I think the problem is you're trying to use way more modern rims than the frame was made for. The latest that frame could have been built is 2002 and you wouldn't find rims with wider than 15mm internal then, your 303's have a 17mm internal and bulge out under the brake track.
I think the problem is you're trying to use way more modern rims than the frame was made for. The latest that frame could have been built is 2002 and you wouldn't find rims with wider than 15mm internal then, your 303's have a 17mm internal and bulge out under the brake track.