Radial location of the studs relative to the axle will vary by about 31mm between MTB 26" and 29er, with the latter being at about 285mm
These are about 240 so I'm going to say its 26". Thanks!
@Belagerent started
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Radial location of the studs relative to the axle will vary by about 31mm between MTB 26" and 29er, with the latter being at about 285mm