104mm Bike Chainring BCD Round 104BCD 32T-42T 7/8/9/10/11/12Speed DH XC Bike MTB
Wrong BCD will not works. This 104BCD chainring support for Shimano M391 M430 M590 M610 M615 M610 M670 M675 M770 M780 M785 M980 M640 M820, and Prowheel, IXF 104BCD crankset. 7-12 Speed System Support: Your bike front chainring will be 1x after install this chainring.