How low do you guys run your tires? My rear tire is past the wear bar separating the middle knobs but they are still 10mm tall. When do you replace them. I am just ridding indoors now so the track is hard pack and gets a little slippery in the corners. Would a new tire even be noticeable in this conditions? What do you recommend for a rear tire ridden on hard pack surface. At least I think it is a hard pack surface the dirt around here is a mixture of clay and top soil. South west Ohio. What do you look at for determining wear on the front tires? Sorry for the basic questions.