I have a 2001 with 0.91" lug and I run 1.25" with no problem ever in 2000 miles. My dad has a 2002 with the 1.25" lug track and he went and bought 1.625" studs! I thought he was crazy to put that long of a stud in. Well, I put them in and he hasn't had any problems either. We just got back from the U.P. last week. The 1.25" tracks have thicker rubber between the windows for more tunnel protection. They sure put a lot more room in there than the older sleds too.