Accuracy claims don’t usually take into consideration drift over time when cycle training with a power meter. Drift is when the power meter data is inaccurate due to temperature changes affecting the strain gauges. It can happen in one day, or over the course of a week or month. Power meters usually resolve this issue by re-zeroing before a ride, but that just indicates that the accuracy of your last ride had drifted. It was no longer accurate as claimed. Our new cycling power meters resolve drift by design and require no re-zeroing to keep the data accurate.