Specialized Stumpjumper Seatstay

No, this specific component is engineered exclusively for 2025 and newer Stumpjumper 15 carbon bikes and framesets. It will not fit previous generations of the Stumpjumper due to changes in frame geometry and pivot placement.

Yes, it arrives pre-equipped with the necessary Horst pivot bearings and middle spacers. You will still need to transfer your existing hardware, such as bolts and derailleur hangers, to complete the installation.

No, this part is designed for the 12x148mm Boost axle standard. Using a non-Boost wheelset will not provide the correct spacing or alignment required for the Stumpjumper 15's rear triangle.

This carbon fiber seatstay is intended specifically for the carbon version of the Stumpjumper 15. We recommend checking your specific frame material and model year, as alloy and carbon frames often have different pivot tolerances and structural requirements.

You will need a standard set of hex keys and a torque wrench to ensure all pivot bolts are tightened to the manufacturer's specifications. It is also helpful to have a bearing press tool on hand if you ever need to service the pivot bearings in the future.