For racers hunting for smart weight savings and optimized rotating weight, XRAY offers this ultra-lightweight solid axle as a direct replacement for the standard diff or Multi-Diff. This axle is 56% lighter compared to the standard Solid Axle, with a hollow axle for super-low rotating weight. The ultra-strong 1-piece solid axle is CNC-machined from world-renowned HUDY Spring Steel, and includes lightweight aircraft aluminum pulley adapter.