New Shimano GRX Di2 12-Speed Group (May 2024)

Me either. I only hinted at my own confusion with the various product lines from SRAM since I have not bothered to dig into them.

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Yeah, I know there are people who do things like this, but I don’t think it’s hard to understand why the average person who spends $5K plus on a bike doesn’t then want to spend another $1K replacing brand new components.

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Oh for sure. I get that. I guess my thought is that if you’re looking at upgrading your groupset to 12sp Di2, you have the money to get the setup you want. Nobody needs Di2. Just like nobody needs a $5000 bike.

48x11 @ 120 rpm = 67 kph/42 mph
52x11 @ 120 rpm = 73 kph/45 mph
That’s getting close to my max comfort zone. YMMV

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Side note: this is one of the big downsides to brands buying up all the local shops. I used to be able to go to my shop, who sold multiple brands, and talk about buying a frame and building it up. If I want to do that today, I either have to buy Spesh or find a new shop. I drove an hour yesterday to go to a shop that sold both Spesh and Cervelo and the salesperson who approached me did not know what a Crux OR an Aspero was. They had to look it up. Yeah, you’re not building up my new bike…

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Where did you find that? Is that supposed to be km per hour?

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Any ideas how to do a 2x GRX crankset with 165mm crank arms? These look to be limited to 170. To take full advantage of Hyperglide+, do you need compatible chainrings like you do for the cassette?

Best thing I did was learn how to all my own wrenching. Saves me money and I trust myself over most people. Plus there’s nobody to blame but myself. The only thing I can’t do is build a wheel. But all my bikes are built from the frame up with all the parts I pick out specifically. It almost always is cheaper as well which wasn’t always the case. If I buy a prebuilt bike the bars are too wide, the stem is too short, the cranks are too long, and the wheels usually aren’t great.

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Yeah, seems likely per a quick cross-check. I used a 700x32 tire.

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Oops. Fixed.

MMVs

Or YKMV.

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Rotor sells a crankset that is designed to work with GRX which crank arm lengths down to 155mm. I am getting one on my bike right now, so should know how well it works soon enough.

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I suspect the lack of 1x at launch is because the rear mech is going to be so similar (if not identical) to the MTB groupsets that they can’t release one without the other.

I’ve noticed the language in launch videos tends to be “no 1x option… yet” so I suspect they all know it’s coming.

I also spoke to a boutique bike brand at a race a few weeks ago who told me their pre-orders were in but they won’t get any GRX di2 til next year. I thought that was really weird since I was pretty sure this launch was coming imminently. But that brand is 1x only so now it makes sense - as long as 1x is still coming eventually.

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I ride my gravel bike for all my long road rides.

46/33 up front and 10/36 in the back. If I wasn’t so fat I could do a 48/35or a 50/47.

On the road if you want more then a 50 front you need to buy a 52 or 54 crank and a different front derailleur. I have thought about going to a 56 front on my road race bike to not have lower cog loss.

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Is the RD compatible with Road levers, RD and Crank?

It was on 11s and given that the firmware update also hit 9270/8170/7170 today I’d imagine that’s still true this generation. We’ll probably see a lot of cutsom mixed builds depending on preferences for lever style, chainring sizes, etc.

I have a friend that successfully dialled a 105 FD-R7150 front mech out far enough to clear GRX rings and I know that FD is unique in retaining the adjustment screw that disappeared from DA/Ultegra. Pretty sure RX825 kept the screw too, which makes me wonder if that FD will be able to do the reverse and dial inboard enough to accommodate road chainsets. If not (and this will certainly be the case in Shimano’s official compatibility charts), then it will require matching the FD to the chainset family.

I’m surprised they skipped on the 1x option for this release. The upside being I’ll now definitely do the cheap GRX 11spd cage swap to get 11-51 with that given it’ll be a while before we see the 1x Di2 GRX land.

Side note: The new single button front derailleur shift option is pretty neat. Still yet to see the firmware land for that on the 12spd Di2 road groups.

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I was thinking the same thing, but the MTB version almost certainly will be fully wireless unless they have something up their sleeve for a MTB frame battery mount

Really shocked to not see 1x at the launch. That seems to be the direction everyone is going on gravel, be it sram or mechanical grx. Theres gatta be a reason, and its certainly coming, just odd to not have this at launch

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Yeah, I think 1x is going to have a totally different battery setup and be truly wireless. I might guess XTR with this new battery released (or at least visible on key athletes’ bikes) before the Olympics, then similar GRX 1x to follow.

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