I found a 50mm front brake and a 49mm back brake and tried them out with both shoes pushed all the way down.
The 50mm front brake fitted pretty much exactly, the 49mm back brake fitted with the shoes protruding very slightly over the rim.
Because of the headaches I've had with finding brakes for my current bike, I'd rather have a bit of leeway either side of 50mm when buying a brake. But since 50mm seems to be the right size, I could probably go for a brake with 50mm max reach.
I found a 50mm front brake and a 49mm back brake and tried them out with both shoes pushed all the way down.
The 50mm front brake fitted pretty much exactly, the 49mm back brake fitted with the shoes protruding very slightly over the rim.
Because of the headaches I've had with finding brakes for my current bike, I'd rather have a bit of leeway either side of 50mm when buying a brake. But since 50mm seems to be the right size, I could probably go for a brake with 50mm max reach.