New GRX this year?
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I'm sure the 10-45 cassette will be usable for 1x, but not 2x; IMHO the intermediate ratios are worthless for anything vaguely road-like in any case. We really need to see whether there are mechanical 12 speed GRX levers, and also what they do about clutched RDs. Once there's actual product out there (2024-5???) we can experiment.
Re 11-42 and 2x: On bikepacking.com they often have features on "Rigs of..." before major events and there have been quite a few bikes with the 2x GRX RDs and 11-42 cassettes, and even one with 11-46(!). Jay Petervary won the Tour Divide in 2022 (or maybe 2021) using 46x30 + 11-42 and it's documented on YouTube, where he gives a run through of his complete bike + gear setup. Even the Ultegra RX RD (also rated to 34T for 2x) works fine with 11-40; I had 42x27 + 11-40 in 2019 and there was enough wrap that all gears had tension. Shimano ratings are *very* conservative!
Re 11-42 and 2x: On bikepacking.com they often have features on "Rigs of..." before major events and there have been quite a few bikes with the 2x GRX RDs and 11-42 cassettes, and even one with 11-46(!). Jay Petervary won the Tour Divide in 2022 (or maybe 2021) using 46x30 + 11-42 and it's documented on YouTube, where he gives a run through of his complete bike + gear setup. Even the Ultegra RX RD (also rated to 34T for 2x) works fine with 11-40; I had 42x27 + 11-40 in 2019 and there was enough wrap that all gears had tension. Shimano ratings are *very* conservative!
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https://www.adrisport.com/index.php/laventure-grx820/
Another bike listed with 820. In this case 48/31 11-34
Another bike listed with 820. In this case 48/31 11-34
Cervelo P5 Disc (2021) 9.1kg
Factor Ostro Gravel (2023) 8.0kg
S-Works SL8 (2023) 6.3kg
*weights are race ready, size 58/L.
Sold: Venge, S5 Disc, Roubaix Team, Open WI.DE, Émonda, Shiv TT, Crux, Aethos, SL7
Factor Ostro Gravel (2023) 8.0kg
S-Works SL8 (2023) 6.3kg
*weights are race ready, size 58/L.
Sold: Venge, S5 Disc, Roubaix Team, Open WI.DE, Émonda, Shiv TT, Crux, Aethos, SL7
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- ultimobici
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50X10 on a gravel bike? Where on earth does anyone on 700C have a need for a gear that big? I live in the Dolomites and I have yet to run out of gears on a road bike using 52X11 with 700X28C. Even on gravel where there is more need to pedal on descents, I have never wanted for a higher gear. Unless you're on 650B where are you actually using a gear bigger than a World Tour rider's top gear?
You spend much less time in the small sprockets and you have a bigger chainring, so it's an efficiency win. It has nothing to do with bombing descents.ultimobici wrote: ↑Tue Jan 24, 2023 12:48 pm50X10 on a gravel bike? Where on earth does anyone on 700C have a need for a gear that big? I live in the Dolomites and I have yet to run out of gears on a road bike using 52X11 with 700X28C. Even on gravel where there is more need to pedal on descents, I have never wanted for a higher gear. Unless you're on 650B where are you actually using a gear bigger than a World Tour rider's top gear?
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From what I've heard, components are cross compatible with road.
So battery of current gen Road works with GRX Di2, STIs of current road work with GRX derailleurs. That's pretty nice, as I really only need the Rear Mech with the clutch ...
So battery of current gen Road works with GRX Di2, STIs of current road work with GRX derailleurs. That's pretty nice, as I really only need the Rear Mech with the clutch ...
Cervelo P5 Disc (2021) 9.1kg
Factor Ostro Gravel (2023) 8.0kg
S-Works SL8 (2023) 6.3kg
*weights are race ready, size 58/L.
Sold: Venge, S5 Disc, Roubaix Team, Open WI.DE, Émonda, Shiv TT, Crux, Aethos, SL7
Factor Ostro Gravel (2023) 8.0kg
S-Works SL8 (2023) 6.3kg
*weights are race ready, size 58/L.
Sold: Venge, S5 Disc, Roubaix Team, Open WI.DE, Émonda, Shiv TT, Crux, Aethos, SL7
TrainerRoad is saying this:
new groups will be called 820 and 610
both are 12s, cross compatible and offer 1x and 2x options
1x is mullet compatible with XTR (11-51)
2x is keeping its‘ chainring sizes of 46/30 (610) and 48/31 (820)
the standard cassette is not micro-spline, with an 11-36 cassette (like on the 12s 105)
https://www.trainerroad.com/forum/t/shi ... 0/77606/37
new groups will be called 820 and 610
both are 12s, cross compatible and offer 1x and 2x options
1x is mullet compatible with XTR (11-51)
2x is keeping its‘ chainring sizes of 46/30 (610) and 48/31 (820)
the standard cassette is not micro-spline, with an 11-36 cassette (like on the 12s 105)
https://www.trainerroad.com/forum/t/shi ... 0/77606/37
- robbosmans
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Would make sense they use their new XT Di2 derailleur
- ultimobici
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Not sure it will work with normal Di2 levers.
- robbosmans
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I don’t see why it wouldn’t, the 11s mtb di2 worked with the 11s road di2
- ultimobici
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I know. However the new 12 speed is for e-bike only. In the same way that Shimano have blocked mixing mechs from MTB & road, I would not be surprised if they block non e-bike use.robbosmans wrote: ↑Wed Jan 25, 2023 4:52 pmI don’t see why it wouldn’t, the 11s mtb di2 worked with the 11s road di2
I've run it on 2 bikes, Shimano DA 12spd with long b screw as well as SRAM Red AXS w/ Wolftooth or AXS XPLR. While it is not listed as 2x compatible, AXS XPLR will work with front derailleur in my experience.
Exactly. I'd be fine with 48/34, but that's not a thing unfortunately.RDY wrote:
You spend much less time in the small sprockets and you have a bigger chainring, so it's an efficiency win. It has nothing to do with bombing descents.ultimobici wrote: ↑Tue Jan 24, 2023 12:48 pm50X10 on a gravel bike? Where on earth does anyone on 700C have a need for a gear that big? I live in the Dolomites and I have yet to run out of gears on a road bike using 52X11 with 700X28C. Even on gravel where there is more need to pedal on descents, I have never wanted for a higher gear. Unless you're on 650B where are you actually using a gear bigger than a World Tour rider's top gear?
markdjr wrote: ↑Thu Jan 26, 2023 6:11 amI've run it on 2 bikes, Shimano DA 12spd with long b screw as well as SRAM Red AXS w/ Wolftooth or AXS XPLR. While it is not listed as 2x compatible, AXS XPLR will work with front derailleur in my experience.You just swapped to a longer B-screw bolt and it worked on the DA12s? Pics of both setups?RDY wrote:
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