Hello, my friend has a bike with 27,5 tires and it just fits her. We were planning on converting the bike to an Electric. If we buy a rear hub motor and chose to put the 26-inch wheel on. Will that work and can we keep the 27.5-inch wheel on the front?
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firstly youll want you avoid hub motors, and go with a mid drive motor which we promote and are sold here, for a number of reasons - superior torque, speed vs hub motors and performance, ease of install/maintenance are better. generally with bike frames you cant change wheel sizes, but some are compatible, check with the manufacturer first if a mullet setup like you are thinking - 26 rear 27.5 front - is possible.
Sure--to the 27.5 on the front. The hub will work on the back, too. the only caveat being the brakes. Many hub drives can be mounted with discs it that's what you have now. It there are rim brakes, it may be more of a problem. I would recommend disc conversion if you don't have them. The increased weight and power cry out for more braking performance. They are pretty cheap (under $100) and so much better.