SUNSHINE XD Structure Bicycle Cassette12 Speed 9T-50T Mountain Bike Freewheel for Sram XD freehub GX EAGLE XX1 X01 XD Color : Black Material : High strength steel (9-42T) and 7075 Alloy(50T) XD-12S-50T Tooth Distribution Range: 9T-11-13-15-18-21-24-28-32-36-42-50T XD-12S-50T Weight : ≈ 535g XD-12S-52T Tooth Distribution Range: 10T-11-13-15-18-21-24-28-32-36-42-52T XD-12S-52T Weight : ≈ 541g SUNSHINE Cassette offers a larger range, We provide the most practical and cost-effective products on the market. , our 12speed 9-50T L cassette has an improved structure for smoother shifting. Please note: The XD freehub body is designed for mountain bikes, while the XDR freehub body is designed for road bikes. They are not interchangeable. The spline length of the XDR freehub body is 7.2mm, whereas the spline length of the XD freehub body is 5.4mm — a difference of 1.8mm. Therefore, do not install an XD-type cassette onto an XDR freehub body, as it will result in a loose fit even after installation. We will not accept any disputes arising from this issue. The XD-structure bicycle hub base has a ring of splines approximately 8mm long. One of these splines is narrower and serves as a positioning element. Similarly, the XD-structure bicycle freewheel has a ring of grooves at the mounting point, including another narrow groove. During installation, this smaller positioning spline must be aligned with the narrow groove on the freewheel bracket and inserted before tightening the mounting screws. As the screws are tightened, the spline on the hub base will engage tightly with the groove on the freewheel, completing the installation.

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