This kit supplies 40-series wide offset wheels and tyres for 1/8-scale Traxxas Revo and HPI Savage 25 applications, designated RE-043A/BL4. Supplied as two pairs in black, the set is intended for precision fitment where track width and tyre stance are being adjusted as part of a handling setup.
As an aftermarket component for the vehicle names stated in the product title, installation involves replacing the stock wheels and mounting the supplied wheels to the existing wheel hex and hub hardware specific to those models. Verify hex engagement, check for proper axial clearance, and secure fasteners to recommended torque values prior to operation.
From a setup and tuning perspective, the increased offset shifts the tyre contact patch outboard which affects roll centre behaviour and lateral stability on loose surfaces. Use measured test runs to evaluate the net effect on understeer/oversteer balance and adjust suspension or tyre pressure only after documenting baseline performance.
A technical upgrade option for those refining track width and tyre stance on the listed chassis; check hub and hex geometry and proceed with incremental testing to dial handling response.