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Currently running 650x38 with the fenders. This frame was able to clear 700x30 before I did the conversion. I had to crimp the chainstays a bit for the 38s to fit. I have a tool that I had a machinist make for me. Clearance is tight with fork, and I had to trim the fender for it to fit, but it works. If 25 is max currently on your Colnago, I imagine you may only be able to fit 650x35s without fenders.
tektro r559, the people’s brake