Calibration issues are generally easy to fix. Please follow the check lists and suggestions below. Make sure you're doing everything according to the best practices outlined here:
The Tire Setup:
- Trainer tires work best due to increased grip from softer rubber; road tires may work with some setups, but anything belted for flat protection is not a great choice.
- For standard road tires, 100 PSI is recommended. For all other tire types, we recommend setting the pressure to the maximum end of the pressure range listed on the sidewall.
- Be sure tire and roller are clean - give the tire and roller a quick wipe with a cloth doused in isopropyl alcohol or glass cleaner (let them dry and the interface is usually quite nice and sticky)
The Trainer setup:
- Reset the roller pressure: loosen the roller tension knob so that the roller is barely touching the tire
- Retighten the roller to three full turns of the adjustment knob
- Check to see that the roller and tire have no slippage by giving the tire a quick backward to forward pull
- If it seems loose or is slipping after the alcohol wipe and retightening, give the adjustment knob another 1/4 turn. This should be plenty of tension though.
- Complete 10-minute Warm up phase.
- Slowly accelerate past 20mph until prompted to stop pedaling by the app. The sweet spot for spindown times with a Kinetic Smart trainer or an inRide sensor is 1.5 to 2.0 seconds.
- Once app prompts with a "calibration successful" notification, proceed to workout.
These steps should prevent slipping and put you in the correct tension range for successful calibration.