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Do I need to file before final fitting or can I get away with as-is?

Like a few others on the forum I just picked up this rear hub. Bafang G020.250.DC 13. I'm trying to figure out some basic numbers regarding speed. Purely interested in the numbers. I found an equation on YouTube - RPM x Wheel Size x 0.003 I assume you use the Load RPM and not the No Load...

I've got a Bafang G020.250.D/DC 13 pictured below and a 13ah 48V battery. Bike is a Carrera with Hydraulics. I believe the 2nd kit with the hydraulic break sensor is what I need. KT-17A controller. Can anyone confirm this is what I need? Can't find any UK suppliers without buying all the parts...

Hi guys, great forum! I'm looking for a cheap e-bike option to get back into cycling. The plan is to do little day trips around London with my gf who just got a VanMoof. It won't be for commuting but it would be nice if I could swap some journeys. For reference I'm 5'7 and 140lbs. I would...