I am a frame builder AMA

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deleted

Sorry I meant the sums:

135mm rear +35mm = 170mm
73mm +35mm = 108mm
2.3 * 25.4 = 58mm, 58+ 35mm = 93mm

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Emyr in reply to @deleted

135mm rear +35mm = 170mm

Fatbike dropout is 35mm than MTB.

73mm +35mm = 108mm

Adding 35mm to the MTB BB shell gives you too wide a shell, by 8mm.

2.3 * 25.4 = 58mm, 58+ 35mm = 93mm

Assuming you just moved the stays apart 35mm, you'd only have clearance for 93mm of tyre.

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deleted in reply to @Emyr

Ahhh all clear! I spent an unreasonable amount of time looking at those numbers on sunday afternoon!

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