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SunRace RDM91 9-Speed Long Cage Rear Derailleur for MTB and Road Bikes
✓ 9-speed rear mech for Shimano and SRAM drivetrains
✓ Long cage compatible with 11-34 tooth cassettes
✓ Reinforced steel structure for maximum durability
✓ Pulleys with bushings for smooth gear shifts
✓ Total capacity 43 teeth for wide-range gearing
✓ Lightweight at approx. 340g
✓ Universal direct mount hanger attachment
✓ Perfect for entry-level mountain bikes and city bikes
SunRace RDM91 9-Speed Long Cage Rear Derailleur - Budget MTB Mech
The SunRace RDM91 rear derailleur represents the perfect choice for cyclists seeking a reliable and affordable 9-speed rear mech. Specifically designed for entry-level mountain bikes, urban trekking bikes and city bikes, this long cage derailleur ensures precise gear shifts without breaking the bank.
Technical specifications SunRace RDM91 mech:
✓ Complete compatibility: Works with all 9-speed Shimano and SRAM shifters
✓ Durable long cage: Accepts cassette sprockets from 11 to 34 teeth
✓ Solid construction: Reinforced stamped steel main structure
✓ Pulley system: Quiet self-lubricating bushing wheels
✓ Large capacity: 43 teeth total for triple front chainring management
✓ Chain tensioning: Calibrated spring for optimal tension
✓ Easy mounting: Standard direct mount for all frames
✓ Reasonable weight: 340 grams to keep the bicycle light
Benefits of the budget SunRace RDM91 derailleur:
This entry-level rear mech offers surprising performance for its low price. SunRace technology ensures long-term reliability, while the robust construction withstands daily use on mixed terrain. The long cage allows versatile configurations, from steep mountain bike climbs to relaxed city cycling.
Applications and 9-speed mech compatibility:
The RDM91 derailleur pairs perfectly with Shimano Altus, Acera, Alivio and SRAM X3, X4 groupsets. Installation requires only standard tools and can be completed in minutes. Limit screw and cable tension adjustments follow industry standards, making maintenance accessible to everyone.
Recommended use:
- Budget and entry-level mountain bikes
- Trekking and light touring bicycles
- City bikes and urban bikes with wide-range gearing
- First upgrade for bikes with damaged derailleur
- Custom bike projects on limited budget
Comparison with other 9-speed derailleurs:
Compared to premium models, the RDM91 offers solid performance while sacrificing only premium finishes. The bushing pulleys instead of bearings require more frequent lubrication but guarantee years of reliable service. The higher weight compared to aluminium models is balanced by the affordable price and superior durability.
Rear derailleur maintenance tips:
Clean regularly with bike-specific degreaser. Lubricate pulleys every 300-400 km with chain oil. Check wheel wear every 3000 km. Verify hanger alignment after falls or impacts. With proper care, this derailleur will last thousands of kilometres.
Why buy from Mognetti Bike:
2-year warranty on all SunRace components. Specialist technical support pre and post sale. Fast shipping with tracking in 24-48 hours. 30-day return possibility. Competitive prices and exclusive offers for loyal customers.
Order now the SunRace RDM91 derailleur and receive our free derailleur maintenance manual. Limited stock, take advantage of the special offer valid online only!
By placing the order before 12.00 (GMT +1) working, from Monday to Friday, we guarantee the delivery of the package to the courier the same day and sometimes it is also possible with orders received later . In the event of holidays or changes to the order, delivery will be postponed to the next working day.
All shipping services have a tracking code that is sent in email after shipment with which it will be possible to follow the status (for some services the code will be active 24 hours after shipment).
Accepted payments:
- all major credit cards
- Paypal
- bank transfer
How can I make a return?
You can return your order within 30 days, starting from the day of receipt of the package - Excluding E-bikes and bicycles in general for which the manufacturer's warranty
Returning is very simple:
- Send us an email to shop@mognettibike.it with your details and order number
- We will then send you an email with the return number.
- Enter your order number and follow the procedure
- Prepare your shipment using the original packaging
- If you are unable to print the form, insert in the package a sheet with the details of the order holder (name-surname and order number).
- Close the box carefully
- We will send you an e-mail confirming how the package will arrive at our warehouse
Do I have to pay the return?
The return is free with the exception of E-Bikes and bicycles in general for which the manufacturer's warranty applies.
How and when will I receive the amount of my return?
Once the return has been approved, the refund will be made in the same way you paid, within 30 days of receiving the package at our offices.
For more information see the following page returns and refunds
How can I make a return?
You can return your order within 30 days, starting from the day of receipt of the package - Excluding E-bikes and bicycles in general for which the manufacturer's warranty
Returning is very simple:
- Send us an email to shop@mognettibike.it with your details and order number
- We will then send you an email with the return number.
- Enter your order number and follow the procedure
- Prepare your shipment using the original packaging
- If you are unable to print the form, insert in the package a sheet with the details of the order holder (name-surname and order number).
- Close the box carefully
- We will send you an e-mail confirming how the package will arrive at our warehouse
Do I have to pay the return?
The return is free with the exception of E-Bikes and bicycles in general for which the manufacturer's warranty applies.
How and when will I receive the amount of my return?
Once the return has been approved, the refund will be made in the same way you paid, within 30 days of receiving the package at our offices.
For more information see the following page returns and refunds
