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@gbj_tester
Re: crank lengths
Whatever Burrows and Obree say, the actual science says crank length doesn't matter, in the sense that it has no measurable effect on power output or biomechanical efficiency.
If it were actually important, do you suppose that manufacturers would stay in business while offering such a narrow range of lengths? Few crank models are available with more than 10% difference between longest and shortest, even though riders vary in limb length by much more than this.