Just upgraded to 1x13 XPLR and like it so far. Except that the Quarq power meter reads way too high. As always when I get a new power meter I do a few comparison rides indoors and outdoors. Inside I have my Wahoo Kickr and Assioma pedals. Outside it’s just the Assioma pedals. The Quarq is reading 10-13W higher than the other two power meters. It replaced a Sigeyi that was within 2-3W of the Assioma, so it’s definitely the outlier. I’m fine with a few watts but it’s pretty far off. Is there a way to calibrate it? Or do I just accept that Quarqs aren’t as accurate? Not sure what else to do.
I recently upgraded to the same spider and I’m not seeing anything weird. I have other quarq’s (maybe all are high?), but also an old powertap wheel as a point of comparison. It would be hard not to notice 10+ watts.
In the DCrainmaker testing, he found the quarq threaded spider to be within 1-2 watts of the assioma pedals (typically pretty accurate also) when tested together. If you have the 2 sided pedals and you are testing those on the new SRAM spider and seeing that big of a difference in real time, I’d say something is wrong. If you only have 1 sided power on the pedals, that could explain the difference since the spider is obviously measuring total power. I know there is a way to manually change the slope on the quarq, but not sure what the process would be to align with your pedals.
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I have both the Assioma DUO and the new Look version of the Pro pedal, both are dual sided. Just did an ERG ride indoors using the Wahoo Kickr Core 2, Assioma DUO pedals, and Quarq AXS thread on power spider. Wahoo and Assioma within 3-4W over the entire workout. Quarq reading anywhere from 15W high up to 20W high in my SweetSpot intervals.
Ride yesterday was outside with the Assioma Pro (Look) and Quarq. That ride Quarq was 10-15W higher. So something is definitely wrong. I’ll reach out to SRAM.
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I had a similar issue when I moved my Quarq spider to different bike, it was reading way, way too high. The calibration readings from the SRAM app were super wonky so I retorqued the bolts and then it all seemed to be fine after that
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I’ve seen a couple wonky readings immediately after swapping rings on the old style spider also. I don’t think I’ve ever had to retorque the ring bolts, but just a few hard pedal strokes seems to get everything back to good. I’m constantly swapping rings and normally don’t see any weirdness, but I have seen it.
On this newer threaded design, there are no chainring bolts to torque, but the entire ring is basically tightened the first time you pedal after installing it. I’ve had this threaded style spider on my MTB for a couple years and have swapped rings many times and haven’t seen any weirdness yet. I just recently got the threaded spider for my gravel bike, haven’t needed to swap rings yet.
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You can adjust the slope on your Quarq to match other PM’s. I’ve only had one where I needed to do it (it was reading low in my case) but it does happen. (The new Threaded one on my current bike, the older ones were all dead on)
Just adjust the slope, test it to make sure you’re close, and then should be good after that. I test here and there but mine’s been consistent since initial adjustment. (May take a couple rides to figure out exactly how much to lower it, but pretty easy)
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Like the 8 bolts that connect spider to crank arm? I can try that.
Edit: Or the spider to the chainring? I have the new thread on chainring-spider combo.
Yeah, that’s what worked for me and then check the calibration numbers on the SRAM app are in sensible limits
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I’ll take a look. Thanks.
You could contact Quarq as well. The couple of times I dealt with them in the past their customer service was great.