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Cyclocross and Gravelbiking (Recreational) This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like : "Unbround Gravel". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

Shimano GRX gravel group

Old 05-07-19, 09:31 AM
  #1  
tyrion
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Shimano GRX gravel group

https://www.cxmagazine.com/shimano-u...00-rx600-rx400


Particularly interesting, "interrupter" hydro brake levers:

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Old 05-07-19, 09:38 AM
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Shimano Dedicated Gravel Groupset

https://gravel.shimano.com/
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Old 05-07-19, 09:45 AM
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Shimano now has 1x.

There you go.


-Tim-
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Old 05-07-19, 09:45 AM
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Wow they are trying to put wolftooth out of business
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Old 05-07-19, 09:47 AM
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YEEEEEEEES!!!

Shimano FINALLY sells a 46/30 crankset!!

https://gravel.shimano.com/en/components/di2-speed/

(and for those who care, 1x as well)



BUT...with 12-speed about to be a thing any time now...this is again the World's Worst time to be releasing 11-speed parts. When gravel riding season is already under way and people have already bought kit for the year.
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Old 05-07-19, 09:50 AM
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Originally Posted by TimothyH View Post
Shimano now has 1x.

There you go.


-Tim-
And a 46/30
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Old 05-07-19, 10:00 AM
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Now it is Official no more cry babies in regards to Gravel. The very biggest of the big dogs has barked thus it must be true.
Anyone able to tell what they did here? is it just rebadged or a new way of doing things?
I love it.
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Old 05-07-19, 10:17 AM
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Now another product I’m going to need I think I’m going to set up a go fund me page for bicycle component addicts.
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Old 05-07-19, 10:22 AM
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If I am reading their propaganda correctly, the new cranksets have a +2.5mm chainline that requires you to get the matching front derailleur (or maybe both, at least in the case of the Di2 version). They are also going to introduce in-line hydraulic brake levers later in the year.

The higher-end 48/31T crankset seems like an unusual gearing choice.
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Old 05-07-19, 10:23 AM
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Originally Posted by wgscott View Post
If I am reading their propaganda correctly, the new cranksets have a +2.5mm chainline that requires you to get the matching front derailleur (or maybe both, at least in the case of the Di2 version). They are also going to introduce in-line hydraulic brake levers later in the year.

The higher-end 48/31T crankset seems like an unusual gearing choice.
I'm guessing that is a typo. Shimano has had several of those in the last year...some of which made consumers very angry (wheel names and wheel depths being misleading AKA wrong)
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Old 05-07-19, 10:36 AM
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Originally Posted by thehammerdog View Post
Anyone able to tell what they did here? is it just rebadged or a new way of doing things?
I love it.
It's in the video above. Grips are shaped differently, appropriate gravel gearing, interrupter levers, etc.
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Old 05-07-19, 11:19 AM
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I'm seeing 48/31 & 46/30 as the two 2x choices across all marketing material, including all the stuff that's been given out to bike shop employees. So we'll have to wait and see if it's a typo or just a 17 tooth difference choice.
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Old 05-07-19, 11:31 AM
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Cranks look better than road cranks.
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Old 05-07-19, 11:43 AM
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Not a typo evidently: https://gravelcyclist.com/bicycle-te...CsARGqI2Ngizl8

“...RX810 series cranks offer Shimano’s widest-ever delta between small and large chainrings, a 17-tooth gap, that also debuts the company’s first ever 48-31T option. This, when paired with the available 11-34 cassette, offers an exceptionally low climbing gear while maintaining a 48-11 ratio that allows riders to take advantage of strong tailwinds and long descents..."
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Old 05-07-19, 11:46 AM
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Originally Posted by 5teve View Post
Not a typo evidently: https://gravelcyclist.com/bicycle-te...CsARGqI2Ngizl8

“...RX810 series cranks offer Shimano’s widest-ever delta between small and large chainrings, a 17-tooth gap, that also debuts the company’s first ever 48-31T option. This, when paired with the available 11-34 cassette, offers an exceptionally low climbing gear while maintaining a 48-11 ratio that allows riders to take advantage of strong tailwinds and long descents..."
I'll wager it is a typo. A systemic one. Shimano did this with their wheel line-up last year with their wheelset labeling and ad-copy and press-releases.....and stealth-updated all that official material after consumers loudly complained about false advertising.

A 17T FD is just to odd to not be a typo. They're always 16T.
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Old 05-07-19, 11:52 AM
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Originally Posted by wgscott View Post
The higher-end 48/31T crankset seems like an unusual gearing choice.
48-17=31, so it's the max spread on the crankset that their FD can handle if you don't want to sacrifice top end speed. (I know "nobody uses it" except that a 105 cadence on 48x11 is 37mph, which is very attainable) I'd definitely lean toward that set if I had this group.
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Old 05-07-19, 11:56 AM
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I was going to say this is completely unnecessary.

But the in-line hydraulic brake levers and changed pivot point for the brake levers are both pretty damned neat.
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Old 05-07-19, 12:08 PM
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It's been long enough since the CX50 and CX70 groups. Those had cantis!

The brake-dropper lever (bripper?) and the hydraulic interrupter are really clever. The chain line is for 135QR/142TA, which makes sense in context. I'm kind of surprised they didn't take this opportunity to do 1x12 and the new freehub like XTR, but I suppose that needs to percolate through DA first.

Speculations about performance aside, I really like the styling. Shimano does a great job. The crank is like a classier version of the old Race Face cranks.
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Old 05-07-19, 12:20 PM
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One thing I'm not sure yet and cannot figure out anywhere. Will I be able to use the Shimano RD-RX812 rear derailleur with a 2x drivetrain. I'd love to have a 46-30 or 48-31 double crankset with an 11-42 cassete.
From reading shimano's not very intuitive website it seems like the RD-RX812 is for 1x applications with a 42t max cog and the RD-RX810 is for 2x applications with a 34t max cog.
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Old 05-07-19, 12:28 PM
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The dropper activation without having to hack the shifter is awesome.
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Old 05-07-19, 01:10 PM
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Originally Posted by MAGAIVER View Post
From reading shimano's not very intuitive website it seems like the RD-RX812 is for 1x applications with a 42t max cog and the RD-RX810 is for 2x applications with a 34t max cog.
That does appear to be the intent. You can see they're quite a bit different. They're also notable for having a clutch like a MTB derailleur.

The 11-42 is the XT M8000 version which means we'll have 11-42 cassettes around for at least another generation. Whew! Was worried they'd be Eagle'd away. But also means a road hub will need a spacer, since the MTB stuff never went away from the 8-9-10 speed freehub width.

RD-RX810 Search in Compatibility


RD-RX812
RD-RX812
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Last edited by Darth Lefty; 05-07-19 at 01:16 PM.
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Old 05-07-19, 01:35 PM
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Old 05-07-19, 01:43 PM
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Originally Posted by wgscott View Post
If I am reading their propaganda correctly, the new cranksets have a +2.5mm chainline that requires you to get the matching front derailleur (or maybe both, at least in the case of the Di2 version).
SRAM has been doing this with their(mostly unknown) Wide Spacing road cranksets. They offer a "wide spacing" braze on adapter to space the front derailleur over 2.5mm. The problem is that the adapter is priced similarly to buying a new front derailleur.
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Old 05-07-19, 03:26 PM
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Who ever heard of a 31 tooth sprocket? Front or rear?
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Old 05-07-19, 04:31 PM
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https://www.velonews.com/2019/05/new...vetrain_493384

Apparently the shift ramps line up better with a 31T, as for odd teeth chainrings SRAM did the same thing with their new cranksets
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