Sunrace RDM900 9-Speed Rear Derailleur Medium
The Sunrace RD-M900 Rear Derailleur 9 Speed is an excellent choice for your 1x9 or 2x9 speed setup. The adjustable chain stabilizer helps to increase the effecenty of chain engagement and response for smoother shifting overall. The cage and links are built to last without plastic. The Minimum teeth is 11t. The maximum rear sprocket size is 50 with a 1x setup and 46t with a 2x setup. Available in Black.
The Sunrace RD-M900 Rear Derailleur 9 Speed is an excellent choice for your 1x9 or 2x9 speed setup. The adjustable chain stabilizer helps to increase the effecenty of chain engagement and response for smoother shifting overall. The cage and links are built to last without plastic. The Minimum teeth is 11t. The maximum rear sprocket size is 50 with a 1x setup and 46t with a 2x setup. Available in Black.
The Sunrace RD-M900 Rear Derailleur 9 Speed is an excellent choice for your 1x9 or 2x9 speed setup. The adjustable chain stabilizer helps to increase the effecenty of chain engagement and response for smoother shifting overall. The cage and links are built to last without plastic. The Minimum teeth is 11t. The maximum rear sprocket size is 50 with a 1x setup and 46t with a 2x setup. Available in Black.
The Sunrace RD-M900 Rear Derailleur 9 Speed is an excellent choice for your 1x9 or 2x9 speed setup. The adjustable chain stabilizer helps to increase the effecenty of chain engagement and response for smoother shifting overall. The cage and links are built to last without plastic. The Minimum teeth is 11t. The maximum rear sprocket size is 50 with a 1x setup and 46t with a 2x setup. Available in Black.
in 9 offers
The lowest price for Sunrace RDM900 9-Speed Rear Derailleur Medium right now is $56.99 at Techinn.com, compared across 6 retailers.
The all-time low was $37.99 on 15 Nov 2025 — today's price is 50% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 1 Oct 2026.
Last updated at 01/10/2026 05:06:33
SunRace Type: Uni 305830885 Mozz R.Libera Adaptor
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Sunrace Mtb Rdm900 Rear Derailleur Black 9s / Max 51t
Sunrace M900 Rear Derailleur - 9-speed
Delivery $12
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
SUNRACE 305830885 Adattatore R.Libera di Mozz Unisex Adulto Nero Taglia Unica
Delivery $11.43
SUNRACE - Derailleur 9s
Free delivery
SunRace M900 Rear Derailleur - 9-Speed Medium Cage Black Shimano Rear
Free delivery
originally posted on fortnine.ca
Had no issues with this derailleur, it's nice and quiet, shifts fast on a sunrace csm990 11-40t cassette using an altus 9spd Shimano shifter and a kmc x9 chain. Very nice but not sure about longevity as I've only had it out for a day long ride but no issues and clutch works great.
| Cage | Medium |
| Rear gears | 9-speed |
| Max. teeth large sprocket | 51T (with 1x9-speed) |
| Min. teeth small sprocket | 11T |
| Total Capacity | 40T |
SunRace Type: Uni 305830885 Mozz R.Libera Adaptor
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Sunrace Mtb Rdm900 Rear Derailleur Black 9s / Max 51t
Sunrace M900 Rear Derailleur - 9-speed
Delivery $12
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
SUNRACE 305830885 Adattatore R.Libera di Mozz Unisex Adulto Nero Taglia Unica
Delivery $11.43
SUNRACE - Derailleur 9s
Free delivery
Had no issues with this derailleur, it's nice and quiet, shifts fast on a sunrace csm990 11-40t cassette using an altus 9spd Shimano shifter and a kmc x9 chain. Very nice but not sure about longevity as I've only had it out for a day long ride but no issues and clutch works great.
| Cage | Medium |
| Rear gears | 9-speed |
| Max. teeth large sprocket | 51T (with 1x9-speed) |
| Min. teeth small sprocket | 11T |
| Total Capacity | 40T |
