I just changed mine at 800 miles. I ordered the pads for the big red b/c they were half the cost of the Pioneer. They are installed and work fine. Two differences though. 1. The "squeeler" is on the top of the new pads versys the bottom of the old pads, but there were no clearance issues. 2. The material the new pad is made of looks a little different from the stock ones. There may be a difference in the specs (heat/friction rating) but the machine stops just like it did with the stock ones. Put about 50 miles on the new ones this weekend and no problems.