Yeah they seem mega grippy too, those banebots wheels everyone uses feel alot softer. My work has different coloured ones yellow, red, black but the red seem to have the toughest rubber/tread.

and ive got 6 speed 900s lol! Including ts3s weapon motor so i shud be fine ....... ive only ever snapped the output shaft on one but that was due to a welded on gear weakening it. These will all be grub screwed and everything securely mounted