The typical free-coaster works off of a screw mechanism.
The driver will have a screw shape coming off of it into the hub. And the clutch will have it on the inside, so that when the driver is turned, the clutch will move in toward the diver.
But what if the clutch just moves forward with the driver(you might ask)? Well, that is the work of the resistance. In most coasters this resistance is created by a spring running along the axle. The spring will prevent the clutch from moving forward easily with the driver, so the threads on the driver will pull the clutch in toward itself.
As it moves toward the driver, ridges on the clutch will come into contact with the hub shell and turn it with the whole mechanism. The harder you crank down the more the clutch will push into the shell and pull it forward.
When you stop pedalling, the forward movement of the hub shell will push the clutch slightly back off of the driver threads and disengage the hub. In this way, the clutch never moves unless the driver moves, so the hub shell is free to move in either direction with out binding.
Slack
Slack is the rotational gap between the clutch being fully disengaged and fully engaged, measured in fractions of a turn either at the crank or rear sprocket. For example, a typical cassette might take up to a 1/20th of a revolution to engage, while a typical coaster might take 1/8th of a revolution.
Maintenance
Freecoasters NEED to be taken care of and taken care of properly if you fail to do this you will be out money and you have no one to blame but yourself.
Good Run Throughs Of How To Take Apart A Freecoaster
Angular contact bearings are ideally suited for high speed applications where both axial and radial loads are to be supported, and where system rigidity requires preloading. The design inherently limits thrust loads to one direction, and are generally used in pairs or sets. Radial load support is limited and occurs only when thrust loads are present or preload is used.
Angular contact ball bearings have raceways in the inner and outer rings that are displaced with respect to each other in the direction of the bearing axis. This means that they are designed to accommodate combined loads, i.e. simultaneously acting radial and axial loads.
The axial load carrying capacity of angular contact ball bearings increases with increasing contact angle. The contact angle α is defined as the angle between the line joining the points of contact of the ball and the raceways in the radial plane, along which the load is transmitted from one raceway to another, and a line perpendicular to the bearing axis.
I know you too probably talked about this... but your whole thread is now gone... You don't have a sticky anymore and Fufa didn't give you any credit in this one...
I know you too probably talked about this... but your whole thread is now gone... You don't have a sticky anymore and Fufa didn't give you any credit in this one...
yes he did...lets keep it clean...and no we never talked about it...
Well coming from mountain biking, I just learned a lot. I sort of get the main differences but don't fully understand yet.
Can someone setup a simple comparison? I'm not looking for an in depth essay here, but just an idea of the differences and advantages of both. I'm considering getting a BMX and I like to know everything about my bikes... It would be appreciated.