kdelong said:
I think that there is not a problem with the frame. By the look of the frame, you may have to use two front brakes instead of a front and a rear brake. The stud for a front brake is longer than on most rear brakes. You want the nut to bottom out in the frame to pull the brake calipers up tight against the frame. This prevents the brakes from rotating freely in the frame. A lot of newer bikes do this.
Alfeng, in case you can't get to the site, this frame doesn't have traditional seat stays. It has a single tube that extends from the seat and then splits into the seat stays. There is no real brake bridge, it has been integrated into the single tube. There is just a hole very near where the seat stays split out fron the single tube.
Thanks. I was able to see a pic with the corrected web site address.
And, as
tafi indicates, it is generally referred to as a
monostay.
Also, as
tafi suggests, drilling should be thought of as a last-resort for those who are NOT
handy.
Now, as to whether the brake bolt/"stud" is longer on a Shimano than a Campagnolo rear caliper -- on a 6500 (Ultegra) rear brake caliper that I have, the brake bolt is about
1 millimeter longer than a Record (pre-Skeleton) rear brake caliper that I have. Probably not enough to make a difference.
Have you [Darren] threaded the recessed nut onto the brake bolt AND held it against the outside of the brake "bridge" of the monostay?
I think I have (encountered) at least 4 different lengths of recessed nuts ...
BUT, I have also encountered recessed nuts whose heads have DIFFERENT diameters ... and,
that may be a partial source of your problem -- that is, the recessed nut is not seating all the way into the rear of the frame's brake hole.
To state what is obvious to many, some FORKS need a longer recessed nut [e.g., Kestrel, Alpha Q (?), etc. ... the appropriately longer recessed nut
comes with those forks] because of the design of the fork's shoulder, and this may be the case with your frame's rear brake hole, too. So, again,
tafi may be on-the-money with his suggestion that you need a longer recessed nut AND/OR that you should contact the seller.
BTW. A longer recessed nut is a lot less expensive than a new group!