Will this allow me to use a 2004-2008 10 speed Dura Ace derailleur with a 34 or 36 cassette and a 53-36 crankset? Or just later models?

Short answer is no. Those years 2 types of Dura Ace were released,7800 & 7900. If you have The 7900-SS model then yes(google image the differences) This road link DM is meant to replace the part of the derailleur that attaches to the hanger of Dura Ace 9100. Check out the Wolf Tooth Road Link without the DM in the title. That should get you there. And make sure to install a longer chain. Hope this helps. Btw This will not change your derailleur’s Total tooth capacity, But sometimes rules are meant to be broken. Go for it.

Will this work with shimano 105 r7000 gs cage rear derailleurs?

Yes, it will. Fits Shimano R9100-generation Dura-Ace, R8000-generation Ultegra, and R7000 105 rear derailleurs

looking to go to a shimano 11-42 CS-M8000with a grx 810 rear derailleur, would this be the right product?

Yes, this is what I'm using mine for.

Will this work with an xtr/xt derailleur and 3x up front?

No this is for the road rd’s dura ace 9100, ultegra 8000, and 105 7000. You want to get the mtb version. Check the wolftooth website it will tell you which version you want. I would think it works on a triple, I use it with more chain than they say works for sure, and it still works. I think they say on a 2x you want a 36 max cassette, but I am using a 42.

Roadlink DM

Product ID: 61985879

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Details

Brand
Wolf Tooth
Color
Black
Material
Aluminum
Item Weight
0.05 Pounds
Mounting Type
Brazing Mount

📈Optimized for 11-speed wide-range cassettes

⚖️Ultra-light 8g weight

⚙️CNC machined precision

Description

🚴‍♂️ Shift smarter, climb harder, ride farther with Wolf Tooth Roadlink DM!

LIGHTWEIGHT DESIGN - Adds only 8 grams, keeping your ride fast and agile
ENHANCED CHAIN WRAP - Maximizes chain engagement for smoother, more reliable shifting
PRECISION CNC MACHINING - Crafted in Minneapolis for unmatched durability and fit
WIDE RANGE COMPATIBILITY - Seamlessly supports 11-36t, 11-40t, and 11-42t Shimano cassettes
EFFORTLESS CLIMBING BOOST - Expand your gear range and conquer hills with less energy

The Wolf Tooth Components Roadlink DM is a precision CNC-machined derailleur adapter designed to reposition Shimano direct mount road derailleurs for optimal performance with wide-range 11-speed cassettes (11-36t to 11-42t). Weighing just 8 grams, it increases chain wrap and reduces free chain movement, delivering crisp, reliable shifting and enhanced climbing efficiency for serious cyclists.

Specifications

Manufacturer	Wolf Tooth Components
UPC	812719027106
Global Trade Identification Number	00812719027106
Item Package Dimensions L x W x H	5.6 x 2 x 0.5 inches
Package Weight	0.02 Kilograms
Item Dimensions LxWxH	6 x 3 x 0.5 inches
Brand Name	Wolf Tooth
Warranty Description	Limited Warranty
Model Name	ROADLINK-DM
Suggested Users	mens
Number of Items	1
Part Number	ROADLINK-DM
Included Components	Miscellaneous Rear Derailleur Part
Size	小
Sport Type	Cycling
Skill Level	Intermediate

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