A replacement derailleur must match more than the number of gears. Shifter compatibility, chain capacity and cassette range affect the choice.
Choose a part that fits your bike
Bring the shifter and derailleur model numbers, cassette range and number of front chainrings. The hanger should be checked because a bent hanger can also cause poor shifting.
Send John a photo of the part, its markings or your bike. He can help check the details before you decide what to buy.
Browse available products
Availability updated Oct 16, 11:01 pm EDT.
Shimano XT RD-M8000-GS Rear Derailleur - 11 Speed, Medium Cage, Black, With Clutch
$130.00
Shimano Sora RD-R3000-GS Rear Derailleur - 9 Speed, Medium Cage, Black
$55.00
Shimano Altus RD-M370-SGS Rear Derailleur - 9 Speed, Long Cage, Black
$40.00
SRAM NX Rear Derailleur - 11 Speed, Long Cage, Black
$99.00
SRAM GX Rear Derailleur - 11 Speed, Long Cage, Black, 1x, With Clutch
$150.00
DER SRAM RR FORCE1 TYPE3.0 SHORT CAGE 11s GY 28T MAX COG
$225.00
RR MECH M4120 Deore 10/11spd Shadow SGS
$50.00
Rear Der Shimano Deore M591 Sgs Black
$70.00
REAR DER, RD-M370-S, ALTUS, SGS 9-SPEED, DIRECT ATT
$35.00
Shimano 105 RD-R7000-SS Rear Derailleur - 11-Speed, Short Cage, Black
$72.00
Shimano Tiagra RD-4700-GS Rear Derailleur - 10 Speed, Medium Cage, Silver
$80.00
The part—and help installing it
Work directly with John, an owner-mechanic with 35 years of bicycle repair experience. If you need installation or a diagnosis, bring the bike so the repair can be evaluated as a whole. Parts and installation labor are priced separately.
Text John about 9–11-speed bicycle derailleurs · Call 207-248-9862
Explore related bicycle repair services · Browse parts and accessories
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7 Granite St, Augusta, Maine. Monday–Thursday, 10 a.m.–5 p.m.; Friday by appointment. Two driveway parking spots, street parking and step-free entry. Cash, checks and credit cards accepted.
