I had to change my pressfit bearings again and still do dot understand how that system works.
In the old days with cone-bearings the axle position was defined radially AND axially by the bearings.
In the system with pressfit bearings where you enter the axle afterwards the axle position is only defined by the bearings in radial direction.
Axially it is defined by the cranks touching a spacer. In my case, it is a plastic spacer (one left and one right).
There is thus a friction between the cranks and this spacer. If you pedal for example hard on the right side, it seems to me that the crank with the axle is pushed inwardly to the left against this spacer, causing friction.
This friction must be neglegible because otherwise this construction would not exist. Is it really neglegible? Does the axle center itself during pedalling such that the cranks hardly rub against the spacers? I never understood this. Thoughts?
In the old days with cone-bearings the axle position was defined radially AND axially by the bearings.
In the system with pressfit bearings where you enter the axle afterwards the axle position is only defined by the bearings in radial direction.
Axially it is defined by the cranks touching a spacer. In my case, it is a plastic spacer (one left and one right).
There is thus a friction between the cranks and this spacer. If you pedal for example hard on the right side, it seems to me that the crank with the axle is pushed inwardly to the left against this spacer, causing friction.
This friction must be neglegible because otherwise this construction would not exist. Is it really neglegible? Does the axle center itself during pedalling such that the cranks hardly rub against the spacers? I never understood this. Thoughts?
Last edited by:
longtrousers: May 21, 20 4:50