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 GMX11-5 11-50t Cassette - Precision Engineering for Adventurous Riders
Optimize your mountain bike or gravel bike setup with the KMC GMX11-5 Cassette, a high-performance, meticulously engineered drivetrain component designed for demanding riders who seek durability, smooth shifting, and versatile gear options. With a broad 11-50 tooth range, this 11-speed cassette ensures you're prepared for steep climbs, rapid descents, and versatile terrains.
Materials & Durability
Constructed from high-strength steel, the KMC GMX11-5 cassette offers exceptional durability and long-lasting performance. Engineered to withstand rigorous riding conditions, it resists wear and corrosion, guaranteeing reliable shifting mile after mile, season after season.
Performance & Engineering
The REACT series cassette features innovative ascent and descent ramps, perfectly calibrated to provide seamless and precise chain guidance throughout the entire gear range. This meticulous design reduces friction and enhances overall drivetrain efficiency, allowing for smoother, quicker shifts whether climbing or descending. The carefully designed cogs, featuring optimized sizes like 11, 13, 15, 18, 21, 24, 28, 32, 36, 42, and 50 teeth, deliver consistent power transfer and improved chain retention.
Components & Technology
Compatible with Shimano HG freehub bodies (8-11 speed), the GMX11-5 cassette integrates seamlessly into a wide variety of modern drivetrains. Its unique lifting and lowering ramps optimize chain movement, improve shifting responsiveness, and reduce drivetrain stress. Designed specifically to match KMC's REACT series chains, the cassette ensures perfect synergy for enhanced performance and longevity.
Style & Use Case
Designed in classic black for a sleek, understated look, the KMC GMX11-5 cassette is ideal for mountain biking, gravel riding, and bikepacking adventures. Its versatile gear range allows riders to conquer steep climbs, accelerate on flats, and descend confidently. Whether tackling technical trails or extended gravel routes, this cassette provides the dependable, smooth shifting performance you need.
Innovative Features & Differentiators
- Optimized gear ratio progression for smoother shifting and better cadence management
- Precise ascent/descent ramps for quick chain engagement and reliable chain retention
- Compatible with popular 11-speed setups and KMC chains like e11, X11, X11 EL, and X11 SL
- Robust steel construction ensures durability in rugged riding conditions
- Broad gear range (11-50t) ideal for varied terrains and climbing challenges
Take your bike's performance to the next level with the KMC GMX11-5 Cassette - engineered for durability, smooth shifting, and versatility across all trail adventures. Equip your bike with this high-grade component and experience enhanced efficiency on every ride.
Specifications:
- Range: 11-50 teeth
- Cogs: 11, 13, 15, 18, 21, 24, 28, 32, 36, 42, 50 teeth
- Compatibility: Shimano HG freehub bodies (8-11 speed)
- Material: High-strength steel
- Weight: 802 grams
- Color: Black
Enhance your drivetrain with the trusted performance of KMC's GMX11-5 Cassette - built for riders who demand excellence.
- High-precision engineering with the KMC GMX11-5 Cassette, crafted from high-strength steel for durability and long-lasting performance on rugged mountain trails and competitive racing.
- Optimized for Shimano HG freehub compatibility (8-11 speed), this 11-50t cassette provides a wide gear range, enabling effortless climbing and high-speed descents across varied terrains.
- Innovative ascent and descent ramps ensure smooth, precise shifting performance, reducing chain slippage and enhancing overall drivetrain efficiency for riders who demand reliability and speed.
- Designed to match KMC's REACT series chains, this cassette features meticulously engineered cogs and optimized spacing for seamless chain engagement, minimizing friction and maximizing drivetrain lifespan.
- Stylish black finish complements any bike setup, while the versatile 11-speed configuration makes it suitable for both aggressive mountain biking and endurance rides, delivering versatile performance in any cycling scenario.
| Specification | Value |
|---|---|
| Manufacturer | KMC |
| Manufacturer Part No. | CSTE00547 |
| Universal Product Code | 766759000547 |
| Invoice Description | FH CASS KMC GMX11-5 11-50 BK 11s |
| Shipping Weight | 2.15 lbs. |
| Package Dimensions | 9.65 x 9.15 x 1.75 |
| Country of Origin | TAIWAN |
| Range | 11-50t |
| Gears | 11sp |
| Cogs | 11,13,15,18,21,24,28,32,36,42,50 |
| Color | Black |
| Model | GMX11-5 |
- 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
