Originally Posted by
cyccommute
There is no rim design that I can think of that would be incompatible with a hub mounted disc brake. The forces on the rim are small. The spokes do most of the work. There are legitimate reasons for not using a disc rim with a rim brake...the sidewalls have been reduced and there is no brake track...but the opposite isn’t true of rim brake rims. Rims for rim brakes tend to be heavier because the brake track adds to the weight but, if anything, that would add strength to the rim, not take it away.
let's see point by point what happens while braking and show me when am i getting it wrong :
- . braking in general uses the fork to slow down the wheel
- . braking power goes from the fork through the wheel to the ground
- . if its a disc brake, braking forces get from the hub, through the spokes to the rim and create pulling forces on the spoke bed
- the path taken by the forces is longer
- braking power creates spoke tension
- momentum also creates tensinon
- . if it's a rim brake, braking forces create tangential compression in the rim (as quoted by Bike Gremlin from jobst brandt's book )
- the path taken by the forces is shorter
- braking power creates compression in the rim
- momentum creates tension in spokes
- therefore, spoke tension is smaller in rim brakes.
- disc brakes require a stronger spoke bed.
can you explain at what point am i missing the wholistic picture of the wheel ?