body and engages the chain. To do this, these bodies incorporate a ratcheting mechanism along with a shaft that provides a mounting interface for a set of sprockets, better known as a cassette. Freehub bodies are a critical component of your bicycle’s rear hub, providing the conduit between your pedaling power and the force applied to your rear wheel to propel your down the road or trail.
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