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.

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Components Roadlink DM

Product ID: 307543003

Details

Brand
Wolf Tooth
Colour
Black
Material
Aluminium
Item weight
0.05 Pounds
Case material type
Aluminium

🔧Durable Aluminum

⚙️Wide-Range Gearing

🇺🇸Proudly Made in USA

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Description

🚴‍♂️ Elevate Your Ride with Wolf Tooth's Roadlink DM!

BUILT TO LAST - CNC machined 6061-T6 aluminum ensures durability on every ride.
LIGHTWEIGHT CHAMPION - Weighs only 20g, adding minimal weight for maximum performance.
RIDE WITH CONFIDENCE - Perfect for road, gravel, and touring bikes—conquer any terrain!
VERSATILE COMPATIBILITY - Fits a range of Shimano road derailleurs for ultimate flexibility.
UNLOCK YOUR GEAR POTENTIAL - Transform your ride with compatibility for mountain bike cassettes!

The Wolf Tooth Components Roadlink DM is a derailleur hanger extender designed to enhance your bike's gearing capabilities. It allows compatibility with a wider range of mountain bike cassettes while supporting Shimano road derailleurs. Crafted from durable CNC machined aluminum, it weighs just 20g and is proudly made in the USA, ensuring long-lasting performance for all cycling enthusiasts.

Specifications

Mounting type	Brazing Mount
Number of teeth	36
Manufacturer	Wolf Tooth
UPC	812719027106
Color	Black
Size	One Size
Height	1 inches
Item display length	1 inches
Weight	23 g
Item display width	1 inches
Material type	Aluminium
Number of items	1
Sport	Cycling
Batteries included?	No
Department	Men's
Item model number	ROADLINK-DM
Product Dimensions	15.24 x 7.62 x 1.27 cm; 22.68 g
ASIN	B07BK67N3F

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