y grind ur rim? u weaken it, u get through pads quicker, etc. grinding rims first came about years ago for comp riding as a way to chanell out xcess water, and i don't mean stupid all over grinds, i mean grooves every half inchor so, be different m8, don't follow the crowd, unless your sponsored an get given wheels all the time, otherwise its just not worth it. btw i use no grind black pads and bitumen an that works as well as any of my m8s brakes.