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Bottom bracket shell failure question
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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Bottom bracket shell failure question
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Bottom bracket shell failure question
wrote in message
ups.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 |
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Bottom bracket shell failure question
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 wrote in message ups.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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