Re: clutch is tightening after a ride
The bearing is important. It is the only thing in there that prevents the release "bucking bar" from rotating and grinding up the whole release mechanism assembly.
Another thing that could be causing the adjustment to go out of whack is that the clutch cable is stretching.
This is normal for any cable but the cheap quality ones do it more that good quality ones. They all stretch a bit at first until they settle in to a working length then mostly stay at that length for the rest of their working life span.
What cable are you using?
Also, is the cable end ferrule slipping on the cable?
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