A narrow-wide narrow-wide rack of a known and valued A2Z brand. Made of lightweight CNC 7075-T6 aluminum.
The special design of narrow and wide teeth minimizes the risk of the chain falling while driving and basically eliminates the need for a chain tensioner.
Number of teeth: 30, 32, 34T.
Mounting: 104mm BCD.
Compatibility: 9, 10 and 11 speed chains.
Mounting screws not included.
30T sprockets are threaded.