[400TT]

Excessive bump steer both front and rear is a pet hate of mine. Unfortunately you can just jack up some kits and visually see the bump steer on suspension droop.

It's a shame that not all states require bump steer to be verified for registration.

On our kits we have less than 1mm of bump steer at tyre diameter through full travel. Actually on some of the kits we can dial the bump steer so close to 0 that there is effectively no bump steer. That's both front and rear.

Just keep in mind bump steer will be affected by your caster changes. On all kits we have quick adjustment so that owners can dial front bump back to virtually 0 if they are running a custom camber or we can tell them the settings required for bump adjustment at a set caster. We also have bump adjustment on rear on most kits as well.

We actually check with the customer on their requirements and set caster and bump steer front and rear from the factory.

We use a bump steer jig like most race teams use. Big flat plate bolted to the hub with tracing mechanism on it. Once you get it close, you really need dial gauges to measure the changes.