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 like a pro, ride like a legend.

SEAMLESS INTEGRATION - Perfectly pairs with Ultegra R8000 and Dura-Ace R9100 for pro-level performance.
COMPACT MEDIUM CAGE DESIGN - Balances chain tension and shifting speed for a flawless ride every time.
PRECISION SHIFTING MASTERY - Experience ultra-smooth gear changes with Shimano’s renowned engineering.
WIDE CASSETTE COMPATIBILITY - Optimized for 11-30T or 11-34T cassettes to conquer any terrain.
LIGHTWEIGHT ALLOY CONSTRUCTION - Durable yet featherlight design keeps your ride fast and responsive.

The Shimano Ultegra R8000 Rear Derailleur Medium Box is a precision-engineered alloy component designed for double chainring setups. Compatible with Shimano Ultegra R8000 and Dura-Ace R9100 groupsets, it supports cassette ranges from 11-30T to 11-34T, delivering smooth, reliable shifting with a lightweight, durable build ideal for serious cyclists seeking performance and versatility.

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Manufacturer	Shimano
UPC	689228623156
Global Trade Identification Number	00689228623156, 04524667623151
Item Package Dimensions L x W x H	5 x 4.96 x 2.28 inches
Package Weight	0.2 Kilograms
Item Dimensions LxWxH	5.75 x 4.5 x 3.75 inches
Brand Name	SHIMANO
Warranty Description	2 Year Manufacturer
Model Name	C8C055
Suggested Users	All Ages
Number of Items	1
Part Number	IRDR8000SS
Model Year	2017
Included Components	Bike Parts
Size	Short
Sport Type	Cycling

SHIMANOUltegra R8000 Rear Derailleur Medium Box

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