Are these items a universal for most bikes? I have a schwinn high timber 2.6 26" bike

No absolutely not check and make sure your part is same size and gear ratio.

Is this model a "long cage" ?

It is, but that is not necessarily helpful. It's always best to match the derailleur (or mech as they say across the pond) to the rear cassette.

is this considered a long or short derailleur

I'm not for sure,but the cog wheels are larger ones,some derailleurs have the smaller cog wheels,I would consider those longer,so I'm assuming this is the short one.

Does Shimano Acera m360 have a b-tension screw?

google images "Shimano Acera m360 b-tension screw" I think it does.

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Black Acera Rear Derailleur RD-M360

Product ID: 45274268

Details

Brand
SHIMANO
Color
Black
Item Weight
200 Grams
Material
Metal
Mounting Type
Braze-On Mount

🔧Compatible with Shimano 7 & 8-speed shifters

⚙️303g ultra-lightweight design

🚴‍♂️Max sprocket 34T for versatile gearing

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AED 496

Duties & taxes included

In stock

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Description

⚙️ Shift into the future with precision and style!

DIRECT FRAME FIT - Braze-on mount design for a clean, secure installation that complements your bike’s aesthetics.
LIGHTWEIGHT DURABILITY - Crafted from aluminum with a sleek black finish, balancing strength and minimal weight at just 303 grams.
VERSATILE COMPATIBILITY - Seamlessly fits all Shimano 7 & 8-speed shifters for effortless upgrades or replacements.
ENHANCED PERFORMANCE TECH - Megapulley oversize jockey wheel and Smartcage pulley plate reduce friction and boost drivetrain efficiency.
PRECISION SHIFTING MASTERY - SIS rear index shifting ensures smooth, reliable gear changes every ride.

The Shimano Black Acera Rear Derailleur RD-M360 is a lightweight, durable, and highly compatible drivetrain component designed for 7 & 8-speed city and mountain bikes. Featuring advanced shifting technology like SIS indexing, a megapulley oversize jockey wheel, and a smartcage pulley plate, it delivers smooth, efficient gear changes while weighing only 303 grams. Perfect for riders seeking reliable performance with a sleek, direct frame fit.

Specifications

ASIN	B0044DGH2E
Best Sellers Rank	#411,222 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #429 in Rear Bike Derailleurs
Brand Name	SHIMANO
Case Material Type	Aluminum
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (1,334)
Global Trade Identification Number	00744288844672
Included Components	Bicycle Pump
Item Dimensions L x W x H	1.57"L x 1.18"W x 2.36"H
Item Type Name	Rear Derailleur
Item Weight	200 Grams
Manufacturer	Shimano
Manufacturer Part Number	21721060
Material Type	Metal
Model Number	RDM360
Mount Type	Braze-On Mount
Number of Teeth	43
UPC	693595654712 744288844672 520307373565

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