Yes, in other words OX is heat-treated, AVR isn't.FluffyChicken":3s4g06l5 said:OX is Tange Prestige what AVR is to standard Tange DB
I think.
I'd be slightly surprised if the two frames weigh the same, but nevertheless it is the case that a designer can use the greater strength/weight factor of a heat-treated tubeset to make a stronger bike at the same weight, rather than the alternative of making an equally strong bike at a lighter weight.