i aint getting a grind just yet my koxx yellows in heatsink backings work AMAZING on a smooth rim with a very small smudge of tar i am loving the front tire thanks i have only just put it on the front though because it was my rear tire and i had it on the rear for over year now and they are amazing tires they have such a soft grippy compound but they last soooo long the tire still has 3mm of tread left in the middle the side walls on these tyres arnt very thick but the have very good puchure resistance THESE TIRES ARE THE BOMB and they weigh very little when i were my tires out im getting them on the front and rear thanks for the comments peeps