I have a GRX RD-RX810 rear derailleur and I need a compatible (thumb) shift lever for flat bars.
Any suggestions which shifters are compatible for my setup?
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I'm amazed that this isn't a duplicate, as GRX is basically a wide-ratio road drivetrain, and Shimano road and MTB 11 speed kit isn't directly compatible. While I think that's been discussed here before, I can find it.– Chris HCommented Nov 22, 2023 at 9:18
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Yo puedo leer un poco español, pero esta pregunta no es muy facile para un novicio. ¿Timón = manillar?– Chris HCommented Nov 22, 2023 at 9:29
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@ChrisH What about these? Looks like 105/11-speed-compatible thumb shifters, should have GRX-compatible pull-ration, or am I wrong?: link– DoNuTCommented Nov 22, 2023 at 10:41
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@DoNuT good find. I think they ought to work. I haven't worked with GRX (my gravel bike is 105 2×11) and I stopped thinking much about drivetrain compatibility between road and MTB series when I bought that bike - it's through-axle and my other bikes are QR.– Chris HCommented Nov 22, 2023 at 10:45
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1@DoNuT That works: cube.eu/ch-en/cube-nulane-race-fe-rubyred-n-black/…– RеnаudCommented Nov 22, 2023 at 10:51
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2 Answers
The other answer has already a specific product, but i wanted to answer in a more generic way for people with a similiar issue and maybe not the exact same product :)
You can find official compabilitly list of all shimano components at
https://productinfo.shimano.com/#/
You need to know which specific version you have. (not just RX810, but also 1x11/2x11 etc.)
In the compability chart, look for Shifters with the SL prefix.
SL = flat handlebar shifters
ST = drop handlebar shifters
For your case, you most likely you can use shifters from the 105 series and there was a limited edtion GRX specific flat handlebar shifters.
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I didn't want to do product recommendation (since SL-U5000-R seems to be the other option if you ignore TT bike bar-end shifters) but yours is probably the better overall answer. It would be great if deep-linking into the compatibility chart would work.– DoNuTCommented Nov 22, 2023 at 12:18
Shimano offers thumb shifters that are compatible with 11-speed road groupsets
https://bike.shimano.com/en-US/product/component/105-5800/SL-RS700.html
I haven't checked if there is a newer iteration of the product since 105 R5800 is out for a few years but they've been used on flatbar GRX bikes, as an example: https://www.cube.eu/ch-en/cube-nulane-race-fe-rubyred-n-black/cb9372bb50c65be2c045a3ed7996cbb7
Edit As out also mentioned in the other answer, scrolling to the 11-speed section of the road rear drivetrain compatibility chart lists these (and SL-U5000-R) as the current options. SL-prefixed components is what you have to generally look for. ;)