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I don’t quite follow this. There’s the cross-section radius and the side-profile radius.
So what does increasing the cross-section radius do to the side-profile radius?
snoops-
I can't quite work out how it works but it does. I resized 650b guards to fit 26x2", fairly straight forward and doesn't take much adjustment of the cross-section to change the radius the correct amount.
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Pushing the cross section in, increases the side profile radius.
I've been fucking around with different sets all this time. Don't know if repeat adjusts will cause issues. But I fit my 650/50mm perfectly around my 700/38 tyres.
moog
Bossman
https://velo-orange.blogspot.com/2017/01/re-radiusing-fenders.html?m=1
Why did I not think of this before... That's my evening sorted.