I have an old Nishiki road frame from the early 80's (I sure am getting alot of old bike stuff, I should probobly start setting limits ). I know absolutly nothing about this frame, not even the model name. but it does have a decal that says "Nishiki High Carbon Tubing". I'm not familier with all the terminology for steel quality, so is "high carbon" tubing high tensile or cheap chromoly? I was under the impression high tensile steel was low carbon.