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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Shimano Black Acera Rear Derailleur RD-M360

Shimano 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

🔧Megapulley oversize jockey wheel

⚙️7 & 8-speed compatibility

🚴‍♂️Light action design for smooth shifting

€ 97.00

Duties & taxes included

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Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Shift into the future of smooth rides with Shimano Acera!

LIGHTWEIGHT YET DURABLE - Crafted from aluminum and metal components, weighing just 303 grams for agile performance.
DIRECT FRAME FIT WITH SMARTCAGE - Optimized design ensures easy installation and superior cage stability for consistent shifting.
MEGAPULLEY OVERSIZE JOCKEY WHEEL - Enhanced chain management reduces friction and boosts drivetrain efficiency.
SEAMLESS 7 8 SPEED INTEGRATION - Effortlessly compatible with all Shimano 7 & 8-speed shifters for versatile ride control.
PRECISION SHIFTING WITH SIS INDEXING - Experience crisp, reliable gear changes that keep you ahead on every trail and city street.

The Shimano Black Acera Rear Derailleur RD-M360 is a high-performance, lightweight rear derailleur designed for 7 and 8-speed mountain and city bikes. Featuring advanced light action design, SIS rear index shifting, and a megapulley oversize jockey wheel, it delivers precise, reliable gear changes. Its durable aluminum and metal construction weighs just 303 grams, making it ideal for riders seeking smooth control and efficiency on diverse terrains.

Specifications

ASIN	B0044DGH2E
Best Sellers Rank	#234,485 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #197 in Rear Bike Derailleurs
Brand Name	SHIMANO
Case Material Type	Aluminum
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (1,336)
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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