Greg,
Personally I don't like to see frames that have been adjusted in the rear. But it probably does not effect the ride or frame integrity if properly done; but it may effect the lifespan of the bike. A frame spread from 120mm to 126mm isn't too bad, 126mm to 130mm is OK, but 120mm to 130mm is a NO NO in my opinion unless the bridges are removed and replaced in the operation.
Look for signs of the resetting. A bulge on the chainstay at the c/s bridge isn't good. Seat stays will be visibly out of line and may look unsightly. If you plan to return the frame to it's original spacing it would be better. The metal has memory and will go back to the original spacing quite naturally. If a stay is bulged you will be stuck with it, but if no damage is visible a resetting of the frame should put everything back in order. Don't forget to realign the dropouts with the Campy "H" tools.
Brian Baylis
Vintage Cycle Studios
El Cajon, CA
(619)449-5977
Dear Listers:
If someone spreads the rear stays on a vintage 60s/70s frame - Columbus tubing - to accommodate a 7/8/9 speed modern cassette, how much is the frame integrity compromised? Assuming it is done 'properly' but a pro bike shop, can one assume the frame will retain its rigidity and 'ride', or is it a terrible idea? I am considering purchasing an old frame built by one of the Italian Masters, and am concerned by this adjustment made by the owner.
Thanks all.
Greg arnold nyc