I bought a Bullrider last season. I like it (switch between that and the Proslide every couple weeks for variety) BUT -- when turning have to be VERY careful. The tires often dig into the lawn when turning from the sidewalk, sometimes badly ripping the lawn. It's because the tires are almost totally flat due to the tread design (I also use minimal air in them for a smooth ride). Has anyone replaced the tires on their Bullrider for this reason? If so, please let me know what kind of tire you switched to. I don't mind buying new tires AND rims for it, but don't want to modify the Bullrider for them to fit, as Switchless has done.