Keenso Mountain Bicycle Flywheel, Freewheel cassette Sprocket 7 speed Bike Replacement Accessory7

Low Noise --- The high speed bike cassette can promise smooth rotation of chain without much noise, which providing fast riding speed with less effort needed. Premium Material --- This Bike 7 speed freewheel constructed of high quality strength steel material, which is anti-rust and non-deformation, wear-resistant and high performance. It's to use and can maintain a long service lIfe. High Precision --- This Bicycle 7 speed cassette adopted Hhgh precision thread ensures close connection with the bike hub and smooth Suitable for --- Size: 11.5 * 11.5cm / 4.5 * 4.5in, which is to use, applicable to mountain bike freewheel. Service guarantee --- We offer perfect customer service. If you have any questions, please do not hesitate to contact us. We will do our best to help you solve your problem.