I got a new cassette and chain. The XT cassette rivets interfered with the spokes on the ZTR race 29 wheelset. I noticed that the old XT cassette (also 770) had much shorter rivets. So, 5 minutes at the grinder, the wheels are happy again. I could not, however, make my shifting work well. Things are just not quite ok in that department.
Taking a lesson learned from last race, I'm bringing a spare wheelset with 29 X 1.9" tires. If the sport guys are coming off the course with lots of mud on them, the narrow tires are going on. Comaring the wheels, the ZTRs are waaaay lighter than my old Bontrager Rhythm Elite set. Luckily, the brake rotors line right up, so no adjustment will be necessary upon switching wheels.
Check out my new ass-kicking Bontrager Home Wrench repair stand:
Anybody want to buy a fishtank?