I've only run my multi-diff locked, all four of the asphalt tracks I run on require braking a couple of spots. I've tried it with the locked one-way but won't work on the tracks around here. Even at Speedline (which has been a copy of the Reedy track for a while) you still must use some brake. Maybe if I played with it some more it may work at speedline but I'm an aggressive driver so I like the spool.