Power Meters / Powermeters (SRM, Powertap, Quarq, Ergomo, Vector, Stages, power2max, P2M, 4iii, InPower, Cinch)

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gbj_tester in reply to @Hovis

Why would the recess stop them working?

It buggers up the chain line becasue the P2M spider sits on a bit of chainring which is supposed to clear the spider on the OE cranks.

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suggs in reply to @gbj_tester

Actually it's worse than that. The rings don't sit flush against the p2m, because they're machined for a spider with arms rather than a full circle like the p2m. When you tighten them down it warps the rings. Hard to describe so here's a picture that might help.

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