Shimano GRX 48-31T, 46-30T - RX810, RX600, RX400

[ooo]

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Q-factor 151, Chainline 46.9 - in the middle of mtb CL and road CL, BCD 110/80, mechanical and di2

front
1x11 (BCD 4x110): 42T, 40T
2x11 (BCD 4x110/80): 48-31T, 46-30T
2x10 (BCD 4x110/80): 46-30T

rear
2x11: 11-30, 11-32, 11-34
2x11: 11-40, 11-42
2x10: 11-32, 11-34, 11-36

[prebsy]

Super excited for this stuff. subcompact options for 24mm spindles, shimano 1x RD without range restrictions or weird aftermarket alterations.

[pdlpsher1]

I see a typo in the original post. 1x11 rear should say 11-30, 11-32, 11-34, 11-40, and 11-42. See the attached chart below.

I really like Shimano components because they not fussy and can run beyond the recommended specs. For example I have a super wide gear range on my tandem, 50/34 front and 11-40 cassette, using the Ultegra GS long-cage RD, with perfect shifting in every gear combination. I have little doubt the new GRX can run a 2x11 setup with the 11-40 or 11-42 cassette.




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[ooo]

weight from road.cc:

Di2: RD-RX815/RD-RX817: 288/322g
Mechanical: RD-RX810/RD-RX812: 251/264g

FD-RX815-F: 131g
FD-RX810-F: 94g
FD-RX400: 95g.

ST-RX815-L/R Di2: TBD
ST-RX810-L/R Di2: 565g,
ST-RX810-LA Left side dropper post lever: TBDg,
ST-RX600-L/R: 611g,
ST-RX400-L/R (10-speed): 613g​

BR-RX810: TBCg
BR-RX400: 143g

1x11: FC-RX810-1: 655g FC-RX600-1: 753g.
2x11: FC-RX810-2: 722g, FC-RX600-11: 816g, FC-RX600-10: 819g.

[OnTheRivet]

I've been running SRAM 1X, 40t with 10-42 casstte, this barely gets the job done as far as gear spread for events with steep climbs. 11-42 with 11 speed is is not enough, you lose it on the high or low.

[pdlpsher1]

I've been running SRAM 1X, 40t with 10-42 casstte, this barely gets the job done as far as gear spread for events with steep climbs. 11-42 with 11 speed is is not enough, you lose it on the high or low.

That’s why the 1x thing is a very personalized decision. If you go with a 10-50 cassette then the spread is too big for gravel riding. If you want a tight spread and wide range then a 2x is a better solution.


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[OnTheRivet]

I've been running SRAM 1X, 40t with 10-42 casstte, this barely gets the job done as far as gear spread for events with steep climbs. 11-42 with 11 speed is is not enough, you lose it on the high or low.

That’s why the 1x thing is a very personalized decision. If you go with a 10-50 cassette then the spread is too big for gravel riding. If you want a tight spread and wide range then a 2x is a better solution.


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SRAM missed the boat with axs by not making a 10-46 12 speed cassette, that would be killer. I spoke with some SRAM people and it appears they are walking back from 1X road/gravel, apparently there is more money to be made with 2X (front derailluer/2 rings/shifter)

[MichaelB]

Do the new levers have the same cable pull as Road shifters ?

Looking at replacing the RS505 levers with these new ones (already running 2x with 10-42 & 36/46)

[Nefarious86]

The Di2 levers look awesome!!

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[yinya]

Sort of like the question from before - can I run the new STIs, new rear derailleur RX810 with my existing crank and a 105 FD on a 2x11 setup?


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[ooo]

yes, they mechanical groups are compatible with current road

The Di2 levers look awesome!!

di2 lever ST-RX815 looks like ST-R785 + redesigned + extra weight:

ST-RX810: 611g (mechanical)
ST-RX815: 565g (di2)
ST-R785: 500g (di2)
ST-R8070: 360g (di2)

di2 1x rear deraileur RD-RX817 looks like RD-M8050 + same weight + minus fd compatibility:

RD-RX815: 288g (2x di2 CL=46)
RD-RX817: 322g (1x di2)
RD-M8050: 319g (1x,2x,3x di2 CL=48.8)

[TheRich]

Curious about adding servowave to road disk, seems like between the texture and possible lowered lever effort they could be the hot ticket for gravel and road. There's also possible changes from the pivot relocation as well.

As someone who rides a MTB with Saint brakes, increased braking power means lower lever effort, which means less fatigue, less panic, and better modulation...it's easy, you just don't squeeze that hard.

[SilentDrone]

The current road stuff has servo wave


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[SilentDrone]

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[ultimobici]

The cassette comparability for 2X seems a little narrow. This was a perfect opportunity for Shimano to open up cross compatibility for all their Di2 groups so as long as you used the appropriate mech & chainset or cassette it would work. Still, these offerings are interesting.


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