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densmall wrote:What is the difference between a 650B whee land a 27.5 inch wheel.
They are both the same 584mm ETRTO diameter. The only difference is that wheels labelled 27.5" are likely, but not certain, to have wider rims. (The same applies to 700C & 29" - the same 622mm ETRTO diameter).
Generally but somewhat confused by the gravel/all road bike trend. My Kona Sutra runs 23mm wide rims, one set of wheels says "29er" on the rims but my tyres all say 700C on the sides.