On 06/19/2014 12:11 PM, Hugh Flynn wrote:
531, I believe, describes the cro-moly mixture.
Manganese-molybdenum
However, 531 tubes were offered in different configurations (straight gauge or butted and probably a range of other details).
various wall thicknesses
Since riders didn't always know the configuration differences between two frames that bore the "531" sticker, it would be difficult to determine whether people who rave about 531 (and I am one) are raving about the mixture, the configuration, or both.
The one thing we can be pretty sure of is that they weren't raving about the specifics of the alloy (what you're calling the "mixture").
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