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Crimping chainstays on an already-assembled bike

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Crimping chainstays on an already-assembled bike

Old 07-17-13, 07:49 AM
  #1  
David Tollefson
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Crimping chainstays on an already-assembled bike

Curious on the viability of crimping chainstays to gain more tire clearance on an already-made frame.

I have a Paul Barkley Softirde road bike that I eventually want to modify for disc brakes, and want to up the tire size. Right now a 28 is the max (clearance at the brake and "seat tube"). I figure I can position the wheel farther aft to get the clearance at the (current) brake and "seat tube" when I put on different disc-ready dropouts, but crimping the chainstays may be needed as well.

Recommended? Or am I courting disaster?
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Old 07-17-13, 09:55 AM
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cycle_maven
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I've done it with no ill effects, so far. I used a losenge- shaped piece of steel brazed to a flat plate for the crimping die, and a little 3" vice as the press, with a piece of radiused plastic block to keep the other side of the tube from getting marred. I used a little patch of leather to keep the paint from getting marred on the crimp side.

The bike was a 1975 Raleigh Super Course Mark II, and the wheel was CR-18 rim with a 35 mm 700C tire.
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Old 07-17-13, 10:27 AM
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unterhausen
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I just saw a picture of someone using a large set of vise grips for this application. Waterford maybe? On a steel bike, there is no issue with crimping. You probably want to set it up so that your new crimp takes the old crimp into account
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Old 07-17-13, 11:16 AM
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busdriver1959
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That was Serotta. It was in Friday Night Lights #225 over at Velocipede Salon if you want to see their technique.
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Old 07-17-13, 05:16 PM
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BenCooper
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I use a device I call the Dingus, made out of a ball joint splitter.
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