Each mounting plate is effectively a 2.35mm thick spacer. The plates are 1/4" thick but I cut a pocket at the BB so the added width needed at the spindle is 2.35mm per side. Can you measure the outside face to outside face of the PF adapters? This would be the effective BB width I need to space the plates to (with the spacers). I'm sure the Echo cranks give enough clearance; middle chainline to outside motor is 150mm, the motor chainline is 20mm outboard of the BB face.
Ecyclist, 20W for 4600RPM is pretty f'n ridiculous. I've been following your thread, nice work. I've put some big bearings in the Tangent, they may be overkill, but I gotta flog this chassis
Steel frame, high pivot, progressive smashness. The frame is a Peregrine (http://www.peregrineindustry.com/
), Maintou Dorado forks, Saint stoppers, 26" wheels, Chris King hubs. Bike is setup single speed, 16/24t motor/crank so 400RPM at the crankset and the wheel (32t/32t crank/wheel), 31mph and will lift the front at any point on the way there. The frame is stout, look at the wide stance of the swingarms. No noticeable flex at 7.5kW. Waiting for Seattle to finish draining then trail smash.