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  • Meet the unsung hero of your bike’s drivetrain.


    Let’s face it. A bike’s rear sprocket gets the bulk of the love and attention. Maybe that’s because it’s right out there in the open where everyone can see it. Perhaps it’s because it’s large and in charge of spinning that rear wheel and converting all that engine torque into forward motion where the rubber meets to road. Or the dirt. But your bike’s drivetrain has another rock star that is often overlooked and really deserves some of the spotlight: the countershaft sprocket.

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  • Having the mettle to choose the right metal.


    Okay, you’ve clocked thousands of miles on your road bike. Maybe even some hard miles. And now it’s clearly time to swap out that factory chain and sprockets for a fresh set. The question is, what type of rear sprocket should you choose as a replacement?

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  • Cross-country racing tortures equipment. But it hasn’t broken this sprocket.


    Cross-country racing is brutal on men, women, and machine. Sustaining eye-popping speed through dirt, mud, sand, rocks, and water for seemingly endless periods of time is nothing short of the survival of the fittest. Especially for a bike’s drivetrain.

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  • Losing teeth can reap big rewards in performance.


    While it may not pay to put your old sprocket under your pillow at night, you can get big rewards in performance overnight by losing a tooth--or adding one--to your bike’s rear sprocket.


    No, there’s no sprocket tooth fairy (that we’re aware of), but there is an option for most riders who want to boost certain performance characteristics of their bikes. If you’ve got a bike or ATV with chain drive, you’ve also have a tunable drivetrain that can be modified slightly or dramatically to deliver exactly the performance you’re looking for.

    Pulling teeth. The sprockets installed on your machine at the factory were specified by talented engineers to provide the best all-around performance possible to suit the vast majority of riders. And, those factory-equipped bikes tend to do a great job of that. But for the rider who is looking for more immediate throttle response and faster acceleration than the stock configuration provides a relatively simple swap to a larger rear sprocket with one or two more teeth than the OEM sprocket can be like night and day. Similarly, for those looking for higher top speed and better fuel mileage than stock, switching out the factory rear sprocket for a replacement with one or two fewer teeth changes the gearing enough to accomplish the desired performance characteristics.

    Stick to the back teeth. For more incremental changes in performance, it is highly recommended to make changes to the rear sprocket versus the front. Especially since changing a single tooth on the front sprocket makes much more dramatic changes (often overly dramatic) than the rear and, when opting for a smaller front sprocket, it becomes harder for the chain to wrap around the smaller cog, thereby contributing to chain wear. Conversely, changes to the larger rear sprocket are much subtler and do not impact chain wrap and chain wear. If you’re looking for bigger changes, you may find that a combination of front and rear will work best.

    No need for a toothache. You don’t have to pull your hair out to grasp what sprocket teeth to pull or to add. The Sunstar website has a Ratio for Sprocket Combinations table in the Tech Info section that can help you determine exactly how each sprocket configuration will change the gearing of your bike. You can quickly see how a subtle or a more significant sprocket choice will vary from the stock gear ratio and how the desired effect can be accomplished with just the rear sprocket or in a combination of front and rear sprocket changes (for instance, one tooth larger front paired with a one tooth fewer rear).

    A material consideration. Beyond gear ratio, performance is also affected by sprung weight. The lighter the weight, the less mass must be moved by the engine. Choosing a sprocket made of aluminum can provide significant weight savings over stock steel sprockets (although it will not last as long). Or check out the hybrid options that combine lightweight materials with durable steel teeth rings to establish the ideal combination of weight savings and long-term performance.

    Check out the sprocket options and helpful gear ratio information for your machine at sunstar-braking.com. Need help selecting the right parts for your needs? Just ask! 

  • Keeping your sprocket teeth and chain clean can keep you smiling

    Mud in your teeth

    April showers bring … mud. And mud brings greater wear and tear to your bike’s sprockets and chain. Grime and gunk also create drag that robs your bike’s performance. Keeping the drive train clean and free of crud will extend the life of critical components and maximize its usable power. Here’s how to live and ride crud free.

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  • Spring Cleaning. And Inspecting. And Adjusting.


    Like many riders—especially those in cold-weather climates—you probably put your bike in storage for the winter. But even though it had no wear and tear on it from riding during those winter months, all of that sitting may have taken a toll.

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  • Sealed With an X


    Traditionally, at the factory where your bike was made, grease or another lubricant was applied to your bike’s chain. The problem is, road grime is also drawn into the chain once you began riding the bike. That dirt sticks to the lubricant like glue quickly compromise the factory lubrication, adds grit and accelerates wear. For longer-lasting performance, there was a need to seal in all of that gooey goodness while keeping the outside grime outside so that your bike’s chain could stay lubricated for a lifetime.

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  • Sizing It Up


    Sprockets and chains come in a variety of sizes. Each of those sizes is assigned a three-digit number that is, quite frankly, a great mystery to most riders. Yet, understanding how the numbers work and what setup is right for your bike or ATV is essential. Plus, once you grasp the terminology, you can impress your riding buddies with your knowledge. So let’s get started.

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  • When it comes to performance, every ounce counts!


    It’s just part of who we all are as performance-oriented riders. We want to squeeze every bit of performance from our bikes. Two ways we do that are by finding ways to add horsepower to the engine and by trying to reduce the bike’s overall weight to establish a more favorable power-to-weight ratio.

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  • On track to make the best products in the business.


    Nothing contributes to product development quite the way that racing does. After all, the race track is the ultimate proving ground for motorcycle components. Especially sprockets and chains.

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