CNC Machined Aluminum Single-Sided Motorcycle Swingarm

A single-sided swingarm carries the whole rear wheel load on one side, so stiffness and bore alignment drive the machining plan. We rough the arm from a solid block or a forging, leave stock for stress relief, and then finish the pivot bores, eccentric axle housing and mounting pads in a single 5-axis setup. Holding those features together keeps alignment errors from stacking between operations.

7075-T6 offers higher yield strength than 6061-T6, which helps keep wall sections slim, but it is harder to weld and slightly less corrosion resistant, so it is usually anodized. 6061-T6 is easier to repair and accepts welded brackets if needed. Finishes include bead blasting followed by black or clear Type II anodizing, Type III hard anodizing for bearing seats, or powder coat for show bikes.

Pivot and axle bores are measured on a CMM for diameter, roundness and parallelism, as these define how the rear wheel tracks. Thread gauges verify caliper and chain-adjuster holes. A first article is fully inspected before any batch, and dimensional reports can ship with the parts. Typical buyers are custom touring builds, café racer conversions and aftermarket brands validating a new rear-end design.