917950-1 SPEEDWAY MOTORS Gear Set

Review SPEEDWAY MOTORS Premium Lightweight Quick Change Gear Set #1 21/21 Teeth

The Speedway 917950-1 Gear Set is an essential upgrade for any bicycle looking to improve its efficiency and performance. This gear set, with a pitch size of 21/21 teeth, is designed to fit most standard bicycle drivetrains.

The 21-tooth chainring is engineered to provide a wider gear range, allowing riders to conquer steeper climbs with ease. Its precise tooth design ensures optimal chain engagement, reducing the risk of skipping or slipping during pedaling. This chainring is CNC machined from high-quality aluminum, offering lightweight durability and a sleek, modern finish.

The companion 21-tooth cog is engineered to pair seamlessly with the chainring, providing a perfect gear ratio for those tackling challenging terrain or seeking a more aggressive riding style. Its robust design ensures reliable performance, even under heavy load. Both the chainring and cog are anodized for added protection against corrosion and wear.

This Speedway 917950-1 Gear Set is designed to work with standard HG (HyperGlide) and SGX (Shimano XT) freehub bodies, making it a versatile choice for a wide range of bicycles. The smooth, quiet operation of this gear set is a testament to its high-quality design and manufacturing.

In summary, the Speedway 917950-1 Gear Set is a top-tier upgrade for any bicycle, delivering improved efficiency, wider gear range, and a more aggressive riding experience. Its durable, lightweight design and compatibility with a variety of freehub bodies make it an excellent choice for cyclists seeking to enhance their bicycle's performance.

The Speedway 917950-1 gear set is a popular choice for those looking for a high-quality and affordable replacement for their motorcycle's transmission gears. Here are some pros and cons to consider before making a purchase.

1. Affordable: Compared to OEM (original equipment manufacturer) gears, the Speedway 917950-1 gear set is significantly more affordable, making it an attractive option for budget-conscious riders.

2. Durable: Made from high-strength steel, these gears are designed to withstand the rigors of motorcycle use. They offer excellent tooth engagement and are less prone to wear and tear.

3. Wide Application: This gear set is suitable for a wide range of motorcycle makes and models, making it a versatile option for many riders.

4. Easy Installation: The gears come pre-assembled, which simplifies the installation process and saves time and effort.

5. Improved Performance: Upgrading to a high-quality gear set can lead to improved performance, including better acceleration and smoother shifting.

1. Potential for Noise: Some riders have reported an increase in gear noise after installing the Speedway 917950-1 gear set. This can be due to differences in tooth design or manufacturing tolerances.

2. Unsuitable for Heavy Use: While these gears are durable, they may not be suitable for heavy use, such as racing or high-performance riding. In such cases, investing in OEM gears or a more advanced aftermarket gear set may be necessary.

3. Limited Availability: The Speedway 917950-1 gear set may not be readily available in local motorcycle stores, requiring riders to order online or from specialty retailers.

The Speedway 917950-1 gear set offers a cost-effective and durable solution for replacing motorcycle transmission gears. Its wide application and easy installation make it a popular choice among riders. However, potential issues with noise and suitability for heavy use should be considered before making a purchase. Ultimately, the decision to buy this gear set depends on individual riding needs, preferences, and budget.

For budget-conscious riders looking for a reliable and durable gear set for everyday use, the Speedway 917950-1 gear set is an excellent choice. However, if you require gears for heavy use, racing, or high-performance riding, it may be worth investing in a more advanced aftermarket gear set or OEM gears. Always ensure that the gear set is compatible with your motorcycle make and model before making a purchase.

Details:

But you can make the most of that horsepower by reducing weight in driveling. Premium lightweight quick change gears are drilled to reduce rotating weight, deliver the most power ground. Suitable for 410 sprint cars, 360 305 modified, open late model's and crate.

Lightweight gears are perfect for limited power such as crate engines to give quicker spin up time and maximum transfer. Track tested 8620 steel stands up to the competition: high demands are placed on the quick change gears of rear ends but Speedway motors has found a lightweight answer. Less weight and reduced friction surfaces means more power to the ground: rotating mass means more power goes tires. The smaller gear has not been undercut or drilled on the following sets.

Available in a large number of gear ratios to fine tune the track conditions or your street applications. Competition driveshafts and lightweight ring pinions can reduce rotating mass, making starts quicker more of that power it to the rear wheels. 8620 alloy steel stands up to the demands of high horsepower engines and large tires. Rem polished surfaces and crown shaved profile teeth reduce friction, run cooler longer deliver maximum tooth contact.

Rem finished polished surfaces and crown shaved profile teeth provide better tooth contact which means reduced friction, longer life cooler running, not only makes these perfect for the demands of racing, but also make a great complement to quick-change street setup - finish quieter running rear-end. See installation tips for details. Our lightweight gears are perfect for high-horsepower applications with large tires. Lightweight 10-spline gears feature reduced rotating weight which is ideal for limited power such as crate engines, constructed from high strength 8620 alloy steel making them suitable use in hp cars with bigger tires, rem polished surface reduces friction and extends gear life, quick change have crown shaved profile teeth maximum contact, note: some ratios offered at price due to small set not being drilled and/or lightened.

Headquarters. But theres one more place where you can get an advantage: the rear end quick change gears. Polished surfaces run quieter, making for an excellent gear option a street quick change rear end.

specifications differentialsdepo:

• brand: Speedway Motors
• mpn: 917950-1
• type: Quick Change Gears
• item length: 8.40
• california prop 65 warning: True

shipping differentialsdepo:

• transit: 4-4 days
• class: economy, expedited
• type: fixed
• service: economy, expedited

seller differentialsdepo:

• rating: 99.6%
• city: lincoln, nebraska
• # reviews: 341780

returns differentialsdepo:

• time: 30 days
• paid by: seller
• policy: returns accepted

payments differentialsdepo:

• other
• credit card: visa
• wallet: google-pay

general differentialsdepo:

• category: Auto Parts > Transmission Drivetrain > Differentials, Assemblies > Additional

offer differentialsdepo:

• availability: in stock
• sold #: 12
• options: ship-to-home
• started: december 16, 2025
• price: $142.99
• item condition: New