I had only 4 races on this mower and 3 of them with stock timing on flywheel. I was running turf masters different kinda tire pattern. After the race when i turned up the timing on flywheel to 3rd mark. I notice my turf tire was almost balled. In the race i was just spinning the tires basicly sliding for 4 laps into the race then spinned out in the straight away and then my chain poped off. I was surprised i was in 1st place and 5 tractor lenghts ahead of anyone until I spinned out, So i was wondering if the D12 tires would last longer then turf master tires.