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Re: Bottom bracket shell failure question
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GYXU > Cycling > Re: Bottom bracket shell failure question 11 April 2005 08:56:17

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Re: Bottom bracket shell failure question

David White 10 April 2005 18:36:54
 A good question for the group rec.bicycles.tech, I'd think.

WILS3824@BELLSOUTH.­NET wrote:> I just bought a vintage Torpado Superlight frame from about 1985.> This frame is made of Columbus SLX tubing and was their top of the line> frame from that time. The frame is in very nice condition with no rust> and a clean bottom bracket shell. The bottom bracket shell is an> english threaded Cinelli. Torpado cut a decorative "T" in the bottom> bracket shell that measures about 2cm X 2cm. When my LBS professional> looked the frame over, he was critical of the cutout. He told me that> Torpado went out of business because of bottom bracket frame failures.> He felt that the cutout in the bottom of the shell might cause failure> if standing on the pedals. Does anyone have any experience with this> issue? Especially with Torpadoes? Another employee felt that this issue> diminished with the use of a modern cartridge bottom bracket. Any> opinions from the group would be appreciated. Thanks in advance.>
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Ground Zero 11 April 2005 00:29:45 permanent link ]
 <WILS3824@BELLSOUTH.­NET> wrote in message
news:1113141453.717­585.69560@f14g2000cw­b.googlegroups.com..­.> I just bought a vintage Torpado Superlight frame from about 1985.> This frame is made of Columbus SLX tubing and was their top of the line> frame from that time. The frame is in very nice condition with no rust> and a clean bottom bracket shell. The bottom bracket shell is an> english threaded Cinelli. Torpado cut a decorative "T" in the bottom> bracket shell that measures about 2cm X 2cm. When my LBS professional> looked the frame over, he was critical of the cutout. He told me that> Torpado went out of business because of bottom bracket frame failures.> He felt that the cutout in the bottom of the shell might cause failure> if standing on the pedals. Does anyone have any experience with this> issue? Especially with Torpadoes? Another employee felt that this issue> diminished with the use of a modern cartridge bottom bracket. Any> opinions from the group would be appreciated. Thanks in advance.>

I question the bike shop's knowledge of Torpado and why it is no longer in
business. But that is another topic....

Usually, a small cut-out in the bottom bracket shell shouldn't cause frame
failure. Many frames have a small hole drilled in the shell to aid in the
removal of moisture from inside the frame tubes. Plus, if the cut-out is
centered on the shell, it is in a low stress position - the greatest stress
is concentrated at the threaded ends of the shell.

The only concern I see is the potential for stress fractures if the cut-out
is angular.. easily rectified by rounding the corners with a small file.

Stuart Winsor
Ground Zero Cycles
sales@gdzer0.com


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Firewolf65 11 April 2005 08:56:17 permanent link ]
 Back in day many things were tried to lose weight on the bikes, and bottom
brackets were one spot, I we member hearing that they used to drill out the
bracket and use soup cans in order to lighten. But the LBS was right, in
questioning the BB shell. I would because of year and lack of staying power
of the manufacturer.

I would think long and hard, if it was free then go for it, otherwise?

If you do decide to take it, I agree with Ground Zero on the filing.

Good luck
<WILS3824@BELLSOUTH­.NET> wrote in message
news:1113141453.717­585.69560@f14g2000cw­b.googlegroups.com..­.>I just bought a vintage Torpado Superlight frame from about 1985.> This frame is made of Columbus SLX tubing and was their top of the line> frame from that time. The frame is in very nice condition with no rust> and a clean bottom bracket shell. The bottom bracket shell is an> english threaded Cinelli. Torpado cut a decorative "T" in the bottom> bracket shell that measures about 2cm X 2cm. When my LBS professional> looked the frame over, he was critical of the cutout. He told me that> Torpado went out of business because of bottom bracket frame failures.> He felt that the cutout in the bottom of the shell might cause failure> if standing on the pedals. Does anyone have any experience with this> issue? Especially with Torpadoes? Another employee felt that this issue> diminished with the use of a modern cartridge bottom bracket. Any> opinions from the group would be appreciated. Thanks in advance.>


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GYXU > Cycling > Re: Bottom bracket shell failure question 11 April 2005 08:56:17

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