Not a technical issue but wanted to share what I can only describe as a fluke. About 20 minutes into mowing with my TO-30 I ran over a white tail 4 point antler that had fallen upright. It fit perfectly over my right rear wheel and the 2.5 inch "spikehorn" went right between the lugs and into the tire and tube. Ruined my day! It got me wondering what other folks might have run over that just managed to line right up and cause this type of grief. To make matters worse I broke down and replaced both rear tires and tubes last year after years of running on cracked tires without a single problem.