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snottyotter
Adding to that, excuse me if I repeat everything. Mtb is backwards compatible up to 9-speed. Road is backwards compatible up to 10-speed. Road up to 10-speed is cross-compatible with mtb up to 9-speed. Above there, the shift ratios are different.
Am I also right in saying they altered the 10-speed shift ratio recently, so there’s an additional curveball to watch out for?