- 104mm BCD support: Bolt Circle Diameter(BCD) is 104mm. 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.
- Aluminum 7075 and CNC Process: Aluminum 7075 ensure it is lightweight but stiffness. Full CNC makes the precision size and nice surface looking. 30-38T is 40-70g only(1.4-2.5oz).
- 7-12 Speed System Support: Your bike front chainring will be 1x after install this chainring. And rear flywheel cassette may 7/8/9/10/11/12s. 1x system makes your bike more lightweight compare to 3x and 2x.
- Upgraded Narrow Wide Tooth: Current tooth shape is 2nd generation narrow wide tooth. With more curve and easy to clean and self-clean from soil. Makes the chainring lifespan more longer.
- 1 Year Coverage: We offer 1 year Coverage. The package content is chainring and 4 pairs steel bolts.
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