Does anyone out there know how to measure brake shoe diameter? I'm trying to find rear shoes for the yamoto 50 we have. I have tried a local dealer and sent raceway a message with no luck. EBC brakes has a very good online catalog that lists all the shoes they carry by size, diameter x width. The width is easy. The lining is 19.25mm so a 20mm width will be fine. Not sure how to figure out the diameter. The catalog contains a chart that can be used but no instructions on how to use it.