HPI Racing now offers these
Aluminum Hex hubs as an option part for use on most 1/10th scale touring cars. Standard equipment on the National Champion Pro 4 touring car, these thin 4.8mm hubs give racers the ability to adjust the width of the car in fine 1/2mm increments using the included 1.0mm and 1.5mm aluminum washers. Machined from lightweight aluminum alloy and purple anodized, these hubs offer tuning advantages, look great, hold the wheels firmly in place, and are more durable than plastic hubs.
