Originally Posted by
kalash74
I'm confused on one point, though. You mentioned that you adapted 700C fenders for use with your 26" Rat Trap tires. How did you change the overall diameter so that it matched the curve for the 26" tires?
I don't have the math to explain this with the correct terminology, but trust me, it happens automatically.
The fender is basically an incomplete torus:
So in this diagram you see there's two diameters; applied to the 63 mm 700c fenders, the 700c diameter is drawn in blue, the 63 mm diameter is drawn in red. If you stretch out the former, the latter gets narrower; if you stretch out the latter, the former gets smaller. Look at the two before and after photos again, and you'll see the differences.