I mostly used the AE 87t spur - its wider so even if you don't get full contact because of a short motor shaft you still have a decent amount. I found the AE spurs lasted better also.
But no - generally I found I could run my favorite EDIT pinions without problems or poor contact. I've not tried an lrp x12 so that might be a little shorter than most, I'm not sure. Get a AE 87t tho!
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