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SHIMANO Alivio RD-M3100 Rear Derailleur - 9-Speed, Long Cage

Q: Is this compatible for 8 speed?

Not perfectly - the m3100 model is really meant for 9 speed

Q: Will this replace the stx rc on a Trek 7300 8 speed?

Shimano's Compatibility charts won't show this "9-speed" derailleur as compatible with 8-speed components, but it should work just fine. Shimano 8-speed shifters will work. This RD can handle larger cogs than were common in the 8-speed era, up to 36t largest cog, but assuming you have 11-32 it'll work. I have an stx rc RD on one of my bikes, and wouldn't hesitate to try this as a replacement.

4.5/5

Product ID: 351880891

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Details

Brand
SHIMANO
Colour
Black
Item Weight
200 Grams
Case Material Type
Aluminium
Mounting Type
Clamp-On Mount

🔧45T chain wrap capacity

⚙️9-speed precision shifting

🛡️Shadow RD tech for derailleur protection

Frequently Bought Together

Shimano,Black,ERDM3100SGS Alivio Alivio M3100 Rear derailleur, 9-Speed, Shadow Design, SGS Long cage

SHIMANO Alivio SL-M3100 Alivio Shift Lever, 9-Speed, Band on, Right Hand,Black

Description

⚡ Shift like a pro, conquer every trail.

LONG CAGE CAPACITY - Handles up to 45 teeth for versatile gearing on steep climbs and fast descents.
LIGHTWEIGHT COMPACT - At just 0.4 kg and a sleek 15 cm profile, it’s built for speed without bulk.
DIRECT MOUNT STABILITY - Shimano Rear Direct Mount ensures a secure fit and enhanced drivetrain performance.
TRAIL READY DURABILITY - Shadow RD tech keeps your derailleur safe from rocks and roots, so you never miss a beat on rugged trails.
SMOOTH 9 SPEED SHIFTING - Experience crisp, reliable gear changes that keep your ride fluid and efficient.

The Shimano Alivio RD-M3100 Rear Derailleur is a 9-speed, long cage component featuring Shadow RD technology for low-profile protection against trail obstacles. With a 45-tooth chain wrap capacity and Shimano’s direct mount system, it delivers reliable, smooth shifting and durability for serious mountain biking.

Specifications

Number of Teeth	45
Manufacturer	Shimano
UPC	192790621159
Batteries Included	No
Length	15 Centimeters
Width	15 Centimeters
Height	10 Centimeters
Weight	0.4 Kilograms

Have a Question? See What Others Asked

sirve para 2x9 de 11-40?

Is this compatible for 8 speed?

Will this replace the stx rc on a Trek 7300 8 speed?

Does it come with the hanger bolt?

Common Questions

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