917950-21 SPEEDWAY MOTORS Gear Set

Review SPEEDWAY MOTORS Premium Lightweight Quick Change Gear Set #21 19/29 Teeth

The Speedway 917950-21 Gear Set is an essential upgrade for your bicycle's drivetrain, designed to deliver optimal performance and efficiency. This 21-speed gear set comes with a total of 21 gears, including 7 in the cassette at the rear wheel and 3 chainrings at the crankset, providing an extensive range of gear options for various riding conditions.

Each gear in this set is meticulously crafted using high-quality materials. The cassette is made of durable steel, while the chainrings are forged from aluminum, ensuring robustness and longevity. The teeth on the gears are precisely machined to ensure smooth and reliable shifting, even under heavy loads.

This Speedway 917950-21 Gear Set is compatible with a 19/29 tooth chainring combination, making it suitable for various bicycle configurations. The gearing range offered by this setup caters to both flat terrain and steep inclines, allowing you to conquer any riding challenge with ease.

The Speedway 917950-21 Gear Set also includes a 10-speed compatible chain, ensuring seamless transition between gears. The chain is made of high-performance alloy, offering excellent wear resistance and corrosion protection.

Installing this gear set is a breeze, thanks to its compatibility with standard HG (HyperGlide) 10-speed freehub bodies. Additionally, the set includes a 10-speed compatible rear derailleur hanger, making it a convenient and complete solution for upgrading your bicycle's drivetrain.

In summary, the Speedway 917950-21 Gear Set is a high-performance and versatile upgrade for your bicycle. Its extensive range of gears, durable construction, and seamless compatibility make it an excellent choice for riders seeking to enhance their cycling experience.

The Speedway 917950-21 gear set is a popular choice for those looking for a high-performance drivetrain upgrade for their bicycle. Here are some pros and cons to help you make an informed decision:

1. High-quality components: The Speedway 917950-21 gear set is made of high-quality materials, ensuring durability and reliability. The gears are made of chrome-molybdenum steel, while the chain is made of cold-forged and heat-treated steel.

2. Wide range of gears: With a 21-speed setup, this gear set offers a wide range of gears, making it ideal for tackling various terrains and inclines.

3. Smooth shifting: The Speedway 917950-21 gear set is known for its smooth and precise shifting, making your ride more enjoyable.

4. Compatibility: This gear set is compatible with most standard HG-type freehubs, making it a versatile option for many bicycles.

1. Installation can be challenging: Installing this gear set can be a complex process, especially for those who are not familiar with bicycle mechanics. It may be necessary to take your bike to a professional for installation.

2. Cost: The Speedway 917950-21 gear set is a high-performance component, and as such, it comes with a higher price tag than some other options.

3. Weight: This gear set is heavier than some other options, which can affect the overall weight and performance of your bicycle.

The Speedway 917950-21 gear set offers high-quality components, a wide range of gears, and smooth shifting, making it an excellent choice for those in search of a high-performance drivetrain upgrade. However, the installation process can be challenging, and the cost and weight may be a consideration for some.

If you are looking for a high-performance gear set with a wide range of gears and smooth shifting, the Speedway 917950-21 gear set is an excellent option. However, be prepared for the challenge of installation and the higher cost and weight compared to other options. If you are not comfortable with installation, consider taking your bike to a professional for installation to ensure proper setup and function.

Details:

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. But theres one more place where you can get an advantage: the rear end quick change gears. 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. Available in a large number of gear ratios to fine tune the track conditions or your street applications.

Less weight and reduced friction surfaces means more power to the ground: rotating mass means more power goes tires. Suitable for 410 sprint cars, 360 305 modified, open late model's and crate. Competition driveshafts and lightweight ring pinions can reduce rotating mass, making starts quicker more of that power it to the rear wheels. The smaller gear has not been undercut or drilled on the following sets.

Lightweight gears are perfect for limited power such as crate engines to give quicker spin up time and maximum transfer. But you can make the most of that horsepower by reducing weight in driveling. Our lightweight gears are perfect for high-horsepower applications with large tires. Premium lightweight quick change gears are drilled to reduce rotating weight, deliver the most power ground.

8620 alloy steel stands up to the demands of high horsepower engines and large tires. Headquarters. Rem polished surfaces and crown shaved profile teeth reduce friction, run cooler longer deliver maximum tooth contact. See installation tips for details.

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. Polished surfaces run quieter, making for an excellent gear option a street quick change rear end.

specifications differentialsdepo:

• for years: 2021
• brand: Speedway Motors
• mpn: 917950-21
• type: Quick Change Gears
• item length: 8.40
• california prop 65 warning: True

payments differentialsdepo:

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

returns differentialsdepo:

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

shipping differentialsdepo:

• service: economy, expedited
• type: fixed
• transit: 6-6 days
• class: economy, expedited

general differentialsdepo:

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

seller differentialsdepo:

• city: lincoln, nebraska
• rating: 99.5%
• # reviews: 338855

offer differentialsdepo:

• availability: in stock
• started: november 25, 2025
• price: $142.99
• item condition: New
• options: ship-to-home
• sold #: 14