Can a loose and creaking BB affect power readings?

Frame is PF BB92, Boost, GXP crank. Round chainrings.

If the hole is too big, isn’t this a warranty issue? I had a frame replaced for this issue.

Check out some of Hambini’s YouTube rants about shoddy frame making - this is one of the things he sometimes finds. Warranty it.

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Depending on the Quarq loose chainring bolts (even just one) can contribute to rising power over time and/or invalid power numbers.

Who makes the frame? I spent two years chasing a creak on a S-Works before it was warrantied. If it has a lifetime warranty you may not be out of luck. After all, that is a manufacturing defect.

Any yeah, the Hambini video on this is interesting!

Do you make a note of the zero offset number when you calibrate the Quarq through your headhunt. I believe if it jumps more than 50 points then that indicates there could be an issue.

Correct per the manual:

Power Measurement & Zero Offset Issues
• The power meter is giving very high or low power readings.
• The zero offset value is greater than +/-1500.
• The zero offset value is frequently changing by more than +/-50 points.

As the Quarq is solid, I would keep that over any pedal based system.

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Most suppliers have a lifetime warranty against manufacturing defects for the original owner. You’ll probably need your receipt or have your shop confirm you are the original owner.