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Thrust-
Well bottom bracket was the most obvious and immediate. The use of suspension forks on Adroits and Attitudes ( and Mantras, which were originally designed to work with a rigid fork)
I know Klein used them before trek but the famous rigid fork vanished once the company was taken over
Then MC3, and the use of carbon in the rear stays on Quantum (Q pro) models.
Trek also brought in models not ever intended ( the Navigator for example) and used the Klein branding and tooling. A nice bike but forced on the company.
I think yours is one of the best road race bikes ever made. I sold mine on here, and still regret it. I still have a few but not a pro.
adroit
Klein made them, but Klein was owned by Trek (from 1995) so some "later" Kleins had MC2 (and usually threaded BB shells)
They were still made in Chehalis, but Trek forced a lot of design compromises.