531 500

[supermario]

What is the history behind these and what do they mean on old bikes

 

[Guitar106Music]

Hi, I'd guess you're having a laugh, however on the off chance you're not.

531 is a type of reynolds tubing, it comes in various types, 531ST (touring) 531P (Professional) etc, etc.

500, not sure what this is, however there is a type of Reynolds tubing called 501.

Stu

 

[David B]

Hi, I'd guess you're having a laugh, however on the off chance you're not.

531 is a type of reynolds tubing, it comes in various types, 531ST (touring) 531P (Professional) etc, etc.

500, not sure what this is, however there is a type of Reynolds tubing called 501.

Stu

500 is just plain-gauge (i.e. no butting at the ends & uniform inside diameter throughout) 501. Both are seamed (i.e. rolled from plate and welded at the join) rather than seamless (drawn from solid steel billet) tubing, using a chrome-molybdenum alloy steel. As against manganese-molybdenum steel used in 531 tubes (chrome-molybdenum takes better to the use of welded rather than brazed frame building methods).

David

 

[GasPipeWarrior]

What is the history behind these and what do they mean on old bikes

From Wikipedia: Reynolds Cycle Technology