Well, i don't run one. Just a standard, aluminum Omni ( if i remember, been 27 years) since i put it in. I do remember putting in a new one a few years back). If they have built in bias, mine is hooked up backwards to boot . Works great, at 158 mph, no problem! When you consider the difference in braking capacity differance between a 25x3.5 tire up front and a 33x 15 in back, plus rhe rears are a race compound, it all worked out perfectly for my Dart, even if by accident