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  • If I were to get another GXP crank arm of the same length as a replacement, am I likely to notice any difference in Q-factor etc?

    We don't know how sensitive you are. The change in Q factor is significant, but it's of the same order as switching from road to MTB.

    I'd be surprised if a pedal was properly stuck in a crank that new unless it was either damaged or had been at the bottom of the ocean for a few months.

  • The annoying thing is that it is an XT SPD pedal, so there is no part for a pedal spanner, just an 8mm allen key on the inside.

    I've tried heating it up, as suggested on Sheldon Brown, but to no avail.

    Any suggestions?

  • Any suggestions?

    I had some good success with a bench vice. Clamp the pedal really hard, and then stick in a allen key socket connected to an extension bar, as if you were to try to take the pedal off. Give the back end of the extension bar a good few whacks with a hammer. I found the shock and vibration unbound the pedal.

  • Put the allen key in a vice and lever the crank arm.

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