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@user110028
Not having access to any 650b wheels and tyres I tried to take some measurements using the only known sized wheel I had hanging around, a 26" MTB wheel. So I know that a 25mm wide rim will fit in there but I need to do the maths to see if a 650b with 40mm rubber will go....
This has the potential to be the shortest current project ever and the most futile, so apologies if it ends up not going anywhere...
40mm at the brake bridge...
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