Wolf ToothComponents Roadlink DM

Used the Road link DM with Ultegra RD-RX800 rear derailleur (the one with a clutch) to shift on a 11-40 cassette and it improved the overall performance significantly. To be clear, the medium cage RX800 derailleur can already clear 40T with careful b-screw adjustment, but the shift performance for smaller cogs is suboptimal due to reduced chain wrap. I also found it became quite sensitive to slight cable tension difference so to dial in perfectly is a bit tricky.This b-link from WTC improves chain wrap by offseting the position of the derailleur so that the b-screw not longer needs to be almost maxed out to clear the largest cog (yes it's very important to readjust the b-screw after installation) and the increased chain wrap helps with the shifting performance. The Road link DM is very well made. Still a bit pricey for what it is but it's a simple and easy solution.

Worked great for 11 speed dura ace di2. If you want to keep the dura ace rear mech but want big cassette, this is the way. You might need to replace chain with 1-2 extra links depending on your current chain. Or not.

I got an Ultegra R8000 to try to run a 40t cassette without resorting to "bandaids" like a normal Roadlink or having to modify cable pull to use a mountain derailleur. It did clear the 40t without even maxing out the factory B-screw, and it shifted surprisingly well for having 2"+ of free chain in smaller gears.Jumped on this to see if I could really run a 10-42t XD cassette and free up some range. First thing I notice when I tighten up the bolts- without touching the B-screw from where I had it, it's now got about as much free chain in the 40t as I had in the 11t before! Back that way off, and it's got probably 2 more teeth wrapped in the big cog, and free chain in smaller cogs is maybe 25% more than a normal road cassette, rather than 3-4x as much.Like everything else I've gotten from Wolf Tooth, it looks and feels quality. It's not super-cheap, but then it's relatively low-volume, US-made, and I don't think the price is high either, given that. Well worth the price of, say, a half-decent chain, IMO.

Allowed smooth shifting to the largest 40 cassette on my gravel bike with shimano grx400 (original was 11-36 cassette)I could go 11-42 if I wanted to as well now.I didn’t need to fiddle with any of the other shifter settings.

Since most of the bikes for sale these days come with compact cranks or "one bys", I needed a solution to get lower gearing to compensate losing the triple geared cranks that I've grown accustomed to over the years. This enabled me to use an 11-40t cassette on my Trek Domane. Very Sweet!

Will update if anything is worthy of demoting. Used this with and Ultegra RX r800 and an XT 11-42 cassette. The RX is rated to hit 34-36. I did not need to extend my b-screw. Just a slight limit adjustment and b adjustment. You remove part of the derailleur and replace it with this.UPDATE: Zero issues. This thing has been put through as much of "the wringer" as possible for an RD upgrade. Great tool for a cheap and effective upgrade.

after mounting it moves derailleur so far to the right that derailleur wont reach two cogs.i tried 2 different derailleur and both had same issue.had to turn one set screw all the way in to line up first cog and the other all the way out and still arm wont go far enough.looks nice and well made but didn't work for me

The link was super simple to install. Torque settings would have been nice, but standard 8-10nm works. I had tried the RoadLink before with an Ultegra mech, which didn’t quite work on that TCR. Tried this Direct Mount version on my gravel bike and it lets me run an 11-40 with the b-screw all the way in. Previously I could use the same cassette, but the b-screw was not making full contact with the mech body. This RoadLink DM solves that elegantly and simply. I could probably go up to a 11-44 even.