DT Swiss XD End Caps Replace your DT Swiss 180, 240, 350, or 440 rear hub end caps with ease. These caps are precision-machined and are crafted with legendary DT Swiss precision. They're compatible with DT Swiss 180, 240, 350, and 440 rear hubs size 12x142mm. Note; these endcaps will not convert a non-Boost hub to Boost spacing, but both Boost and non-Boost hubs share the same endcaps. Features Hub compatibility DT Swiss 180, 240, 350, and 440 Hubs Note:endcaps will not convert standard 142mm spacing to Boost 148mm Manufacturer item number HWGXXX00S3188S | Dt Swiss | Xd End Caps 142Mm X 12Mm, Fits 240, 350 And 440 Hubs