ITA | 
ENG
FREE SHIPPING STARTING FROM 89€
Fast delivery with express courier
30 DAYS MONEY BACK GUARANTEE
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!
Fast & Reliable Shipping in Italy
Place your order by 12:00 PM (GMT +1), Monday to Friday, and we’ll dispatch it the same business day. In many cases, we can process orders placed later as well.
If your order is placed on a public holiday or includes changes or special requests, shipping will be postponed to the next working day.
We ship exclusively with trusted express couriers. Estimated delivery times:
- 24 business hours for most mainland destinations
- Up to 48 hours for islands or remote areas
A tracking code will be sent by email once the order has shipped. In some cases, tracking may activate within 24 hours after dispatch.
All items are carefully packaged to ensure safe and secure delivery.
Accepted Payment Methods
- Major credit and debit cards
- PayPal
- Bank transfer
- Installment payments via Heylight (available only in Italy)
Buy Now, Pay Later with Heylight
For customers in Italy, we offer the option to split your purchase into monthly payments with Heylight. Simply select this option at checkout and complete the financing request via the secure Heylight portal. Approval is usually received within minutes. Once confirmed, we’ll ship your order immediately.
Need Help?
Send us a WhatsApp message (text only – no calls)
Returns and Refunds
How to Request a Return
You can return your order within 30 days from the delivery date, with the exception of E-Bikes and bicycles, which are covered by the manufacturer's warranty.
Returning a product is quick and easy. Just follow these steps:
- Email us at shop@mognettibike.it including your personal details and order number.
- You’ll receive a confirmation email with your return number and further instructions.
- Write your order number clearly and follow the provided return instructions.
- Use the original packaging to prepare your return.
- If you can't print the return form, include a note in the box with the name and order number of the purchaser.
- Seal the package carefully.
- We’ll send you a confirmation email as soon as the return arrives at our warehouse.
Is the Return Free?
Returns are free of charge for most products. However, E-Bikes and bicycles are excluded and fall under the manufacturer's warranty. Shipping for these returns may be at the customer's expense.
When Will I Receive My Refund?
Once your return is approved, we will issue a refund using the same payment method you used for your order. Refunds are processed within 30 days of receiving your returned item at our facility.
Need Help?
If you have any questions or need assistance, please contact our support team. We’re here to help.
For full details, visit our Returns and Refunds page.
-
-
Freewheel cassette 6S Threaded 14-28T Chromed Steel - Sunracewas €18.00 Special Price €14.00
