Originally Posted by seely
Surly's are all double butted 4130--they used to be Reynolds 631, but they had more frames break and the 631 was the same weight as the 4130 they use.
sorry to bring this thread back from the dead....but come on! i thought reynolds 631 was much stronger than normal 4130 especially after brazing/welding. sorry if this is incorrect, but isn't 631 an air hardening steel that actually strengthens at the welds. true temper makes some really strong 4130, but the surly is made of "surly 4130". unless someone can legitimately tell me that surly 4130 is as strong or nearly as strong as true temper 4130, i have to believe that replacing reynolds 631 with surly 4130 was a financial decision, not a decision based on frames breaking. okay...this is where everyone comes in and tells me how wrong i am......