Bicycle Narrow Wide Disc 130mm BCD Bicycle Disc For 50T Road Bike Description: [Material]: The narrow wide bicycle disc is made of 7075 aluminum alloy, CNC cut, with positive and negative designed to prevent the chain from falling, strong force. [Specifications]: The BCD crank (distance between holes) is 130 mm. [Easy to Use]: Slanted mouth drains mud to prevent sediment buildup. The thickness of each tooth is processed, which can work seamlessly with the interior and chain to fit your ride and reduce friction and noise. [Round Bicycle Disc]: The anode is tinted to prevent oxidation, so that an oxide layer can appear on the surface of the aluminum, which effectively protects the aluminum alloy body. Anti-corrosion, . [Note]: The bicycle disc is suitable for most 130 BCD cranks. Specification: Material: Aluminum Alloy Size Chart: 50 T: 20,9 cm x 20,9 cm / 8,23 inch x 8,23 inch 52 T: 21,6 cm x 21,6 cm / 8,50 inch x 8,50 inch : 22,5 cm x 22,5 cm / 8,86 inch x 8,86 inch 56 T: 23,3 cm x 23,3 cm / 9,17 inch x 9,17 inch 58 T: 24,1 cm x 24,1 cm / 9,49 inch x 9,49 inch : 24,9 cm x 24,9 cm / 9,80 inch x 9,80 inch The package includes: 1x bicycle disc