once it slips... it WILL slip.... I have run my DB-02 (501X WE pulleys) and not had an issue, and can't see it being an issue. The only thing I find with the Tamiya belts (buggy and tourer) is that from new, they need re-tightening after a couple of runs, if you don't, it slips.
James, when you start to run proper gear ratio's where you are running the motor correctly, them lazer belts will be just as fragile..... anyhows, I am sure there is a vintage car thread somewhere
