About The Product
- 7/8-speed MTB rear derailleur
- Engineered polymer and steel construction
- Not compatible with Shimano MegaRange cassettes
- SHIMANO Equivalent RD-M360 / RD-M410 / RD-M310 / RD-M280
- Removable hanger included for use with direct mount or hanger mount
Upgrade your mountain biking performance with the Sunrace RDM57 Rear Derailleur - a reliable, durable, and high-performance component designed for 7/8-speed drivetrains. Built with precision engineering, this long cage derailleur delivers smooth, accurate shifting across a wide gear range, making it ideal for aggressive trail riding, XC racing, and versatile mountain biking applications.
Materials & Construction:
Constructed from high-quality aluminum and steel, the Sunrace RDM57 ensures long-lasting durability and resistance to the rigors of off-road riding. Its engineered polymer and steel components contribute to a lightweight design without sacrificing strength, weighing just 355 grams for optimal performance and maneuverability.
Performance & Engineering:
Featuring a 2:1 actuation ratio compatible with most Shimano 3x7/8-speed drivetrains, the RDM57 offers precise and responsive gear shifts, even under demanding riding conditions. Its 11-tooth pulleys optimize chain stability and efficiency, improving power transfer and reducing drivetrain wear. With a maximum capacity of 43T, it accommodates a broad range of cassette sizes from 11T to 34T, providing versatility for various gearing setups.
Components & Technology:
This derailleur boasts a robust long cage design, making it suitable for bikes with larger gear ratios and mountain terrain. The inclusion of a barrel adjuster allows for fine-tuning shifting performance, ensuring smooth gear transitions across all gears. Note: Not compatible with Shimano MegaRange cassettes, but it is comparable to Shimano RD-M360, RD-M410, RD-M310, and RD-M280 models.
Style & Use Case:
Designed in a sleek black finish, the Sunrace RDM57 seamlessly integrates with mountain bike aesthetics while offering rugged performance. Its standard 10x1 mount type makes installation straightforward on most mountain bikes. The removable hanger option provides flexibility for direct mount or hanger mount setups, enhancing compatibility with various frame designs.
Innovative Features:
- Wide gear range suitability with a 43T capacity
- Compatibility with 7/8-speed mountain bike drivetrains
- Durable aluminum and steel construction for off-road resilience
- Precise 2:1 actuation ratio for cleaner, more reliable shifts
- Removable hanger for versatile mounting options
Maximize your mountain biking adventures with the Sunrace RDM57 Rear Derailleur - engineered for durability, precision, and versatility. Whether tackling rugged trails or alpine climbs, this derailleur ensures confident shifting and smooth ride quality every time.
- High-performance 7/8-speed rear derailleur designed for mountain biking and hybrid cycling applications, suitable for use with Shimano 3x drivetrains for seamless gear shifting.
- Constructed from durable aluminum and steel materials, this derailleur offers excellent strength, corrosion resistance, and lightweight performance, ensuring long-lasting reliability on rugged trails.
- Features advanced 2:1 actuation ratio and 11-tooth pulleys for precise, smooth shifting performance, optimized for tactical control and enhanced drivetrain efficiency across a wide gear range.
- Equipped with a long cage and capacity for up to 43 teeth, this derailleur accommodates wide-range cassettes (11-34t) for versatile riding styles, including climbing steep gradients and high-speed descents.
- Includes a removable hanger for easy installation and compatibility with direct mount or hanger mount frames, making it a versatile upgrade for mountain bikes seeking reliable performance and style.
| Specification | Value |
|---|---|
| Manufacturer | SUNRACE |
| Manufacturer Part No. | RDM57.LDB0.0S1.BX |
| Universal Product Code | 4710944257373 |
| Invoice Description | DER SUNRACE RDM57 SGS 7/8s DIRECT BK (L) |
| Shipping Weight | 0.91 lbs. |
| Package Dimensions | 6.85 x 4.15 x 3.8 |
| HTS Number | 8714.99.5000 |
| Country of Origin | TAIWAN |
| Model | M57 |
| Speed | 7/8sp |
| Max | 34 |
| Wrap | 43 |
| Cage/Mount | Long |
| Ratio | 2to1 |
| Color | BLK |
| Wgt | 354g |
| Type | Mechanical |
- 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
