Originally Posted by
Scooper
Kurt, I don't know the answer to that. I'm pretty sure the P13-9s, which were the only '72 model that the Campy's were an option on, had the brake bridge mounted lower on the seat stays than the P15-9s (remember, the P15s needed fender clearance). So, the Campy rear brakes may have fit OK without a drop bolt. I do suspect anyone trying to mount the early Campy side-pulls on a P15-9 would require a drop bolt because of the higher brake bridge.
Good question. So happens that the '72 all-chrome P-13 presently at Business Cycles happens to have Campag sidepulls - if I recall right - and Mavic tubulars (700C, of course). Might call John up to ask if it indeed has drop bolts.
EDIT: Called him up. No drop bolts. I gather it was only required for the 27" frames, for it is impossible to do without the drop bolt on my 27"-equipped '70.
Originally Posted by
Scooper
There's also the question of whether P13-9 frames built for 27" clincher rims had the brake bridge higher than those built for tubular rims, and I don't know the answer to that one, either.
Well, I can tell you without hesitation that my '70 P-13 (27") and the '72 P-13 (700C) at the shop - regardless of being the same size down the seattube -
are entirely different in dimensions.
Most apparent is the differences between chainstay bridges on the two machines - my '70 is 6cm measured from center of BB to the center of the bridge. The '72, on the other hand, is closer to 5cm, if not less. Not that it particularly matters, but my '61 is 5.5cm. While I haven't measured chainstay or fork length either, I'd venture to say that it is likely shorter then the '70.
-Kurt