Traxxas 8374A 1.9" Mounted Tires / Wheels Orange Rear 4-Tec Ford GT Monster Truck XL Parts Kyosho describes the purpose directly:

Kyosho describes the purpose directly: the weights attach to the front knuckle to increase tire load and change steering response

Complete air cleaner set

4x M3 x 6mm BHCS (Sliver) (Z-S0960)

Painted from the inside

Traxxas 8374A 1.9" Mounted Tires / Wheels Orange Rear 4-Tec Ford GT Monster Truck XL Parts Kyosho describes the purpose directly:Traxxas 8374A Tires and Orange Wheels Assembled Glued 1. 9" Response Tires This is the Tires and Wheels Assembled Glued (split spoke orange wheels, 1. 9" Response tires) (extra wide, rear) (2) (VXL rated) from Traxxas. Fits: 4 Tec 2. 0 AWD Chassis 4 Tec 2. 0 VXL AWD Chassis Ford GT Ford Mustang GT