One issue with mine (which started as an aluminum MTB) was the chain stays were too splayed behind the BB, so the TS gear case hit. I had to bash the drive side chain stay in about 1/2 way to take the pressure off the gear case. I'm not worried about failure as there is a bridge welded across the chain stays just behind where I "narrowed" the tubing. It'll transfer almost all the load around the system. The bike will not be doing any big drops anymore. It's just an errand bike or e-cruiser from now on