I am a frame builder AMA

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Emyr in reply to @rj

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

So stays designed for 2.3"s on a 73mm shell will need to angle in more to fit a 100mm shell, but wouldn't have the space for 4.0" even at the design angles.

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deleted in reply to @Emyr

What are the numbers? Can't get my head around them...

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Emyr in reply to @deleted

Fatbike would be 100mm or 120mm BSA shell, with OLD of 170 or 190mm for QR, 177 or 197 for thruaxle. The wider spec tends to be for ~5" tyres, but there are plenty of frames which use the 190 rear with a 100mm BB.
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Emyr in reply to @deleted

And the other numbers were 73mm BB, 135mm OLD and 2.3" tyre width, for normal MTBs.

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