Finally got some trail time with the JJ’s. First comparison is eyeball-sizing them. The JJ’s mounted on 80mm Jackalope rims sit wider in the rear of my frame than a Bud on 80mm Specialized BAD’s. However the Bud’s are visibly ~0.50” taller(?). Frame clearance is fine, the JJ is just much closer to the chain, in the lowest gear, than the Bud.
On the trail, they do roll lighter. I wasn’t sure how much they would squish, so I ran them at 7psi. I’m big, 6’4”/230 and they still felt a little firm at that pressure and would rebound a little too much, but no real chance of rim strikes. They did fine traction-wise, but any tire probably would have. I’ll have to play with pressure a little, but today was fun and I bombed down a few rooty sections a little faster than I normally would have (at softer pressure) for fear of rim strikes.