Looking at a frame made with thinwall tubing in standard non-oversized diameters. TT 7/4/7, DT 8/5/8, ST 9/6. The OD's would be respectively 25.4, 28.6, 28.6. The builders say the steel will be non-heat-treated. I assume the alloy is at least 4130. My question is, is it acceptable to have such thin tubing walls without a heat-treated, higher strength alloy such as Nivachrome or 853? Seems to me the main risk here is ease of denting the tubes - higher yield strength should absorb more force or impact without yielding.
What do you say?