64Pcd 4 Arm 8/9X Chainrings

The Chinook range was changed to cater for far reaching technical gear system developments. The new generation middle rings have two pairs of shortened teeth to assist down-shifting. * Compatible 9 speed * Inner: 22, 24, 26, 28 ,30t, * Colours : Silver or black. * Material : AL 7075 T6 * PCD : 64mm.