Back in the day, we rode bikes made of steel tubes that generally came from one of two companies—Reynolds or Columbus. Reynold’s mainstay tubing was “531,” which supposedly referred to the proportions of alloying materials in the steel; Columbus’ was “SL,” but “SLX” was their fancy tubing, with helical reinforcements in the butting areas.
This is in the style of an old Reynolds 531 tubing label, typically found on the seat tube just under the seat lug.
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