Shimano GRX RD-RX812 with an 11-46 Cassette. Will this work? Low Gearing on a Gravel Bike.

[@gearedforadventure]

BTW: The chain should be longer, I just didn't have any spare links to add. Everything works so far, but to prevent any premature wear I will definitely extend the chain by at least 2 links in the near future. UPDATE: Installed 118 links chain and now it is perfect.

[@simongschwend447]

I just mounted a 11-46 cassette to my Cube Nuroad C62 pro (from 2020) and it works just fine. Minor adjustments at the derailleur were necessary, but now im happy. Thanks for the Video!

[@kossportapro23]

Do you use 2x cranks ?

[@simongschwend447]

No, I'm using 1x

[@gordonh0903]

it seems you can still add some chain links to avoid the derailleur so tight in 46T.

[@gfelkner]

I appreciate this. I'm currently running a GRX 810 with an 11x40, but occasionally need a lower gear. In the past I have switched to a smaller chainring (from 38 to 34), at the expense of my top gear. I just ordered the GRX 812, and I already have an 11x46 on the shelf from an earlier experiment. This should be a better solution, and it will probably (hopefully?) improve my shifting a bit when I run the 11x40, which is most of the time. The GRX-810 is pretty impressive in it's own ways, I even managed to run it in 2x with 44x30 chainrings and 11x40 cassette. It had just enough chain wrap and did a reasonably good job in the back, but the front derailleur adjustment was a struggle. Something always seemed to find a way to rub. I enjoyed the range it provided, but I eventually gave up on it and reverted back to 1x.

[@sznib]

So, 4 tooth above specification. The same situation with RD-M675; rated to 36T max, works fine with 40T cassette without any modifications, and "H" screw isn't screwed to max.

[@Piplodocus]

I found my range not quite as wide as I'd like stock (slightly ran out of top end with the 38t chainring that came with it). But I love GRX and have the dropper lever and in-line brakes. So I bought a SRAM XD driver freehub for my wheels and put a SRAM 10-42 on my GRX instead. Works great. Lighter cassette than the 11-42 Shimano that came on it. SRAM 10-42 with a 38t is pretty much the same range as an 11-46 with a 42t chainring. (25 to 106 gear inches)

[@UweNitsche]

Running the RD-RX812 with a CS-M5100 11-51 just fine with a GRX 40T front ring (yes your chain will need to be longer). B-Screw isn't even all the way in (Its an Orro Terra C bike so your hangar may need extending)

[@alejandronavgar8798]

Thanks, I'm going to put this derailleur with 11v and 105 levers on my gravel bike 🖐🖐🚲🚲💪💪

[@Johann-4354]

Wow. That's an excellent rang.

[@hansvandemortel4994]

Dude That's very nice. So I could use Tiagra 4700 2x10 speed brifters with the GRX 812 and the Deore 10 speed 11-46 with a Grx 10 sp 30-46 crank ?????????? Yehoo that would be nice bikebacking 125 kg up the Alpes. Am i right >?

[@EricPeelMusic]

To anyone reading this. 36x46 is NOT low enough for adventure, bikepacking, touring etc. And the jump from 37 to 46 is and will always be, no matter how much you want it not to be, stupid and uncomfortable. It is one of the worst cassettes Shimano has ever came out with and they are continuing to overcompensate for their poor choice by coming out with a full lineup of mtb cassettes with big cogs that have steps TOO CLOSE. The best mtb cassette Shimano has ever made is their 11-40t 11s. Pair this with a 42/26 crankset, and you’ll be much happier with evenly spaced steps, a low enough low gear and a high enough high gear.

[@gearedforadventure]

Really depends where you ride. Last year I crossed Sedlo Pass in Durmitor, Montenegro with this setup (with panniers) and it was allright. And as long as grades are up to 8-9% it is ok, at abut 10% it becomes hard and from 11% and above its gets pretty bad. But I'm going to get 11-51. Gear jump doesn''t bother me at all. But I'd be happy to swap this for 42/26 any day! Do you know any widely available crank with this chainring combination? Widely available is a key as I don't live in US so any niche product from local manufacturers is out of question :(

[@EricPeelMusic]

White Industries ships worldwide with DHL. You can order any big ring 38-52 and any small ring 24-38 using their VBC crank. I really want to try 46/26 with the 40 cassette. Puts me in the 15-17-19-21 cogs for cruising efficiency and small steps. But the low gear is low enough and the high gear is a good overdrive for standing and pedaling on flats. That’s the other problem with a 36t ring paired with Shimano 11s mtb cassettes, which I ran for years. You’re forced to cruise in the 11-13-15 area. And you have no standing up overdrive gear. That sucks.

[@EricPeelMusic]

Forgot to mention, 26x40 is good to 16% for me with a loaded bike, which I encounter often on fire roads in the northwest US.

[@twosix_00]

​@@gearedforadventureOne question, I hope you can help me, comparing this derailleur with a Shimano XT M8000, which would be the highest range? I currently have a 1x11 groupset on a mountain bike with a shimano deore 11-speed cassette (11-42) and a shimano xt front derailleur, but I like the GRX, do you think the gearing is good or do I stay as I am? Postscript, I have a 34 chainring and I plan to put a 36, is it true that the greater the number of teeth there is greater wear?

[@jeanbravo5885]

Hi, a GRX 812 can work with a 11 speed casset 9-46 XD?

[@Leo-gt1bx]

I am seriously questioning B links on standard RDs. Is it not just a cause for more flex and wear?

[@koenvanniekerk4231]

I have the same question. Would be the ultimate high range low gear solution…

[@mofun01]

Great music! Nice bike!

[@OMPONG777]

Love the set up, bit can i use rx812 11 42t on 2x set up 10 speed? Thank

[@maximivanov3015]

You can, but you need to change cage to SGS M8000 cage

[@luketoms6110]

Did you have to adjust the th3 b screw

[@ТупоВинегрет]

What chain you are using?

[@mikaelle322]

Compared to 11-42 cassette, is the 11-46 a bit noisier? Tnx

[@gearedforadventure]

I can't say, didn't have 11-42.

[@dalesaco1998]

Hello! I wanted to ask, is it possible to use GRX RX812 rear derailleur with a 2x11 setup? By the way my chainring is 30T/46T. And for my cassette, it is 11T - 42T.

[@gearedforadventure]

Sorry for answering so late, but I don't think this derailleur can handle it, it doesn't have enough capacity. Although there are some modifications where people were using RX812 with modified cage from I think XT or SLX derailleur and it worked on 2x. You can search on youtube.

[@paulh9301]

@@gearedforadventure It's going to be challenging to get a shimano MTB derailleur to work right. Pull ratios are different from road group sets.

[@NoBrakes23]

@@paulh9301 I think he is just talking about the cage from an XT on the GRX derailleur. Similar to how Garbaruk offers an extender cage for the -812, so that it can handle up to 50t.

[@gunarstreikals2099]

Currently my bike is running - 46/30 and 11-42 cassette and grx812 doesn’t really like it. It shifts, but you need to be very precise with chain length. Like on my road bike never was I in small ring front and small one at the back. So if avoiding small small combo, it’s doable as long as you know what you are signing up to

[@clydeparamio615]

what is your chainring?

[@alejandrogonzalez93-d]

Nice video. Would it work with the Goatlink with the same chain length? It may help loosening a bit the derraileur tension.

[@miguelropero]

Hello. I have a gravel Canyon with Shimano grx derailleur and brakes. Originally with: - 2 chainrings 30-46 - Shimano GRX RX400 GS long rear derailleur - I changed the 10s 11-34 cassette to a 11-42 shimano 10s to climb better. I put a sunrace extender so the derailleur wouldn't hit the cassette and a slightly longer chain. It doesn't work very well ... That's why I want to try this change that you have put, the GRX Shadow Plus RD-RX812. Do you think this derailleur (of 11s) would go well with my 10s cassette and my 10s grx shifter and my 2 chairings? Thanks

[@raphaelgaleano3580]

La estructura es exactamente igual a un rd m8000 o rd m5120 ✌🏼

[@alre1368]

Great video! I wonder if it would take an 11-52! Haha

[@gearedforadventure]

Without a goatlink or some other extender I don't think it would.

[@aguagou]

Hello Sir, do you know if this rear derailleur can work with mtb shifter like deore, slx, or xt?. 🧐 Thanks.

[@gearedforadventure]

It does not, but mtb deraillers are usually cheaper and have greater range than this GRX so I don't really see the point in doing this

[@corbinkoepke4598]

Thank you for doing this test. Going from a 11-40t to 11-46t, did you have to re-tune the 812 derailleur? The reason I ask is that I use 3 different wheel sets (Road, Commuting, and Gravel) and only want to put the 11-46t on the Gravel wheels and don't want to have to mess with the derailleur and chain every time I switch wheels. Also, to confirm, you added 4 links to the chain from 114 to 118? I'd imagine this longer chain would also work fine with a 11-40t.

[@gearedforadventure]

yeah, I have 118 links. And it was necessary to finetune the derailer, but mostly by adjusting the b-screw. Proper chain length will differ between bikes, due to different frame dimensions. This one has 455 mm long chainstays, while most gravel bikes will have less than 435.

[@corbinkoepke4598]

@@gearedforadventure Thanks for the info! It wouldn’t be too bad adjusting the b-screw but it would definitely be a pain to do index adjustments every time. Any index adjustments required that you remember?

[@gearedforadventure]

@@corbinkoepke4598 not sure, but keep in mind I only changed the cassette on the same hub, but if you swap the wheels the new hub might have some micro differences in how the cassete is positioned on the freehub body, and this might affect the derailer performance.

[@corbinkoepke4598]

@@gearedforadventure Thanks again for the response, helpful insight as I decide how to change my setup. Cheers!

[@therealSIRBOOM]

Was a spacer required for the cassette?

[@antogutierrez8890]

thank you for your vide! it is very interesting. Would does it work with 2x crankset ?? For example with 46/30T

[@gearedforadventure]

I don't think it would be able to take so much chain slack, this derailleur isn't really meant for 2x. But there is a youtube video where someone swaped the GRX RX812 derailleur cage for SLX derailleur cage and is seems to work like that.

[@riyahsuharto2159]

@@gearedforadventure does the derailleur that you used is medium cage?

[@gearedforadventure]

@@riyahsuharto2159 It is GRX RX812, I think technically it is a medium cage, though this model is available only in one cage length.

[@Leo-gt1bx]

What is your average top speed?

[@edudutra]

What about a 9-46 cassete. Do you think it would work?

[@gearedforadventure]

Not sure, haven;t tested this. Might be a bit rough on the smallest cog, but might work.

[@andrewfalle8631]

Great video! That's interesting that Tiagra 4700 happens to have the correct pull ratio. Would Shimano 105 R7000 11speed brifters also then work with the GRX RX812 derailleur?

[@sabamacx]

Yes they do.

[@renaissancefam5465]

yes.

[@Saif.salim78]

11-51t cassette with 53-39t crank on road bike?

[@robertsandiford6223]

Hey, has this kept working well for you? Cheers

[@gearedforadventure]

Yup, still using this combo, no issues whatsoever.

[@MAGAIVER]

I've been using an XT 11-46 with a full GRX 800 group for about 2 years now, no issues.

[@stemac1969]

I can safely say the 812 works with an 11-46

[@corbinkoepke4598]

Thanks for providing the confirmation. Going from a 11-40t, did you have extend the chain and/or re-tune the 812? The reason I ask is that I use 3 different wheel sets (Road, Commuting, and Gravel) and only want to put the 11-46t on the Gravel wheels.

[@joenas8709]

Chain a bit short

[@alcazarfreddy]

Garbaruk…. even 10-50 works man

[@AG-el6vt]

@@ODB_ £70 to get a longer cage. Lmfao.

[@salmanshami]

Garbaruk works even with 11-51

[@alcazarfreddy]

@@salmanshami Not with Shimano (at least mot according to Garbaruk support). I have the 10-50 and gotta say…. keep your money if you have a 10-42!!!! Change the small plate in front, better bang for your buck