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2 dropouts will probably be enough.
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which thread pitch would be best to choose?
Whichever your frame builder can get. If you're worried, get a couple of spare through bolts now, although I suspect that it's the OLN dimension which will trip up future proofing rather than the thread pitch.
If I'm designing for bikes with a free hand, I prefer 1.0mm pitch for everything from M6 up.
snottyotter
gbj_tester
@PhilDAS
If speccing a frame with 12mm rear dropouts, which thread pitch would be best to choose?
Or which is the most common/likely to last?
I can see 1.0, 1.5, 1.75mm at least.