Others who know more will be along soon but this bike sometimes does a thing called the "ball bearing dance."It's terribly unsettling. The C-14 doesn't do it. You can probably search and find it. I searched for that phrase "ball bearing dance" and got 11 threads. Start there.
The C-10 was designed to run radials, so that's probably not it. My C-10 would get squirrely if the back shock air fell way down low. I always ran it about 40# as I recall and had the rebound stick (or whatever you call that on the right side under the side cover pulled out to position #4. Check your tire air pressures, especially the back. This bike seems particularly sensitive to things being out of adjustment in the back, but that it feel like the problem is in the front.
Welcome BTW Eric. Where are you located? There are COGgers all around and there's an RTE/Wrench session tomorrow in Mooresville NC. If you're close, take the bike and get some expert opinion. Well, SOME opinions.....
