[diginahole]

I let mine go until they don't hold wind aswell. Errr, actually.... I replace all 4 when the first one lets go and keep the best one for a spare. Never seen anywhere close to 1000 hours on a tire. We do a lot of 180 degreee turns on asphalt. Front tires wear faster than rears because they actually scrub more than rears when turning with an empty bucket. If you really think about it the bucket is probably empty twice as often as it is loaded. I often lift the front tires off the ground when performing sharp turns on asphalt to save a bit of tread.