I have a 10 speed sram red quarq that I’d like to use on my new bike that is equipped with an 11 speed Di2. Is it as simple as just upgrading the current 10 speed chainrings to new sram red 22 or force 22 chainrings to make it compatible? Any advice would be greatly appreciated. Thanks
My understanding is that all you’ll need to change to go 11sp is the right shifter, the chain, and the RD.
The rest of your existing setup should work fine.
my new bike is equipped with shimano dura ace Di2 11speed FD, RD, Shifters, Cassette and chain. The original crankset is 11speed compatible but i’d like to use my quarq over the standard crankset, but my quart is not a sram red 22.
Assuming BB compatibility, the quarq should work fine.
so no need to change out the chainrings? BB is compatible with a conversion kit i purchased.
thanks
Nope.
My understanding is that the only difference in the 11sp chain and 10sp chain is the external width. They reduced the spacing between the cogs on the cassette to make room for 11 gears. So, they had to make the chain narrower externally. But the size of the cogs is the same, and therefore the 11 sp chain will fit onto the rings of either crankset, but a 10sp chain won’t fit between the cogs of an 11sp cassette.
If nothing else, try it. If doesn’t work, try the different chainrings.
But, it’ll work. 
Quarq told me the only difference between the Red and Red22 is the supplied rings and the red letters “22” on painted on the crank arms.
That is great news. I’m going to try this out and I will let you know the outcome.
Thanks
The difference between 10 and 11 speed crank sets is very simply the rings installed. There is a slight difference in the thickness of the rings but the spider is the same. As for the Quarq, everyting with a CR2032 battery and an LED features Omnical so you can simply install the new rings to the spider and no adjustment to the slope should be needed. The RED models do have a hidden bolt so the new ring will need to have a Quarq Captive Nut pressed in to the new ring at the hidden bolt location.
Cheers,
Rob Bee
Quarq Tech Service
Will an 11sp chain work on a 10sp crank?
Yes. Plenty of people with 10 speed setups run 11 speed chains to reduce noise.
I know it’s being done successfully. I was just curious what the quarq rep would say.
Leonard Zinn responded to this questioin in the Velonews website. However, the question was pretty much related to crankset compatibility with Sram Red 22 versus Sram Red 10 speed. Like you the OP also wanted to use his Quarq PM (10 Speed) but with a new Sram Red 22 group (wherein you want to use it with the DA Di2 11 speed).
According to SRAM:
"Ten-speed chainrings can be installed on an 11-speed crank, just as 11-speed chainrings can be installed on a 10-speed crank. The spiders are identical. However, all of our groups are designed to function as complete groups, so if a 10-speed crank is installed in an 11-speed group or vice versa, we strongly recommend changing to the appropriate chainrings. Ten- and 11-speed should not be mixed. Our 22 groups actually have the chainrings slightly farther apart than our 10-speed groups, in order to ensure that all cogs can be safely reached in the small ring, and the chain and front derailleur are specifically designed to work with that gap. Running a 10-speed chain on 11-speed rings or an 11-speed chain on 10-speed rings could cause chain jams or derailments.
So yes, purchase the power meter of your choice, knowing that it will still be usable when you go 11-speed, but make sure you have 10-speed rings on it when you run it with a 10-speed group.
—Dan Lee
Public relations specialist, road and cyclocross, SRAM/Zipp/Quarq "
Read more at http://velonews.competitor.com/…#2eoWlduHr0YSbk9j.99
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I have yet to see anyone publish actual specs including critical dimensional differences between 10 and so called 11 speed chainrings. I am suspicious that this is just marketing talking instead of engineering. I’ve installed lots of 11 speed drivetrains on 10 speed cranks, without any issue or chain drops etc. If anyone can supply this info it would be great. Until then, I am extremely skeptical of this.
I would not be surprised if Rob of Quarq is following this thread. He frequents ST and has been a great resource regarding Quarq PMs. Feel free to call him out. I admit I would like to see the outcome of this because I have a 10 Speed Quarq Elsa PM and am building an 11 Speed Shimano Di2 groupset.
I would not be surprised if Rob of Quarq is following this thread. He frequents ST and has been a great resource regarding Quarq PMs. Feel free to call him out. I admit I would like to see the outcome of this because I have a 10 Speed Quarq Elsa PM and am building an 11 Speed Shimano Di2 groupset.
See posts 9 and 10 above.
Yup, i read that but that’s not enough info. “Slight difference” in thikness? Why? To prevent chain rub? What does that have to do with dropped chains? And why then, did Praxis move to saying that their rings are 11 speed compatible without changing anything? There is just not enough info out there to help me understand what the difference is. And as I said before, it makes me suspicious. Because in other cases, manufacturers are quick to play up and emphasize the detailed differences. In this case, its all quiet out there.
Yup, i read that but that’s not enough info. “Slight difference” in thikness? Why? To prevent chain rub? What does that have to do with dropped chains? And why then, did Praxis move to saying that their rings are 11 speed compatible without changing anything? There is just not enough info out there to help me understand what the difference is. And as I said before, it makes me suspicious. Because in other cases, manufacturers are quick to play up and emphasize the detailed differences. In this case, its all quiet out there.
I’m guessing you weren’t intending to reply to me, because I agree. Particularly when people are running it successfully.
Yes. Totally agree.
I have yet to see anyone publish actual specs including critical dimensional differences between 10 and so called 11 speed chainrings. I am suspicious that this is just marketing talking instead of engineering. I’ve installed lots of 11 speed drivetrains on 10 speed cranks, without any issue or chain drops etc. If anyone can supply this info it would be great. Until then, I am extremely skeptical of this.
I can certainly see that conversation happening…
Engineer: “Hey guys, we were able to design the new 11spd to work with our old 10spd cranks. It’ll save us time in design and be one less part the customer has to upgrade!”
Marketing: "New 11spd crankset performs way better and is the only compatible crankset with our new 11spd drivetrain!
It’s possible that it is slightly different, but the difference is probably only seen when it is perfectly setup and likely quite minimal if so many are seeing no issues otherwise.