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TSX Tubing Question

Old 07-14-16, 08:59 PM
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TSX Tubing Question

I always thought that TSX tubing was SLX tubing with the helical reinforcements running the length of the tubing rather than just at the butted ends near the bottom bracket.

But I have recently come across some sale listings that indicate TSX tubing, but the tubing is ovalized in the down tube and seat tube where it runs into the bottom bracket. Was there a TSX tubing variant that had ovalized tubing running to the bottom bracket? Would this ovalized tubing also have the helical reinforcements? I always thought TSX tubing was standard cylindrical sized tubing.

I have seen this on early 90's Bianchi listings specifically. This is that time period when all the oversized, ovalized, multisized tubing started replacing standard sized tubing. Thanks for any info.
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Old 07-15-16, 12:48 PM
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I had a TSX Bianchi, and it also had the ovalized tube where it connected to the BB. I don't think the tube was ovalized from Columbus, it's very easy for the builder to do that. I have seen other TSX frames with standard round tubing.
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Old 07-15-16, 02:24 PM
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My understanding is that Columbus (and Tange) supplied the tubes with oval ends per Bianchi's request. Bianchi had designed a bottom bracket shell with oval collars having the major axes oriented to decrease lateral flex. This was a further development of their Superset technology which they dubbed Superest II and released circa 1991. In some applications the tubes were also thinner gauge and oversize. In the original Superset design, lateral flex at the bottom bracket was decreased by using heavier gauge down tubes and chain stays (eg. SPX down tube and chain stays on an otherwise SLX tubeset).
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