Specialized Fatboy Rear Axle

No, this component is specifically engineered for the 2015 Specialized Fatboy rear hub. It is not designed as a universal part, so we recommend verifying your bike's specific model year and hub spacing before purchasing.

Steel is chosen for this application to provide superior durability and structural integrity under the high-torque demands of fat biking. While it adds a slight amount of weight compared to aluminum, the increased strength ensures reliable wheel retention.

This product is the axle itself. It is designed to work with the existing hardware on your 2015 Fatboy, so you should reuse your current nuts and washers during installation.

You should consider a replacement if you notice stripped threads, visible bending, or if the axle no longer holds the wheel securely in the dropouts. If you experience persistent creaking or play in the rear wheel that persists after tightening, the axle may be compromised.

The 190mm measurement refers to the width of the rear hub shell where the wheel sits in the frame. This is a standard width for many fat bikes of that era, and this axle is precision-machined to span that exact distance to ensure proper fitment.