MGBs were produced with a castor angle of 6.5 degrees to allow for tyre slip of 10 to 11 degrees. Modern tyres have a slip angle of 2 to 3 degrees, causing the MGB steering to load up and become increasingly heavy the harder you corner. Castor angle is employed primarily to self-centre the steering at speed. As modern tyres are far more directional, less self-centring force is required and therefore less castor.

Frontline’s innovative castor wedges fit between the chassis and the front crossmember to rotate it forwards by around 3 degrees, thereby reducing the castor angle. The result gives noticeably lighter steering that doesn’t load up when cornering, increases positive feedback through the steering and improves directional control.