About The Product
- Replacement E-Bike chainrings for Bosch Gen 3 and 4 drivetrains
- New tooth design provides vastly improved chain retention and interface
- Gen 3 and 4 available in multiple tooth counts, and multiple chainlines for Gen 4 chainrings
Boost your e-bike's performance with the KMC E-Bike Sprocket 38T 52mm Chainline, designed for seamless integration with Bosch Gen 3 and 4 drivetrains. Crafted from high-quality materials, this direct-mount sprocket ensures exceptional durability and reliable power transfer essential for daily commuting and mountain biking adventures.
Materials & Construction:
Manufactured from premium-grade steel, the KMC 38T chainring features a robust construction that withstands the rigors of aggressive riding and challenging terrains. The sleek black finish not only adds a stylish touch but also provides resistance against corrosion and wear.
Performance & Engineering:
Engineered with an innovative tooth design, this e-bike sprocket significantly enhances chain retention and engagement, reducing the risk of chain slippage during intense riding sessions. The 52mm chainline optimizes pedal efficiency and drivetrain compatibility, ensuring smooth power delivery across various bike setups.
Components & Technology:
Utilizing direct-mount technology, this 38-tooth chainring integrates effortlessly with Bosch Gen 3 and 4 e-bike systems, including multiple chainlines tailored for Gen 4 variants. Its compatibility with 1/2x11/128 chains ensures broad application across popular e-bike configurations. The standard tooth profile guarantees precise shifting and long service life.
Style & Use Case:
Designed for e-bike enthusiasts seeking reliability, style, and enhanced performance, the KMC E-Bike Sprocket 38T is perfect for mountain biking, urban commuting, and trail riding. Its sleek black aesthetic complements any e-bike frame, elevating both look and functionality.
Innovative Features:
The updated tooth design provides vastly improved chain retention, minimizing maintenance and maximizing riding confidence. Whether upgrading an existing setup or building a new e-bike, this sprocket offers a superior combination of technology, durability, and style.
Upgrade your e-bike with the KMC 38T 52mm Chainline Sprocket - the perfect choice for reliable, high-performance riding. Optimize your drivetrain today for smoother acceleration, enhanced efficiency, and a more responsive ride.
- Optimized for Bosch Gen 3 and 4 e-bike drivetrains, this KMC E-Bike Sprocket 38T features a durable, high-strength steel construction ensuring long-lasting performance and reliable power transfer.
- Designed with a precision-engineered tooth profile, this chainring provides vastly improved chain retention, reducing drops and enhancing shifting stability during intense riding conditions.
- Built with a direct mount interface and a 52mm chainline, the sprocket ensures seamless compatibility with Bosch e-bike systems, optimizing gear engagement and smooth pedal response.
- Ideal for e-bike riders seeking enhanced durability and efficiency, this sprocket is suitable for various riding styles, from urban commuting to rugged trail adventures, with multiple tooth counts and chainline options available.
- Incorporating innovative engineering and compatibility with 1/2x11/128 chain standards, the KMC E-Bike Sprocket delivers top-tier performance with easy installation and superior engagement, making it a must-have upgrade for Bosch-powered e-bikes.
| Specification | Value |
|---|---|
| Manufacturer | KMC |
| Manufacturer Part No. | RING00455 |
| Universal Product Code | 766759000455 |
| Invoice Description | CHAINRING EBIKE KMC BOSCH-GEN4 38T 52.0mm HAIN LINE BK |
| Shipping Weight | 0.26 lbs. |
| Package Dimensions | 8.9 x 7.4 x 0.3 |
| Country of Origin | TAIWAN |
| Mount Compatibility | Direct Mount |
| Teeth | 38T |
| Type | 52mm Chainline |
| Color | Black |
| Chain Compatibility | 1/2x11/128" |
| Tooth Type | Standard |
- 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
