it says long cage & Capacity: long 39t Cassette Range: long 11-28t through 11-34t too many numbers here but not computing correctly is it 39t or 34t?

39t is the capacity of the rear derailleur. To determine if your setup will work with this derailleur you need to sum the differentials of the cogs, and the crankset. This is done by subtracting the number of teeth of the smallest cog from the largest cog. For example if you're running an 11-34 cassette you'd do the following; 34 - 11 = 23. Then you'd do the same for the crankset, so if you're running a compact it would be; 50 - 34 = 16. Next you sum the two results 23 + 16 = 39, and 39 is the maximum capacity of the RD-R7000 GS. You can use a smaller cassette than 11-34 with this derailleur, but 11-34 is the max. according to Shimano.

Would this work with a 10 speed shifter and cassette?

Will work, running Tiagra shifters and 10 speed cassette and saving this way about 100 grams compare to 11 speed cassette

Will this work with the Shimano Ultegra shifter?

You always match speed rating to speed rating; an 11-speed shifter to an 11-speed rear deraileur and sprocket; I am unaware, if there are adaptions, or adapters, for differing speeds; you need to then check the Ultegra speed of the shifter; even if 11-speed, an older Ultegra, might take more adjustment to work with the 105 R7000 (new design); since I havenever mixed groupsets, I cannot advise they strictly matched speeds resolves all issues; though, the R7000 is mfg expressed as “trickle down design) it should work with Ultegra (if speeds are matched); sorrry for long message, hope this helps, good riding; cheers

Will this work with a 10-speed?

What if I have a 105 11 speed shifter, and 11 speed rear derailleur. But I have a 10 speed cassette?

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⚙️ Shift into the future of cycling performance!

FEATHERLIGHT DURABILITY - Crafted from premium aluminum, weighing just 225 grams for effortless speed.
COMPACT SHORT CAGE DESIGN - Sleek profile that enhances bike aesthetics and reduces drag.
SEAMLESS 11 SPEED SHIFTING - Experience crisp, reliable gear changes that keep you ahead of the pack.
PRO GRADE SHIMANO ENGINEERING - Trusted performance from a brand synonymous with cycling excellence.
UNIVERSAL FIT FOR UNISEX RIDERS - Versatile compatibility ensures every ride feels custom-tuned.

The Shimano RD-R7000 105 Rear Derailleur is a high-precision, lightweight aluminum component designed for 11-speed drivetrains. Weighing only 225 grams, it offers smooth, reliable shifting with a compact short cage design, making it an essential upgrade for serious cyclists seeking professional-grade performance and durability.

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Manufacturer	Shimano
UPC	689228871137
Global Trade Identification Number	00689228871137
Color	Black
Size	11 Speed Short Cage
Weight	225 Grams
Material Type	Aluminum
Number of Items	1
Sport	Cycling
Included Components	SHIMANO 105 R7000 RD-R7000
Batteries Included?	No
Department	Unisex-Adult
Item model number	IRDR7000SSL
Product Dimensions	12.78 x 9.73 x 17.35 cm; 226.8 g
ASIN	B07GGLVDG3

ShimanoRD-R7000 105 Rear DERAILLEUR

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