Quote:
Originally Posted by GregL
One concern is the change in braking forces as they are transmitted to the frame. I haven't conducted any modeling of the forces involved, but anecdotally would be concerned that the headtube/toptube/downtube junctions could suffer stresses beyond their original design.
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If you did model it, you'd find that the rim and disc brake bikes trasmitted exactly the same forces to the frame. The forces within the fork/wheel/caliper system will be different for the two kinds of brakes, but the forces between the fork and frame (which are external to the wheel/caliper system) are the same.
You don't need a complex analysis to know this, you just need to look at the locations that the forces get transferred into and out of the fork/wheel. Forces are transmitted to the wheel/fork from ground at the bottom of the wheel; forces are transmitted from the wheel/fork to the frame at the headset bearings. For the same force applied by the ground to the bottom of the wheel, the same forces will be transmitted to the frame at the headset bearings. What's going on between them won't change the forces transmitted from ground to frame.