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 Like a Pro, Ride Like You Mean It

BUILT TO LAST - Stainless steel B-Axle delivers unmatched stiffness and durability for every ride.
NOISE DROP DEFENSE - Chain stabilizer minimizes chain slap, drop, and distracting noise.
CLEAN SETUP EASY TUNING - Direct cable routing with barrel adjuster means faster, hassle-free adjustments.
SHADOW DESIGN ZERO DRAMA - Compact profile reduces snagging and keeps your ride sleek.
PRECISION 11 SPEED SHIFTING - Effortlessly glide through gears with Shimano’s renowned smoothness.

The Shimano105 Shadow RD-R7000 is a medium-sized, 11-speed rear derailleur engineered for traditional hanger and direct mount systems. Featuring a compact shadow design, stainless steel B-Axle for enhanced stiffness, and a chain stabilizer to reduce noise and chain drops, it ensures precise, reliable shifting for year-round cycling performance.

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Product dimensions	20.3L x 12.7W x 10.2H centimeters
Manufacturer	Shimano Inc.
UPC	689228871113
Global Trade Identification Number	00689228871113, 04524667871118
Color	Black
Size	Standard
Hand Orientation	Medium
Style	Rd-r7000
Team	Shimano
handle-type	Lever
Weight	0.85 Pounds
Material Type	Aluminum
Number of Items	1
Season	Year-round
Sport	Cycling
Included Components	1 x Shimano RD-R7000-GS 11 Speed Rear Derailleur, Black
Batteries Included?	No
Department	unisex
Item model number	C8C069
ASIN	B07DLLZ1NC

SHIMANO105 Rear Derailleur Shadow RD-R7000 11-Speed Version Medium

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