Feature: * Fit for MTB Bike,XC/Off Road/AM bike modified single chainring. * fit 6/7/8/9/10/11/12 speed shimano sram chain,fit JIANKUN(IXF) crank and Shimano M370/M410/M610/M670/M780 crank (not fit M7000/M8000/9000). Fit SRAM/FSA/Prowheel 104bcd crank. * Better after-sales service,we will reply you within 24 hours! * Ship in 0-1 day and reach the delivery within 1-3 working days generally. Description: Brand: SNAIL Type: Single speed Color: Black,Red,Blue,Green,Gold,Purple Material: Aluminum alloy 7075-T6 Bolt Center Diameter: 104mm BCD Teeth: 32-52T (Round/Oval,optional) Thickness: 4mm (1.9mm Narrow, 3.7mm Wide) Compatible with: 7/8/9/10/11/speed chains (for Shimano/SRAM/FSA crank) Narrow Wide tooth profiling ensures ultimate chain retention with 1x chains. Weight: 38g-30t,(different siz.