how do you brace the frame???...and what is the benefit of tapered neck bearings??
Usually you brace a frame by welding in more tubes.
Tapered bearings are more ridgid and are far less likely to get pits that make the steering notchy. They also produce a little more resistance to help dampen head shake. Some people say it gives less "feedback" in the steering so some stay away from them. I really like the fact that they are very low-maintenance once they are in.
