I have a Quarq Red crankset that I use with a X-Sync 1x chain ring. I emailed customer support ahead of time and they confirmed that it would work with no calibration needed. I suggest you email them as well and double check for your crankset.

The S975 doesn't have OmniCal, so Quarq will likely recommend you send it in for calibration with the new ring.

That's a really simple option, thanks!

Now, for some other advice, I picked up a cross bike that I'm trying to put an old power meter on (Quarq S975). This 1x solution looks like it will work, especially considering I plan to dual purpose it for road and gravel/cross. The Quarq is 130 BCD and it looks like at 130 BCD I can choose from 50T or 52T. That is fine for the road but will it give me enough climbing gear for the gravel/cross paired with an 11-32?

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Head Coach Grn Mchn Multisports Coaching, LLC
http://www.grnmchnmultisports.com

In a short answer....probably not. Most stock cross 1x bikes are in the 40T range. And that is with an 11-32 cassette.

Gotcha, the bike will come with a 40T crank that will also be GXP so I'll probably just have to plan ahead and swap cranks based on the type of ride and go without power for the aggressive terrain rides. Does anybody run a gear larger than 32?

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Head Coach Grn Mchn Multisports Coaching, LLC
http://www.grnmchnmultisports.com

SRAM also makes an 11-36 cassette. And also a 10-42. In both cases, you'd need the long-cage derailleur. And for the 10-42. you'd also need the XD driver body.

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"Non est ad astra mollis e terris via." - Seneca | rappstar.com | FB - Rappstar Racing | IG - @jordanrapp

Did that same exact thing on a BB30 version. Give it a go and then you can calibrate it via their Quarq app.

Andrew

The app calibration is solid enough to avoid the need to return to Quarq?

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Head Coach Grn Mchn Multisports Coaching, LLC
http://www.grnmchnmultisports.com

I found it to be, and Quarq customer service assured me of the same thing. I just took the weights I was going to use (25 or 50lbs, can't remember which) to UPS to weigh to get a accurate measurement for the cal procedure

Great, thanks!

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Head Coach Grn Mchn Multisports Coaching, LLC
http://www.grnmchnmultisports.com

My plan is to keep stock 40T crank to throw on for cross and when I'll need the gearing. For general road purposes (Training rides, hill interval, etc) I'll want power and think I'll put something like a 46-52T on the Quarq to gather power data when I care about it. I'm thinking the extended cassette on the rear should help me cover the gearing I'd normally use with a 2x. Any recommendations for a tooth number on the front? I'm running all on theory here and could use some experienced riders to help me make a decision. I'm also looking at options other than Sram x-sync since the smallest I can get is 50T in 130 BCD. Recommendations? Any reason this wouldn't work on the Quarq?

https://www.jensonusa.com/...f%20tooth%201x%20130

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Head Coach Grn Mchn Multisports Coaching, LLC
http://www.grnmchnmultisports.com

Gearing is very hard to recommend to people without knowing where you ride, how much you weigh, your FTP, etc. I'd recommend taking a look at http://www.gear-calculator.com and comparing your current setup to a new one. Think about what you currently use and if you think you need more top end, low end, or less large of jumps in between gears.

I am very familiar with road gearing, just not sure how it's going to translate offroad. I ride 53/39 with 12-25 on training TT bike, 55/42 with 11-28 on racing TT rig, 53/39 with 12-25 on road bike.
I am essentially trying to get the quarq to work as close as possible to my road setup, understanding that I won't have a 2x to fall back on but will have a bit more generous cassette in 11-32. At the same time, I'd love to be able to use the quarq in cross/gravel style situations but understand that 50-52T is likely too much for those applications, but I'll also have the stock crankset (40T lacking power) to fall back on if this blows up in my face. I could also keep trying different chainrings until I get it right but I'm hoping somebody else uses their 1x cross bike in a similar fashion and can help me Goldilocks it on the first try.

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Head Coach Grn Mchn Multisports Coaching, LLC
http://www.grnmchnmultisports.com

DSza2508, were you able to convert your Quarq S975 to a 1X? I'm thinking of doing the same. I have a S975 (GXP 50-34 Compact with 172.5 arms) on my tri bike, and I'm just not riding that bike as much. So I'm thinking of putting the Quarq on a cyclocross bike that I'm riding a bit more. I think it would be a fairly easy swap, as I think the bottom bracket on my cyclocross bike is GXP right now. So I think all I'd need to do is swap the chainrings, get it calibrated and then install it. Just wondering if it worked out ok for you.

That's exactly what I did. No issues for me.

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Head Coach Grn Mchn Multisports Coaching, LLC
http://www.grnmchnmultisports.com

They also make an 11-42 cassette that fits a standard Shimano/Sram drive body.

Keep it in the toolbox, swap it out for the 11-32 when cyclocrossing. Easier than swapping cranks back and forth.

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"They're made of latex, not nitroglycerin"

Thanks! Good to hear that it worked for you. I'll give it a try on my unit.

I have the 1x setup for road 48T with 11-32, no issues although mine is the 110bcd. The S975 is old and mine just took a dump. Apparently these are more likely to have damage so I would be very careful with #crosscoming. I also didn't have to send it in for calibration.

Thread about my broken one that I am in the process of repairing here: http://forum.slowtwitch.com/...F_P6395394/#p6395394

Bummer about your Quarq. I hope you can bring it back to life. I've had my S975 for about 5 years and so far, no issues. I haven't used it much over the past 2 years, as I just haven't been riding my tri-bike. Hopefully my conversion to 1X goes smoothly (it'll likely be an early fall project, I could use the current 1X chainring (Rival level?), but I'm thinking of getting a Force X-Sync).

If and when I fix mine it'll be going on my CX bike as well. Had it test fitted with a 40T sram force x-sync and it worked just fine.