Bike is a 2006 Yamaha Roadstar 1700. Steering head bearings are roller. In the past 18 months, they've been replaced, along with the front wheel bearings and swing arm bearings. Forks have been rebuilt too, using all new seals, etc. Everything was fine until 2 years ago when I took a trip up to Oregon. A week before the trip I had a new tire put on the rear but the shop that mounted the new tire didn't replace the valve stems, like I'd asked, and I got a flat from a leaky valve in the middle of BFE Oregon. I had to leave the bike on the side of the road and hitch a ride, so I wasn't there when the tow truck driver piked it up, but it was clear he'd dropped the bike while loading it in the back of his toy hauler. In addition, he over tightened the tie down straps, bottoming out the forks and damaging the steering head bearings. He brought the bike to a dealership in OR, and when the tech tried to install a new tire, he discovered the rear axle was *bent* because the shop who forget to replace the valve stems also left out the inner wheel spacer. This caused the axle to turn in the frame, frying the wheel bearings and friction welding the axle to the alignment spacer. That's when the rear wheel bearings, spacers, axle, etc. were replaced. The bike has never been the same since and I'm running out of ideas.