| Forums » Quarq Discussion » Calibration (5 posts) |
| Calibration | |
|---|---|
SB1 year, 6 months ago |
Moved crank from one bike to another. Calibration had been all over the place for a while. This morning started at -281 and finished 75 minutes later at -303. Have been on the phone with Quarq over the last week concerning the calibration. Assume a change of 22 is an acceptable range? |
gv1 year, 6 months ago |
Whether it's acceptable is up to you - but it does appear to be normal. A change of 22 corresponds to an error of 22/32 Nm. Multiply that by 10 to get the error in Watts for a cadence of about 95 - ie 7 watts in your case. I reported a drift of 0.2 Nm (ie 2W) per degree C (or 20W over the 10 degree range I tested) and was told by Quarq support that this was to be expected. As someone who regularly rides 3-4 hour road races starting early on a Sunday morning, over which changes of 10 deg C or more are not uncommon, I personally didn't find it acceptable. |
jwhite41380791 year, 6 months ago |
Shouldn't backpedaling during the ride re-zero? |
packetloss1 year, 4 months ago |
So if the calibration is off by 22 such that when you started you had a calibration of 100 and when you finished the calibration came up with 122 would that mean it was under reporting your wattage by 7 watts or over reporting? |
sciguy1 year, 4 months ago |
I'm pretty certain that if zero offset goes in a more positive direction during the ride without re-zeroing then the end of the ride will over report your power. We're in Kona right now prepping for Oct. 9th and doing a good bet of re-zeroing. Temperatures out in the lava fields have consistently been over 100F with temps back in Kona closer to 75F at 8:00am. FWIW the SRM on my bike shows a very similar zero-offset shift with temp and is more of a pain to re-zero on the fly. YMMV Hugh |
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