Grom/Z125 Chain and Sprockets Rear Sprocket Size:39 Made of case hardened steel

Made of case hardened steel

The Superlite RS7 Series rear sprocket is the #1 selling steel racing sprocket on the market today

The unique RS7 spoke design offers superior strength with maximum weight reduction making it the lightest and strongest steel sprocket available

* No color options are available at this time

they are chemically etched to give them a uniform

Grom/Z125 Chain and Sprockets Rear Sprocket Size:39 Made of case hardened steelAll ProSeries Sprockets are Made in the USA from the harder grade 7075 T6 certified aero space industry aluminum for long life and light weight. They are machined to exact specs with tolerances much more stringent than other aluminum sprockets and many times tighter than OE sprockets. What this means is that your chain will fit the sprocket better and everything will last longer. Additionally, they are chemically etched to give them a uniform, even