My Smart Control Won't Calibrate

If you're on a Smart Control trainer and seeing "Preparing Calibration" continuously without a successful calibration or your calibration attempts are taking longer than about 45 seconds and end up back at square one, the following information will help you get going. Please check the lists and follow all the steps below to be sure you're using calibration best practices and that you haven't potentially overlooked an important step to have consistent and accurate calibrations.


The Software and Firmware:

  1. UPDATE THE FIT APP: Be sure that you have the latest version of the Kinetic Fit app running on your device. Check the Apple App Store or Google Play.
  2. REDUCE BLUETOOTH INTERFERENCE: Make sure your Smart Control trainer isn't paired to any other apps.
  3. UPDATE FIRMWARE IF NEEDED: Launch the Kinetic Fit app and pair with the Smart Control trainer and check for firmware updates by selecting SENSORS from the menu and then selecting your trainer and the GEAR ICON. Select UPDATE FIRMWARE if prompted. Currently version 1265 is the newest firmware. If you update firmware be sure to POWER CYCLE THE TRAINER: unplug the trainer and plug it back in after the firmware update is completed.


The Hardware and Bike

  1. TIRE PRESSURE: Make sure your air pressure on your tire is at manufacturer recommended volume.
  2. USE A TRAINER TIRE: We recommend using the Kinetic Trainer Tire or a similar slick-treaded, soft-compound tire.*
  3. TIGHTEN YOUR ROLLER PROPERLY: Be certain that you've tightened the trainer's tire roller tension knob to 2.5 to 3 FULL turns past the point at which the tire and roller make good contact. You might feel like the tension is too tight. You might need another half turn too, but start with 2.5 to 3 turns.
  4. CLEAN THE TIRE AND ROLLER: If you have isopropyl or window cleaner, clean your tire and the roller before calibrating. 
  5. 7 SECONDS IS THE SWEET SPOT: Now, just select your workout in the Fit app or Free Ride and go through a normal 10-MINUTE warmup and calibrate. You want to get a calibration number as close to 7 seconds as possible. If you calibrate outside the 6- to 8-second range we recommend tightening or loosening your roller tension accordingly and trying to get to 7 seconds.

If you've done the prep listed above and you're using a slick tire you should have a successful calibration.


*Some issues we've seen causing calibration failures include:

  • Low tire pressure. Set tires to manufacturer specifications.
  • Trainer roller tension too loose (tire should not slip if you grab it and give it a solid yank)
  • Jumpy our out-of-true wheels will often cause calibration issues
  • Puncture-resistant tires and tubes can impede proper calibration. Try a trainer tire and standard tube.
  • Knobby tire tread will make it very difficult to get a good calibration.

Any of these can cause a calibration failure. If you continue to have issues, please submit a ticket via our contact page or even better through the Fit app.


Calibration Tips:

  • COLD CALIBRATE YOUR SMART CONTROL: If you're riding in Zwift or other compatible 3rd-party training apps and you don't want to do a full 10-minute warmup in the Fit app, just bypass the warmup and go straight to calibration. The only difference is instead of shooting for a 7 second calibration, you should calibrate closer to 6 seconds with a cold resistance unit. Our testing experience shows that a cold calibration of 6 seconds will warm up after ten minutes of riding to get you into that 7 second calibration range. Accuracy should be unaffected and you'll save several minutes in the Fit app.


  • SAVE YOUR PREVIOUS CALIBRATION: You may not need to calibrate the resistance unit every time you ride if you're using Zwift of another compatible app. Just DON'T loosen the roller between rides, clean your tire with isopropyl and refill your tire to the same pressure it was before before your last ride and go. Calibration numbers are saved in the Smart Control firmware and won't be affected if the roller tension and tire pressure are the same as the previous ride.


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