Would this work with a 42t cassette?

Shimano are listing the max sprocket size as 36T. You may be able to get it to work on a 42T with a hanger extender.

Will this work on an 8 speed cassette

It is designed for a 9 speed setup but should work fine on 8 speed also.

Would this work in 9 x 1 setup and how large can the cassette go?

Yes it should be fine on a 1 x 9 setup, the max sprocket on the Shimano website is 45T

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SHIMANO,Black,ERDM3100SGS Alivio Alivio M3100 rear derailleur, 9-speed, Shadow design, SGS long cage

Product ID: 216478948

Details

Brand
SHIMANO
Colour
Black
Item weight
0.2 Kilograms
Material
Aluminium
Mounting type
Shimano Rear

🖤Sleek black Shadow design

⚙️9-speed precision shifting

🛠️Durable steel & aluminum build

56180CFA

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Description

⚙️ Shift into the future with Shimano’s stealthy precision!

SGS LONG CAGE POWER - Optimized chain tension for superior performance on varied terrains.
LIGHTWEIGHT DURABILITY - Crafted from premium steel and aluminum for strength without the bulk.
SHADOW DESIGN ADVANTAGE - Low-profile, sleek black finish reduces snagging and boosts bike aesthetics.
TRUSTED SHIMANO QUALITY - Backed by a top-rated brand with 4.5-star reviews and proven reliability.
SEAMLESS 9 SPEED SHIFTING - Experience ultra-smooth gear transitions for every trail challenge.

The SHIMANO ERDM3100SGS Alivio M3100 rear derailleur is a 9-speed, long cage drivetrain component featuring a sleek Shadow design in black. Built from durable steel and aluminum, it offers smooth, reliable shifting and optimized chain management for mountain biking enthusiasts seeking performance and style.

Specifications

ASIN	B08CGYD213
Best Sellers Rank	6,968 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 4 in Bike Rear Dérailleurs
Brand Name	SHIMANO
Case Material Type	Steel & Aluminum
Colour	Black
Customer Reviews	4.5 4.5 out of 5 stars (690)
Global Trade Identification Number	04550170621155
Included Components	nothing
Item Dimensions L x W x H	17L x 11W x 10H centimetres
Item Type Name	MTB ALIVIO M3100 Rear Derailleur 3x9S Long Stick 45
Item Weight	0.2 Kilograms
Manufacturer	SHIMANO
Manufacturer Part Number	ERDM3100SGS
Manufacturer Warranty Description	producer
Material Type	Aluminium
Model Number	C8C086
Mount Type	Shimano Rear Direct Mount
Number of Items	1
Number of Teeth	36
UPC	192790621159
Unit Count	1.0 count

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TrustScore 4.5 | 7,300+ reviews

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56180CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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