When suspension modifications are undertaken to lower a vehicle the angle of the tie rods change. This creates bump steer which effectively changes toe-in or toe-out as the suspension rises and falls. This in turn can affect handling and tyre wear.

To achieve zero bump steer the front end must have the correct geometry. The tie rod must travel on the same arc as the suspension when the vehicle goes over a bump in the road. You need to match lengths and arcs to prevent any unwanted steering of the front tyres.

To correct the change in the tie-rod angle GReddy have introduced a range of "tie rod angle adjusters" which are replacement tie rod ends that correct the angle of the tie rod.