Specifications: Diameter: 35mm Includes: 2 X Wheel hubs with rotors Hardware: 12 X M2.5 x 8mm screws Features: CNC machined aluminum Lightweight Black anodizing Fit standard 12mm hex Fit Axial 12mm hex SLW hub bolt pattern Metric M2.5 thread (hardware included) Fit all SSD 1.9 and 2.2 wheels These hubs do not increase the wheel track width Can be used on any SLW hub compatible wheels (VP, Axial, Proline, Locked Up, etc...) Compatible with SSD knuckle weights (SSD00140) Fit Traxxas TRX-4 axles