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@gbj_tester
If we take your statement at face value, you have made the case for 650b. If we assume that on a graph of x=wheel diameter and y=arbitrary measure of "faster" and f(x)=y, you're saying f(26)=f(29). Taking it as read that f(24)f(26) and obviously also f(27.5)>f(29)
tl;dr
If 26 and 29 are equally fast and bigger or smaller wheels are slower, 27.5 is almost certainly faster than either 26 or 29.