When I push up on the underside, below the rear edge of the chain slider, it just touches the slider at the rear edge. I set the free play to 1.250" (aprox. 32 mm) when the bike was new, and then re-set it to the same spec when I installed the 13T at 2500 miles. Now 9000+ miles on the bike and I haven't had to re-adjust it at all. I run the chain free play on my XR's to the larger side of the spec as well... seems to result in longer chain & sprocket life.Does yours hit the swingarm when you lift it up? I put the 13T on mine, and adjusted it to ~30mm. Anything higher and it seems to hit the swingarm when I lift it up, feels a bit too loose. So aimed for 25-30mm.