dfar wrote:hjns wrote:dfar wrote:On my other motor I run regen braking so I don't use a back brake caliper so no worries about clearance there.
Hmm. I use regen AND a disc brake. I find that my regen braking just does not cut it in case of an emergency brake. In such a case, I want both my front and rear hydraulic calipers to be fully engaged in providing the maximum braking without blocking.
kids this is good advice,
It depends on the rig. I run regen as the only rear brake on my SuperV, and at 5.5kw peak braking it test the limits of traction. The only time I miss a rear mechanical brake on that bike is at very low speeds where there is no regen braking. On my cargo bike I run throttle activated regen with a very gentle stopping force, so yes that bike requires a rear brake.