About The Product
- Designed to perfectly compliment KMC`s line of chains
- Carefully designed lifting and lowering shifting ramps ensure improved shifting, efficiency and stability
- Optimised gearing results in fewer large jumps in tooth count for smooth, predictable progressive shifting
- Shimano HG compatible interface
Upgrade your bike's performance with the KMC GMX8-3 11-32t 8-Speed Cassette - a versatile, high-performance component designed for seamless shifting, durability, and optimized gear range. Crafted with precision engineering and durable materials, this cassette ensures smooth, reliable operation across diverse riding conditions, from casual rides to challenging off-road adventures.
Materials and Durability
Constructed with high-quality steel, the KMC GMX8-3 cassette offers exceptional longevity and resistance to wear. Its robust build withstands the demands of frequent riding, ensuring consistent performance and minimal maintenance over time.
Performance & Engineering
Designed to perfectly complement KMC's line of bicycle chains, this 8-speed cassette features carefully engineered lifting and lowering shifting ramps. These enhancements deliver improved shifting efficiency and stability, providing riders with smooth gear transitions. The optimized gear progression, from 11t to 32t, minimizes large jumps, enabling predictable and progressive shifting for a more comfortable ride.
Components & Technology
The GMX8-3 cassette boasts a thoughtful gear ratio arrangement with cogs at 11, 13, 15, 18, 21, 24, 28, and 32 teeth. It's fully compatible with Shimano HG freehub bodies, making it easy to integrate with a wide range of drivetrain setups. Its durable steel construction ensures maximum compatibility and long-term reliability.
Style & Use Case
Ideal for mountain biking, gravel riding, and trail adventures, the KMC GMX8-3 cassette provides the perfect gear range for tackling steep climbs and fast descents alike. Its sleek black finish adds a modern aesthetic to any bike setup, emphasizing both style and functionality.
Innovative Features
This cassette's highlighted features include optimized gear jumps for smoother shifting, compatibility with high-performance KMC chains, and a design focused on efficiency and rider confidence. Whether upgrading an existing drivetrain or building a new bike, the GMX8-3 cassette offers a reliable, high-quality solution for adventurous cyclists seeking performance and durability.
Key Specifications:
- Gear Range: 11-32 teeth
- Tooth Count: 11, 13, 15, 18, 21, 24, 28, 32t
- Number of Speeds: 8-speed
- Compatibility: Shimano HG freehub bodies
- Material: Hardened steel for longevity
Enhance your cycling experience with the KMC GMX8-3 8-Speed Cassette - the perfect choice for serious riders seeking smooth shifting, durability, and versatile gearing performance.
- Optimized for durability and smooth performance, the KMC GMX8-3 8-speed cassette features high-quality steel cogs with precise machining to ensure reliable shifting and long-lasting wear resistance.
- Engineered with carefully designed lifting and lowering ramps, this cassette provides improved shift stability and efficiency across all gear ranges, delivering a seamless riding experience on mountain and hybrid bikes.
- Compatible with Shimano HG drivetrain systems, the GMX8-3 offers easy installation and versatile performance, making it ideal for riders seeking reliable component compatibility and versatile gearing options.
- With an 11-32 tooth range, this cassette offers optimized gear steps for smooth, progressive shifting performance, reducing large jumps and enhancing control on diverse terrains and trail conditions.
- Designed to complement KMC's line of high-performance chains, the GMX8-3 cassette ensures precise engagement and minimal drivetrain slack, maximizing efficiency and extending the lifespan of your cycling drivetrain components.
| Specification | Value |
|---|---|
| Manufacturer | KMC |
| Manufacturer Part No. | CSTE08420 |
| Universal Product Code | 766759008420 |
| Invoice Description | FH CASS KMC GMX8-3 11-32 BK 8s |
| Shipping Weight | 0.70 lbs. |
| Package Dimensions | 6.1 x 6.15 x 2.15 |
| Country of Origin | TAIWAN |
| Range | 11-32t |
| Gears | 8sp |
| Cogs | 11,13,15,18,21,24,28,32 |
| Color | Black |
| Model | GMX8-3 |
- Supplier:
- JBI
Bike Junkies offers no‑hassle returns and exchanges within 60 days of delivery. We want every customer to feel confident when shopping with us, and our return process is designed to be simple, fair, and fast.
Return Eligibility
To qualify for a return or exchange, the following conditions must be met:
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The item must be in new, unused, and uninstalled condition.
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All original packaging, tags, hardware, and accessories must be included and intact.
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Items showing wear, installation marks, damage, or improper use cannot be accepted.
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An order number is required.
Once your return is received at our warehouse, a refund will be issued within 5 days after inspection.
Refunds
Refunds are issued to the original form of payment once the returned item has been received and approved. If we are unable to refund to the original payment method, the refund will be issued as store credit.
Depending on your bank or credit card provider, it may take an additional 2–3 business days for the refund to appear in your account.
Exchanges
To make an exchange, simply complete the return process and then place a new order for the item you want instead. This ensures the replacement item is reserved and ships quickly.
How to Start a Return
To request a Return Authorization (RA#), contact us at support@bikejunkies.com. Please include your order number and the item you wish to return.
Once approved:
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You will receive a Return Authorization email with instructions.
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Print the prepaid label provided by us. ($9.99 will be deducted from your refund)
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Ship the item back within 7 days of the RA being issued as RA #'s are only valid for 7 days.
Please do not tape anything to the original product packaging. Place the item inside a proper shipping box. Using the manufacturer’s box as the shipping container will result in damage and the return may be rejected.
Be sure to keep your return tracking number. Powersport Junkies is not responsible for lost return shipments. You will receive a confirmation email once your return has been processed and refunded.
Defective, Incorrect, or Damaged Items
If you receive a defective, damaged, or incorrectly shipped item, contact us immediately. We will cover the return shipping cost and ensure the issue is resolved quickly.
Non‑Returnable Items
Certain items cannot be returned, including:
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Electronics with opened packaging or broken manufacturer seals
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Any part that has been installed or shows installation attempts
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Tools or chemicals that have been opened or unsealed
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Open‑box items with destroyed or missing packaging
Our Info
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Storefront name: Bike Junkies
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Address: 940 Calle Amanecer, Suite N
San Clemente, CA 92673 -
Phone: 800-605-2152
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Support email: support@bikejunkies.com
- Support hours + timezone:
Monday-Friday: 9:00 AM-5:00 PM PST
Saturday: 9:00 AM-3:00 PM PST
Sunday: Closed
This Shipping Policy explains how orders are processed, handled, and delivered by Bike Junkies, including delivery timelines, shipping coverage, and special conditions for military addresses. It is designed to give customers a clear understanding of what to expect when placing an order.
Bike Junkies is proud to be an authorized dealer of the brands we currently offer. When you purchase from us, you are guaranteed to receive genuine, brand-new products backed by the full manufacturer warranty. We work directly with the manufacturers to ensure you receive the highest quality service and support.
Order Processing and Handling
Orders are processed quickly to ensure fast delivery. Our standard handling time is 0–1 business days. Order cutoff time is 12 PM PST Monday-Friday and orders placed after that will be shipped shipped next business day.
Transit Times
Once shipped, orders typically arrive within 2–3 business days. Transit times may vary slightly depending on the destination, weather conditions, or carrier-related delays. Delivery estimates apply only after the order has left our facility.
Delivery Schedule
Standard delivery occurs Monday through Friday. Saturday delivery may be available.
Shipping Coverage
Bike Junkies offers free shipping to the lower 48 states of the United States. We do not ship to the following locations:
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Alaska
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Hawaii
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Puerto Rico
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Any international destination outside the United States
Orders placed with shipping addresses in restricted locations will be canceled and refunded.
Military Shipping (APO/FPO)
Bike Junkies ships to APO/FPO military addresses using USPS only.
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We cannot ship hazardous materials or oversized items to military addresses due to carrier and military mail restrictions.
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Transit times to APO/FPO locations may vary significantly depending on military mail processing.
Address Accuracy and Delivery Issues
Customers are responsible for ensuring that all shipping information provided at checkout is accurate and complete. Bike Junkies is not responsible for delays, lost packages, or delivery failures caused by incorrect or incomplete addresses. If a package is returned due to an address error, additional shipping charges may apply to resend the order.
Lost, Delayed, or Damaged Shipments
If a shipment is delayed, lost, or arrives damaged, customers should contact us promptly so we can assist with initiating a claim or resolving the issue with the carrier. While we support the process, final decisions regarding claims are made by the carrier.
Tracking Information
A tracking number is provided via email once the shipping label has been created. Tracking updates may take up to 24 hours to appear after the label is generated.
Shipping Restrictions
Certain items may be subject to shipping restrictions due to size, weight, or hazardous material regulations. If an order cannot be shipped due to such restrictions, we will notify the customer to arrange an alternative solution.
Our Info
-
Storefront name: Bike Junkies
-
Address: 940 Calle Amanecer, Suite N
San Clemente, CA 92673 -
Phone: 800-605-2152
-
Support email: support@bikejunkies.com
- Support hours + timezone:
Monday-Friday: 9:00 AM-5:00 PM PST
Saturday: 9:00 AM-3:00 PM PST
Sunday: Closed
For warranty issues please contact us at support@bikejunkies.com. Each Brand is different and we can provide instruction to complete warranty issues.
Bike Junkies is proud to be an authorized dealer of the brands we currently offer. When you purchase from us, you are guaranteed to receive genuine, brand-new products backed by the full manufacturer warranty. We work directly with the manufacturers to ensure you receive the highest quality service and support.
Our Info
-
Storefront name: Bike Junkies
-
Address: 940 Calle Amanecer, Suite N
San Clemente, CA 92673 -
Phone: 800-605-2152
-
Support email: support@bikejunkies.com
- Support hours + timezone:
Monday-Friday: 9:00 AM-5:00 PM PST
Saturday: 9:00 AM-3:00 PM PST
Sunday: Closed
