I think I'm going to order a new steel custom bike and have narrowed it down to a few builders. I want a sport/tour type frame and the ones I've come up with are built by Independent Fabrication, Seven, Waterford, and Rodriquez. IF and Seven choose the tubing for you from the big manufacturers. Waterford uses True Temper OS2 and I can get a Rodriguez in True Temper OX Platinum. Can anyone tell me the difference between OS2 and OX Platinum?