Is the "medium" cage the ss or the gs version? shimano literature does not use the terms "short" or "medium" in their descriptions of the rd 8000.

medium is GS, short is SS for Shimano RD-8000 derailleurs. They cover 11-28T to 11-34T and 11-25T to 11-28T, respectively. See https://bike.shimano.com/en-EU/product/component/ultegra-r8000.html

is this for 10 speed ?

Actually, this will work with 10sp Tiagra. If you have ST-4700 levers (not sure about the MTB (flat bar) shifter version), then the pull ratio will work for and as 10sp on your 10sp cassette and shifter. You'll be future-proofed when you decide to switch out the lever, chain and cassette for actual 11sp. I am running ST-4700, RD-R8000GS, CS-MT771-10, CN-6701 (10sp) chain and everything works flawlessly.

El de tamaño M es el conocido como patilla larga ?

Sí, es lo mismo que pata larga.

What length of chain do I need with a medium cage?

Hi, we sell standard length: 116 link & you buy it & you have to cut yourself. if you need chain, we have it at my amazon store cycle4less asin #B00KQK5RAW. Bob

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⚡ Shift into the fast lane with Shimano Ultegra R8000!

SEAMLESS SHIFTING - Experience clean, whisper-quiet gear changes in all weather and terrain conditions.
RACE READY DURABILITY - Crafted from high-grade aluminium for long-lasting performance on every ride.
LIGHTWEIGHT EFFICIENCY - At just 318g, it balances strength and minimal weight for peak road racing agility.
SHADOW DESIGN ADVANTAGE - Ultra-flat Shimano Shadow construction reduces drag and protects from trail obstacles.
UNIVERSAL COMPATIBILITY - Perfectly pairs with Shimano derailleur gears to upgrade your bike’s drivetrain.

The SHIMANO Ultegra R8000 Rear Derailleur Medium Box is a precision-engineered, lightweight aluminium component designed for road racing bikes. Featuring Shimano’s Shadow construction for a sleek, low-profile fit, it ensures smooth, quiet shifting across all conditions. Weighing only 318 grams and measuring 9 cm in height, it offers durability and performance that meets the demands of serious cyclists.

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Manufacturer	SHIMANO
UPC	689228623156
Global Trade Identification Number	00689228623156, 04524667623151
Bike type	road racing
Color	graphite grey
Size	One Size
Height	9 centimetres
Item display length	15 centimetres
Weight	318 g
Item display width	12 centimetres
Material type	Aluminium
Number of items	1
Seasons	Autumn/Holiday
Sport	Cycling
Included components	nothing
Batteries included?	No
Department	Unisex
Item model number	C8C055
Product Dimensions	14.61 x 11.43 x 9.53 cm; 198 g
ASIN	B072MKT5NR

SHIMANOUltegra R8000 Rear Derailleur Medium Box

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