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Old 05-29-09, 10:16 AM   #1
mconlonx 
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stripped bottom bracket

We have a cannondale furio in the shop with a stripped BB. I remember Mavic made a BB with a chamfered edge where you'd have to machine the shell to fit it, but it was a last ditch solution when threads stripped. Anything like that around today? Any other solutions to fixing stripped BB threads?
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Old 05-29-09, 07:10 PM   #2
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YST makes similar no-thread bottom brackets. It's not clear if chamfering the shell is needed. They are cheap and have a medicre reputation for durability. Here is one reference:
http://www.biketoolsetc.com/index.cg...=YS-BB99368110

Another approach is to ream the damaged English threads and retap the shell for Italian threads. You will need a 2 mm spacer to use an Italian bb but it will save theframe.
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Old 05-30-09, 08:15 AM   #3
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Originally Posted by HillRider View Post
YST makes similar no-thread bottom brackets. It's not clear if chamfering the shell is needed. They are cheap and have a medicre reputation for durability. Here is one reference:
http://www.biketoolsetc.com/index.cg...=YS-BB99368110

Another approach is to ream the damaged English threads and retap the shell for Italian threads. You will need a 2 mm spacer to use an Italian bb but it will save theframe.
Assuming a cup-and-cone bottom bracket, you can just buy the Italian cups and use your present spindle and avoid the need for any spacer.
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Old 05-30-09, 08:16 AM   #4
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Originally Posted by HillRider View Post
YST makes similar no-thread bottom brackets. It's not clear if chamfering the shell is needed. They are cheap and have a medicre reputation for durability. Here is one reference:
http://www.biketoolsetc.com/index.cg...=YS-BB99368110

Another approach is to ream the damaged English threads and retap the shell for Italian threads. You will need a 2 mm spacer to use an Italian bb but it will save theframe.
I'd suggest doing hillriders second suggestion, if the shop has the tools and experience to do it properly. I think you were being a little bit generous with the "mediocre quality", it's more like "ultra garbage".
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Old 05-30-09, 08:17 AM   #5
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Assuming a cup-and-cone bottom bracket, you can just buy the Italian cups and use your present spindle and avoid the need for any spacer.
Come on. Cannondale furio, modern, recent, no chance that isn't cartridge.
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Old 05-31-09, 07:52 AM   #6
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So where Italian is at 36mm v. ISO at 1.37, that .04 difference is enough for full depth of thread?

Cool. Cannondale did not want to talk to a non C'dale dealer about a warranty issue, so we pointed the customer toward the correct local shop. I'll offer up the Ital BB solution if he finds no love with C'dale warranty coverage.
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Old 05-31-09, 08:57 AM   #7
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You could drill and tap 8 holes in the circumference of the BB shell (4 on each side). Then, a sealed bottom bracket unit can be inserted and held in by 8 allen head screws.
I did a conversion like this on a Lambert (the old English bike with press fit sealed BB bearings?). Couldn't find replacement bearings and spindle, so had to adapt the frame to use something obtainable. It then allowed me to install a regular crankset, and I was able to get the bike together and rideable.
As this was done on a classic bike I wouldn't recommend it for every stripped BB job. I really wanted to get the Lambert running, and to prove to myself this kind of adaptation worked. It was a labor of love, took more time than it was probably worth. But it functioned just fine. And only an observant history buff would recognize the modification.
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Old 05-31-09, 08:55 PM   #8
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Come on. Cannondale furio, modern, recent, no chance that isn't cartridge.
I'll take your word for that. I don't know Cannondale's product line at all.
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