Would the 700c 35mm SKS chromoplastics work over a 650b wheelset with 38mm tyre? I can't get my head around it.
yes
Sounds like you'd get a lot of side spray. 45mm guards for 38 mm tyres sounds more like it. Length wise you'd be ok as the wheel is smaller than what the guards are designed for.
@seager started
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Would the 700c 35mm SKS chromoplastics work over a 650b wheelset with 38mm tyre? I can't get my head around it.