If you want to drive 1x12, 1x11 1x10 or 1x9

The chainring teeth are optimized with narrow wide teeth to prevent (chain-drop) so the chain does not fall off.

Can run without chain guide.

If it is mounted on a triple crank, it must be able to be mounted in the middle position.

Note that if it is to be used for 9 speed, the chain must be 10 speed.

Aluminum 7075