Trying to put a set of dual pivot calipers on a 1989 Trek 420. It's an odd year that I'm going to call "transitional".

Both brakes are 47-57mm reach (single pivot). The front brake is recessed, and the rear brake is nutted.

So just about any modern caliper will fit the front, but I'm having trouble finding something for the rear.

Shimano makes the R450 and the R650, both long reach, but both are recessed. I think with a little work I can drill out one side of the brake bridge to fit the allen nut thinger on the brake..

Thoughts?



Current rear: