About The Product
- Sunrace replacement twist shifters
- Shimano/Sram MRX compatible pull ratio
- Available in Friction, 3,5,6,7, and 8 speed options
Upgrade Your Ride with the Sunrace TSM21 Twist Shifter - 8-Speed Indexed Gear Control in Stylish Gray
Experience smooth, precise shifting performance with the Sunrace TSM21 Twist Shifter, expertly engineered for cyclists seeking reliable gear changes and enhanced ride control. Designed to seamlessly integrate with Shimano-compatible 8-speed drivetrains, this high-performance rear derailleur shifter combines innovative technology with user-friendly features to elevate your cycling experience.
Materials & Construction
Crafted with lightweight, durable materials, the Sunrace TSM21 Twist Shifter weighs just 90 grams, ensuring minimal added weight to your bike. The galvanized cable ensures superior corrosion resistance and longevity, even in challenging weather conditions, offering consistent performance ride after ride. The sleek gray finish complements a variety of bike styles, making it a versatile addition to your cycling setup.
Performance & Engineering
Featuring a 2:1 gear ratio and an easy-to-use twist design, this shifter provides light action shifting for quick, accurate gear changes with minimal effort. The integrated gear indicator clearly displays your current gear position, allowing for quick adjustments on the fly. Compatible with Shimano drivetrains, the TSM21 ensures smooth, reliable shifts across all 8 sprockets, optimizing your pedaling efficiency and ride comfort.
Components & Technology
The TSM21 model incorporates advanced cable adjuster technology for fine-tuning cable tension and responsiveness, enhancing shift precision. Its ergonomic design allows for comfortable handling during long rides, while the galvanized internal cables deliver a consistent, crisp shifting experience over time.
Style & Use Case
Designed for rear derailleur control, the Sunrace TSM21 Twist Shifter is perfect for mountain biking, commuter bikes, and touring setups where accurate, responsive gear changing is essential. Its compact, lightweight profile and stylish gray finish make it suitable for both casual riders and competitive cyclists seeking a sleek, functional upgrade.
Innovative & Differentiating Features
- Light action twist mechanism for effortless shifting
- Cable adjuster for precise tension control
- Durable galvanized cable for corrosion resistance
- Clear gear indicator for quick reference
- Compatible with Shimano 8-speed drivetrains
Enhance your cycling performance with the Sunrace TSM21 Twist Shifter-designed to deliver precise gear control, durability, and style for every rider. Optimize your bike's shifting system today for a smoother, more enjoyable ride.
- Precision Gear Shifting with 8-Speed Indexing for Reliable Performance, the Sunrace TSM21 Twist Shifter is engineered to seamlessly work with Sunrace and Shimano derailleurs, ensuring smooth and accurate gear changes. Constructed with high-quality galvanized cable for enhanced durability and corrosion resistance, delivering long-lasting performance in all cycling conditions. Featuring a lightweight design at just 90g and a sleek gray finish, this twist shifter offers ergonomic handling and stylish appeal for mountain biking, commuter riding, or recreational cycling. The intuitive gear indicator provides clear feedback on your current gear, optimizing shifting confidence and efficiency. Ideal for versatile rear derailleur setups, the TSM21 is perfect for cyclists seeking reliable, easy-to-use shifting technology with innovative cable adjustment features.
| Specification | Value |
|---|---|
| Manufacturer | SUNRACE |
| Manufacturer Part No. | TSM21.R80S.GS0.HP |
| Universal Product Code | 4710944250206 |
| Invoice Description | SHIFTER SUNRACE HB TSM21 TWIST 8s RH GY |
| Shipping Weight | 0.26 lbs. |
| Package Dimensions | 10 x 6.35 x 2.15 |
| HTS Number | 8714.99.5000 |
| Country of Origin | TAIWAN |
| Type | TSM21 |
| Left/Right/Pair | Right |
| Speeds | 8sp |
| Ratio | 2 to 1 |
| Color | Blk/Gry |
- 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
-
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
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
