For the best conditions for app calibration, the roller should only be tight enough to prevent the tire from slipping. Any tighter than and it may prevent you from getting a successful calibration with the inRide app. The resistance comes from shifting gears and going faster, just like riding outside, rather than cranking down the roller tension knob.
Tips for roller tension, app calibration and power curve accuracy:
Roller tension: with the proper tire and tire inflation you shouldn't need to tighten much beyond 2 full turns after the tire and roller begin to touch. We suggest tightening and then checking for wheel slippage with a quick tug back and forth on the rear tire. After the initial 2 full turns, try adjusting in 1/4 turn increments if needed.
Recommended best practices:
- Use a trainer tire (ours in particular) they are usually made of a softer rubber compound that will grip better on the roller (https://kurtkinetic.com/blog/posts/choosing-the-best-tire-for-the-trainer/)
- Be sure tire is inflated to manufacturer spec at the beginning of each ride. It's not uncommon for tires to lose a bit of air pressure after just a day.
- Periodically clean the tire and roller with a rag and some isopropyl alcohol. After the alcohol evaporates you'll have a nice sticky interface.
- Don't skip the 10-minute warmup prior to calibration. The few minutes of spinning ensures that the tire is warmed up and that any air in the fluid chamber has adjusted temperature.
Summary: You'll have the most accuracy from day to day with the inRide app if you vary the roller tension as little as possible, stick with the same tire, keep it clean and keep it filled to the same PSI.