Is this compatible for 8 speed?

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

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.

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🚴‍♂️ Shift into the future with Shimano’s stealthy, trail-proof drivetrain!

BUILT TO LAST - Backed by Shimano’s 2-year warranty, engineered for serious cyclists who demand performance.
TRAIL READY DURABILITY - Shadow RD design minimizes damage from trail obstacles, keeping your ride smooth and worry-free.
OPTIMIZED CHAIN STABILITY - SGS long cage maintains perfect chain tension, reducing chain drops and wear.
SLEEK LOW PROFILE DESIGN - Flat, compact build prevents snags and enhances bike aesthetics.
PRECISION 9 SPEED SHIFTING - HyperGlide system ensures crisp, reliable gear changes for every terrain.

The Shimano Alivio M3100 SGS rear derailleur features advanced Shadow RD technology and a long SGS cage for superior chain control and durability. Designed for 9-speed drivetrains with HyperGlide compatibility, it offers precise shifting and protection against trail impacts, making it ideal for trekking and trail cycling enthusiasts.

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Product Dimensions	6.69"L x 4.43"W x 3.94"H
Manufacturer	Shimano
UPC	192790621159
Item Package Dimensions L x W x H	7.83 x 4.72 x 4.21 inches
Package Weight	0.38 Kilograms
Item Dimensions LxWxH	6.69 x 4.33 x 3.94 inches
Brand Name	SHIMANO
Warranty Description	2 Year Manufacturer
Model Name	C8C086
Suggested Users	unisex
Number of Items	1
Part Number	ERDM3100SGS
Model Year	2021
Style	Single
Included Components	Bike Parts
Size	standard size
Sport Type	Cycling

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

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