Originally Posted by
eastbay71
I wasn't aware that there was that much difference between a 27" wheel and a 700C wheel. Good to know if I want to swap over my Trek on day.
The radial difference between 27" and 700c rims is 4 mm so, if your brake shoes can be lowered that far, the wheel swap is feasible with no brake replacement. I assume your 520 has cantilever brakes so see if they will adjust as needed.
I had an '83 Trek 400 that also came with 27" wheel and long reach (47-57 mm) caliper brakes. The brakes could make the needed adjustment and I successfully fitted 700c wheels to it.