154" x 2.5" no belt problems so far after 540km. Belt deflection and chain tension have been adjusted twice to meet spec along with the sled being de-foamed.
I've rode 250km with my 850 and have had no issues. THIS THING PULLS HARD!!!! Coolant bottle was modified a long with the removal of all my foam and felt. Can't wait to get this sled out to west after Christmas.