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Shimano grx groupset

Old 06-23-19, 07:17 PM
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ahultin
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Shimano grx groupset

I am looking at this groupset for a new co-motion steelhead that one of my stokers just ordered . The main advantage is the native support for up to a 42 tooth cassette. What I cant seem to locate is what post mount brake would be the best to use (flat mount is not yet an option for the steelhead). Does anyone know, Would the new xt 2 or 4 piston post mount brakes work ?
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Old 06-24-19, 08:52 AM
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The GRX rear derailleurs aren't much different from other current offerings from Shimano and SRAM. They have a 1X version (with limited chainwrap) for 42T cogs or a 2X version for 34T cogs. The Shimano RD-M8000 (plus WolfTooth Tanpan) and SRAM GX (plus WolfTooth Roadlink) remain much better derailleurs for wide range drivetrains.

To the original question -- yes, you can mix Shimano road hydraulic levers with Shimano MTB hydraulic brakes and vice versa.
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Old 06-24-19, 12:47 PM
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Originally Posted by OneIsAllYouNeed View Post
The GRX rear derailleurs aren't much different from other current offerings from Shimano and SRAM. They have a 1X version (with limited chainwrap) for 42T cogs or a 2X version for 34T cogs. The Shimano RD-M8000 (plus WolfTooth Tanpan) and SRAM GX (plus WolfTooth Roadlink) remain much better derailleurs for wide range drivetrains.

To the original question -- yes, you can mix Shimano road hydraulic levers with Shimano MTB hydraulic brakes and vice versa.
Thank you! I completely missed the reduced chain wrap in the specs and thought it was just a long cage and short cage version.
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Old 06-30-19, 02:54 PM
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I'm also interested in the new GRX group and had noticed the two derailleurs offered. Does anyone know if the "1x" version of the GRX derailleur really is limited to use on single chainrings, like SRAM's 1x derailleurs are? I'm running a 40 or 42 tooth cassette PLUS a double chainring to get the gear range that I want without any excessive gaps between ratios. Shimano MTB or any SRAM derailleurs are not options because I'm using Di2 and the FD needs to have a braze-on mount.

So, should I go with the GRX derailleur that officially gets low enough to clear the 42-tooth cog, or go with the version that is officially listed for double chainrings and hope that it can drop down low enough? Chain wrap capacity isn't so important since the Di2 sensibly blocks access to the small-small gear combos anyway. Thanks.
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Old 06-30-19, 02:59 PM
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I think that you are going to see longer cages for these derailleurs just like we used to with the 10 speed MTB derailleurs.
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Old 07-05-19, 09:55 PM
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If Shimano is true to form, the GRX group stuff probably won't be available on the retail side until late fall,
maybe even early next spring. I got all hot and bothered about the Ultegra 8000, announced in April-May but
could not find any for sale on the web til Jan-feb of the following year. Ditto with the following year 105
7000 group. Annoyingly, a few months ago I finished re-uping a 2001 frame to a 7000 group but had to
use an FSA chainset to get the desired 48-32 at a reasonable price. Now GRX comes out with such......... Maybe in 3-4 yrs, when
the FSA gets long in the tooth and worn..... At least Shimano is finally making sub/sub compact CW sets.
By that time the 46/30 might be more attractive.
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Old 07-08-19, 12:18 AM
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Regarding availability, at least some of the GRX cranks are already available - I received two 46-30 cranks in June that I ordered from the local importer as soon as they were announced back in April. Availability for the mechanical derailleurs is listed as July/August and the Di2 versions for September. I have a bunch of parts back-ordered to go on various bikes, so we'll see when they all arrive. Many bike brands have gravel bikes with full GRX groups listed in their 2020 lineups that should be available this fall/autumn.

BTW, the standard Ultegra Di2 front derailleur works perfectly on the new 46-30 cranks, despite the chainline being slightly wider than the derailleur was designed for and the teeth of the big ring being slightly lower. Making the necessary adjustments was no problem on two separate bikes that both have braze-on FD mounts.
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Old 07-18-19, 11:11 AM
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sch
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That is interesting but I note you are in Switzerland. Just quoting my experience with the 8000 and then 7000 series Shimano groupsets
availability in the US and applying to the GRX. OTOH Shimano has pretty much cutoff European sourced sales to the US, at least the
3-4 UK outlets that had 105 to Di2 groupos for somewhat less than US pricing until ~6-8 months ago. The year the Ultegra 8000 Di2 was
announced ( in April) a friend getting a custom bike built had to wait to December to finally get his Di2 hydraulic shifters in that groupset.
Manufacturers get stuff a lot sooner than the retail channels. I would really have liked to have the GRX on my rebuild but it is too late.

A bit of google shows that Jensen in US has 46-30 GRX cranks in stock.... (...appropriate curse words...)!

Last edited by sch; 07-18-19 at 11:16 AM.
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