Function:It can extend the 130-length hub to 135MM to adapt to the 135MM frame.For example: the hubs of road bikes are mostly 130MM. If you want to install them on the mountain bike frame 135MM, you only need to use this conversion seat. There is no need to replace the hubs, saving costs.When installing, install the conversion base to the hub and then support the frame with a little force to install it.The strength of stainless steel is greatly improved than that of aluminum alloy. safer.Material: Stainless steelSpecification: 130-135Size: 20 x 11 x 10mmNet weight: 12.3gcolor:silverPackage Contents: 1 x bike hub Conversion SeatOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.