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Grx 400 derailleur can take a 36 coq cassette

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Grx 400 derailleur can take a 36 coq cassette

Old 12-30-21, 08:46 AM
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friskejohn@live
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Grx 400 derailleur can take a 36 coq cassette

Says Shimano.
But can it actually take a 40 coq-cassette with no problem? . Anybody who have tried?. I know i can do a lot of other things, such as going one by - or a 600 or 800 derailleur.
I only do gravel once and a while (i am a mtb-guy), so the only thing i will do, is a another cassette, with more tooths.
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Old 12-30-21, 03:30 PM
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Originally Posted by friskejohn@live View Post
But can it actually take a 40 coq-cassette with no problem? . Anybody who have tried?
I know people who use it with 11-40 or 11-42 cassettes. Achieving crisp shifting across the whole range can be more finicky than if you stay in-spec, and you end up pushing the derailleur's limits for chain wrap: sizing the chain big-big-plus-an-inch is a good idea here, but note that the drivetrain will get pretty slack if you're ever riding in the small-small region of the gearing range (so try to avoid doing that). Depending on the bike's hanger geometry, you may need to use a hanger extender like a RoadLink DM to get good results. But these derailleurs have a pretty wide range of adjustment from the b-screw, so you could always try fiddling with that before buying the extender.

But yeah, it can be made to work pretty well.
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Old 12-31-21, 08:25 AM
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friskejohn@live
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Thank you both for answering. I think i will try with a 40 coq-cassette. 👍😉
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Old 01-01-22, 12:30 PM
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I've run an 11-42t cassette on my 2x GRX400 groupset bike. Though I just don't like the weight of bigger cassettes and swapped back to an 11-36t 10 speed cassette and dropped rotational mass with carbon wheels.

I've been looking at the Sunrace MX3 11-40t 10 speed cassette (it's the lightest 11-40t 10 speed cassette I've seen), but they're a bit hard to find right now. There's also an ultra lightweight 10 speed 11-36t available on AliExpress as another option. Honestly the only time I needed the 42t is for very steep single track trails/fire roads (37t being the next lowest gear on the 11-42t cassette). For 2022 I'm going to see if I can tackle those same trails just with just the 30:36t low gear.
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Old 01-01-22, 01:00 PM
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Check out the link below. You can go up to 42 with GRX but it really should include a RoadLink/GoatLink. He is testing the 800 series derailleurs but I think the mech is the same on GRX400.
https://bikepacking.com/gear/wide-range-grx-2x11/
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Old 01-01-22, 01:37 PM
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Some very good advices. 👍 Looking for the goatlink for 2*10 (going to use it with a 11-40 cassette). I can only find a goatlink for 1*10. Is it the same goatlink?.
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Old 01-01-22, 02:47 PM
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According to the Wolf Tooth site - RoadLink DM is optimized for GRX. GoatLink is for 1x systems, but the Bikepacking video ran the tests with the GoatLink. I suspect either will work. I have the RoadLink DM connected to my GRX 815 and will run a 10-42 cassette, but the drivetrain isn't complete yet so I can't tell how well it will work.
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Old 01-01-22, 02:52 PM
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Okay. Thank you for the reply... 👍
Yes its properly a roadlink. I have read that the roadlink only can handle a 14 tooths difference between the two front rings. On my 2*10 setup its 16 in difference.

Last edited by friskejohn@live; 01-01-22 at 04:05 PM.
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Old 01-01-22, 04:20 PM
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On a side note, SunRace does provide an extender hanger with some of their cassettes, so you might be able to save some money if you go that route. Also I've notice different frames can affect how low the GRX400 rd will go. I recently did a frame swap and on my new frame the pully and cogs rest a bit lower. I ended up putting a shorter chain and removed the GoatLink I was using. if I do go 11-40t in the future, I'll keep the rear derailleur as-is and adjust the b-tension screw.
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Old 01-01-22, 04:30 PM
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Yes i will certainly look at the Sunrace-link.😉
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Old 01-04-22, 11:15 AM
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Originally Posted by friskejohn@live View Post
Okay. Thank you for the reply... 👍
Yes its properly a roadlink. I have read that the roadlink only can handle a 14 tooths difference between the two front rings. On my 2*10 setup its 16 in difference.
That doesn't make any sense. The RoadLink goes on the derailleur and simply changes it's position relative to the cassette. There is no way it could tell the difference between the chainrings. The limiting factor is the derailleur - not the RoadLink.
Check out this great video showing what works.
https://bikepacking.com/gear/wide-range-grx-2x11/
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