After using the app for installation calibration, how do you ensure that the two wheels are tightly clamped together and won't slip?

Hold the PikaBoost 2 wheel up to the bike with one hand and turn the bike wheel with the other. If the bike wheel cannot turn, it means the installation is tight. If it's still not tight after installation calibration, you can lift PikaBoost 2 by the tail light and perform the calibration function again. Make sure the bike tire does not leave the ground when lifting, as it could affect the slope detection accuracy.