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Old 07-16-07, 06:17 PM   #1
Carbon Based
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Integrated seat post clamp- broken! Solutions?

I was unscrewing the bolt holding the seatpost in on my newest acquisition (late 60s Bianchi), when one of the little tabs the bolt runs through snapped right off. It looks like the bolt had been way overtightened, weakening both the clamp and the bolt (the bolt was curved!). So my question is whether there is some workaround to repair this without just welding the piece back on. I looked at just putting a regular seatpost clamp on it, but it appears that the seat tube may be too short in relation to the top tube for a clamp to hold. There's less than 5mm from the top of the seat tube to where the curve of the lug begins.

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The problem:

Too little space for a clamp?:
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Old 07-16-07, 06:42 PM   #2
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You ought to try a seatpost clamp first. Will be your cheapest and easiest option.
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Old 07-16-07, 10:08 PM   #3
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Anyone with decent brazing skills can fix that. Look up some local welders and see if the can braze that back on.

Since you are in Scottsdale, make a trip down to Tempe. www.mintcycles.com

Call up Chris and he'll fix you up.
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Old 07-17-07, 02:32 AM   #4
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Quote:
Originally Posted by nitropowered
Anyone with decent brazing skills can fix that. Look up some local welders and see if the can braze that back on.

Since you are in Scottsdale, make a trip down to Tempe. www.mintcycles.com

Call up Chris and he'll fix you up.
While I don't know of this builder personally, give him a shot first. Worst case is that they have to braze on a new seat tube lug. This is why steel is still a good choice for a long term bike. It can be repaired.

After rereading what you said about the lug itself, you might want to check the seat tube diameter. If it was tightened that much sounds like the seatpost was too small. Repeated tightening would cause the lug to crack like that.
Good luck

Tim

Last edited by cs1; 07-17-07 at 02:43 AM.
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Old 07-17-07, 06:33 AM   #5
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Another thought would be to grind off the other ear as well and fit a collar-style seatpost clamp.
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