Shimano 12 speed GRX part list RX820/RX822/RX610 (mechanical)

[henau212]

https://www.youtube.com/watch?v=TIBLTumsxQM

A 10-45 cassette is much better in terms of range and also suggests potential cross compatibility with the mountain bike equipment.

However, would this necessitate a move to Microspline?

Yes, no 10 sprocket with HG. All 10 are Microspline(Road).

[RDY]

The problem with the proposed drivetrains is that one can have either reasonably wide range (though not wide enough) *or* close ratios (though not in the midrange). Unlike some, I actually liked the 11 speed HG-800 (11-34) cassette, and IME the best thing about it is close-ish ratios everywhere, 11-13 excepted; there are no other nasty gaps. The 12 speed road cassettes go 21-24-27/28 versus 21-23-25-27 for HG-800, IMO much more disruptive.

I'd say the chance of any new 12 speed cassettes appearing from Shimano are zero, but maybe there will be more third party options, like Ingrid's 11-44 and Sunshine's 11-42 & 11-46. Hopefully somebody like S-Ride will make a suitable 2X RD compatible with the GRX 12 levers.

Just why Shimano would try to force the road-12-only freehub bodies down everyone's throats is beyond me; they should abandon that idea immediately or they will sell fewer wheels.

As for the 11 speed 11-40/42/46 Shimano cassettes, the 11-40 is just about okay (except for 21-24), 11-42 is considerably worse (esp. 24-28), and 11-46 also has a huge gap into low gear (37-46). They may be fine if you have no interest in maintaining a reasonably even cadence; given that's usually impossible when mountsin biking, gaps aren't so much of an issue there.

Ingrid seem confident that the 11-44 will work with 2X.

[maurice1]

https://www.youtube.com/watch?v=TIBLTumsxQM

A 10-45 cassette is much better in terms of range and also suggests potential cross compatibility with the mountain bike equipment.

However, would this necessitate a move to Microspline?

I believe so. 10T is too small to fit on HG hubs I believe. I think overall a move towards MS standards would be a positive thing, they seem more reliable, idiot-proof and offers the 10T option
I don't see why 10-45 wouldn't be doable in 2x, I'm enjoying 11-40 on my 2*11 GRX and some people claim to run 11-46 double without too many issues. I'm hopeful it won't be a disaster groupset. Just needs new gen di2 for me.

[CampagYOLO]

https://www.youtube.com/watch?v=TIBLTumsxQM

A 10-45 cassette is much better in terms of range and also suggests potential cross compatibility with the mountain bike equipment.

However, would this necessitate a move to Microspline?

Yes, no 10 sprocket with HG. All 10 are Microspline(Road).

Thought so. Must say I'm pleased that Shimano haven't done a 105 and that a mechanical version of 12 speed GRX is definitely a thing.

[maurice1]

https://www.youtube.com/watch?v=TIBLTumsxQM

A 10-45 cassette is much better in terms of range and also suggests potential cross compatibility with the mountain bike equipment.

However, would this necessitate a move to Microspline?

Yes, no 10 sprocket with HG. All 10 are Microspline(Road).

Thought so. Must say I'm pleased that Shimano haven't done a 105 and that a mechanical version of 12 speed GRX is definitely a thing.

GRX shifters are pretty much rebranded mechanical levers anyway. It was rumored long ago mechanical 105 would be coming for mid 2023, so it sort of makes sense to have them ready at the same time as GRX mechanical

[Aeo]

GRX 12sp is much more comparable to Shimano's 12sp MTB groupsets. They are all mechanical, so it is not a huge surprise that GRX 12sp is mechanical, and might be mechanical only for some time. (Yes I know about the e-bike XT Di2 groupset, no nitpicking please )

Let's hope Shimano does not pull a 105 and every level of 12sp GRX has Hyperglide+ cassettes and chains.

[maurice1]

Unfortunately I would assume the cassette they are going to use on the 2X grx is just going to be the 11-36 from R7100. The 10-45 is probably only going to be advertised for 1X

[pdlpsher1]

Maybe or maybe not. The current 11-34 12-speed cassette has ratios more suitable for road than gravel. Shimano will likely keep the existing 11-34 12-speed cassette for the faster gravel riders and make a new 11-36 with gravel ratios for the more casual and mortal riders.

12-speed 11-34
11-12-13-14-15-17-19-21-24-27-30-34

11-speed 11-34
11-13-15-17-19-21-23-25-27-30-34

Possible new 12-speed gravel-specific 11-36 with HG+
11-13-15-17-19-21-23-25-27-30-33-36

[Aeo]

2x12 MTB groups had 10-45 cassettes. Shimano has the tools to gap their competition regarding gear range and shift quality

[bikewithnoname]

What were the Unbound riders using? Was 12spd GRX but I've not seen anything more than that

[pdlpsher1]

Some more pics taken at Unbound.

https://www.ridinggravel.com/gravel-new ... nd-gravel/

[polpy]

Why are the shimano mech shifters so large/ugly?

[saba]

Some more pics taken at Unbound.

https://www.ridinggravel.com/gravel-new ... nd-gravel/

Nice find. Interesting to see 12 speed mechanical in the flesh.

The loose fitting rubber hoods still persist.

[henau212]

Also some pictures and Information here: https://www.bikeradar.com/news/shimano-grx-r820/

[Aeo]

James Huang article https://escapecollective.com/next-gen-s ... er-mullet/