The CV Hub wheel end, with its reduced scrub radius, was significantly less sensitive to brake lead caused by different brake reactions at the left or right side tire patch. In the baseline production vehicle with 54.8-mm (2.16-in.) positive scrub, the normal lead braking produced a drift to the left of 2.2 m (7.2 ft) and the bias braking produced a drift of 8.5 m (28 ft.) to the left. The CV Hub modified vehicle in each case drifted to the left 1.8 m (6 ft). As shown by the experimental data in Table 3, reduction of scrub radius improves vehicle straight-line tracking for a variety of braking conditions.

Additionally, reduction of scrub radius alters some of the steady state steering parameters of a vehicle. The understeer coefficient, K, has an inverse relationship with scrub reduction explained by the change in the roll steer coefficient associated with changing scrub. The test vehicle also exhibited higher levels of lateral acceleration as scrub radius was reduced.

Transient handling behavior was also affected by scrub radius changes. The test vehicle exhibited reduced steering wheel effort for transient maneuvers. As scrub approaches zero from the positive side, steering wheel effort decreases. However, reducing scrub radius farther into the negative region created an even greater detrimental increase in steering wheel effort during the transient maneuvers.

In conclusion, the vehicle test data support the position that reduction of scrub radius improves vehicle drift performance during braking, increases the understeer coefficient, increases the obtainable lateral acceleration, and reduces the required steering wheel effort to perform transient maneuvers.