- Make sure that you are in a gear that will allow you to speed up beyond 25 mph.
- Press "F3", or, the CENTER BUTTON on the BOTTOM ROW. You should see the screen on the handlebar controller change from the word "PRO" or "PROe" to a speed. Go ahead and speed up by pedaling faster until you see dashes appear on the controller screen.
- STOP PEDALING WHEN YOU SEE THE DASHES!!!! REPEAT - STOP PEDALING WHEN YOU SEE THE DASHES!!! Let the wheel coast down to a stop.
- Do not pedal! Instead, look at the handlebar controller screen. Ideally we want the top screen to read between a 1.8, and a 2.5. This is in pounds of pressure being placed against the tire. It is called press – on force. If the top number is above or below this range, call a coach over so that he or she may make adjustments to increase or decrease the force against the tire.
- If the top number is between the ranges of 1.8 to 2.5, press the bottom center button again, and look in the upper right-hand corner of your dashboard. The RRC value is interpreted as the rolling resistance calibration. If the value is green, and is between 1.8 and 2.5, then all is well. If there is a no reading, then you need to repeat the above process. If the top number is outside of that range, once again, get a coach to make the adjustments, do not hop off the bike and attempted your self, and repeat step three. Once you are in range, press that "F3" button in the bottom center row, and again, look at the dashboard in the upper right-hand corner.
Once you get comfortable with calibrating your you will begin to feel more confident in your ability to set up the bike and rear wheel properly. A proper rolling resistance calibration is critical to ensure good values, and a better workout. Sometimes we will ask you to calibrate twice, especially if you calibrate before warming up completely. And as a rule of thumb, you can assume that every .01 pound of pressure is worth one half of 1 Watt in terms of accuracy. Once Compu trainers have warmed up, they do not drift much at all, and their accuracy is within 1%. We have copy trainers in the studio's that are perpetually being rotated through to racer mate in Seattle for calibration with their machines. This is to ensure that your data remains accurate, consistent, and helps you improve your power output, your power to weight ratio, and measure your energy output.
Fore more in-depth information, I'm going to pull from the script itself, found in the CompuTrainer manual...
"An error during calibration of 0.01lb equates to a change in load of 1/2 W at a speed of 25 mph. You may wish to recalibrate more than once to confirm that your rolling resistance value is consistent to within .05 2.10 pounds. If the value continues to drop for two consecutive measurements, this indicates that the tire and load generator may not have yet reached a stabilized operating temperature. Continue to warm-up and repeat."
At Cycling Ctr., Dallas, when we use slope based intervals, we limit the grade 2 no more than 6%. If you are a fit cyclist, with a high FTP, then setting a press on force, or RRC, to about 3.00, is not inappropriate. Again, the lower your FTP, the lower you can set your RRC. Here's a table to help you out...
|Fixed-Gear Workouts or Non-Slope Interval Workouts...||Use an RRC of between 1.8 and 2.5lbs.|
|Slope Intervals up to 3% or Intervals with Sprints...||Use an RRC that's higher, closer to 2.5lbs.|
|Slope Intervals up to 6%...||You may set your RRC press-on force up to a 3.00...|