140 Spokes Flange Adaptor for Shimano Nexus 3-Speed Coster Hub Fits only on Shimano 3 speed coasterbrake hub Steel: black Comes with all needed stainless quality screws and inbus wrench inner diameter: 53 mm (~2,09 inches) outer diameter: 109 mm (~4,29 inches) To calculate the spoke length: outer bore belt: 102 mm (~4,01 inches) inner bore belt: 95 mm (~3,74 inches)