Originally Posted by
thumpism
If you already have brake calipers and they reach the 27" rims, it is possible to file the slots in the calipers to be longer so you can slide the brake pads further down so they will reach 700C rims. I did this on my Batavus. Eyeball the calipers carefully and measure to determine if you can remove about half the meat remaining.
+ 1 on this. I recently had to file the slots on centerpull brakes to make them work with 700c wheels for a bike designed for 27 inch wheels.