I have a nice Cro-molly American made Trek from 2000. The components are crap, so I want to upgrade it. The vertical drops are 135mm and the BB is 70.6mm. I want to replace the drive train with a nexus internal geared hub in the rear and a newer 3-chain ring crank in front. Does the nexus come with the anti-rotation washer for vertical drops, or do I have to buy separate? Will the Nexus even fit the bike? Yes, I know that I have to install a chain tension device due to the vertical drops.