So yesterday I decided to do a fresh experiment regarding the rear tire on my '17 Factory 250, which came with the best trials tires, the Michelin so called Lite tires. My rear was rounded in one direction, so should I turn it around or fit the Dunlop 803GP languishing all year in the corner of the shop? I decided on the latter. The reason? The stupid Michelin rear is $180 from my cheapest source!! I weighed both tires. The new Dunlop is 12.3 pounds, and the used Michelin is heavier at 12.5 pounds. So much for marketing BS. The profile is more rounded on the Michelin uninflated, but that seems to reverse when inflated. The carcass is way more flexible on the Michelin, especially at the intersection between the sidewall and outer knobbies. How much of that is broken in versus new? First test ride I used 4.0 psi in the Dunlop instead of my usual 4.5 psi in the X-Lite. The rear still felt a little butt high with the Dunlop, and traction on the new Dunlop would break break earlier than the used, rounded Michelin. I know I will have to run the Dunlop at lower pressure, at 3-1/2 psi or even 3.0 psi for equivalent squat and improved traction. Going this weekend to compete. That should break in the new tire carcass. Just hope the tire doesn't cost me the potential for a win! In the last two events, the spread between first and second overall was 0 and 2 points!! It'd bad to end up 2nd place - if I'm able to ride sharp - from one rear tire slip :-0 If I get the Dunlop 803GP to work fine, great! I'd rather not reward Michelin's effort to extinct itself with ridiculous pricing in the aftermarket.