I was in the same need for some low grip , hard tires 'cause I can run in a Gym.hall with a polished wooden floor . For roadcourse racing all tires I tried had to less grip , even the softest with soft inserts . So I changed my mind to drifting , but found out , all drifttires have as little as no grip , made an awfull noise and left unwanted marks on the floor . So I ended up with Tamiya kit tires insertet with a ring cut from a plastictube and stuffed with hard foam . Those work perfect on my TT01 Drifter . The iserted plasticring makes the runningsurface of the tire hard as rock , ceates nearly noise , leaves no marks on the floor , has the good grip needed for drifting and seem to last for ever.