So I got this Miele Volta roadie off of e-Bay, and the frame is made from Tange Infinity CroMo double-butten tubing. With most infinity frames, is the whole frame made from this tubing, or did manufacturers cheat with hi-tensile in the rear triangle?

The reason I ask is to ascertain where the damn weight is coming from! Miele's aren't VLWs by any stretch of the imagination, but the previous Miele Latina Road Issue I had until the frame broke was made from Columbus SL, and I don't remember it being nearly this heavy. I assume Infinity and SL are similar in weight...