How do I update my G3 hub's firmware?
On a PC:
- Open PowerAgent
- Plug in PowerCap with battery IN.
- Click "check for firmware update"
- When it says that firmware update is available, click OK.
- It will then notify you to take the battery OUT.
- Disconnect PowerCap, take out battery, wait 10 seconds, plug in PowerCap (battery is still OUT at this point)
- Click OK on the window that instructed you to take the battery out
- Firmware will install
- When it says that it was successful, unplug PowerCap
- Wait 10 seconds, plug battery back in
- Plug in PowerCap (with battery IN) and click configure device (button that looks like two blue arrows)
- It will then tell you what version of firmware you have. Current firmware version is 16.037.
Does the G3 have a Rechargeable Battery
The G3 PowerCap is not rechargeable. The USB connection is used for service and for firmware updates only. The PowerCap should not be left connected to the USB port for long periods. Doing so could drain the battery.
Will The G3 hub work with a Yellow Cervo CPU?
No, the G3 hub is now fully ANT+ compatible and will only work with the Joule or other ANT+ compatible device. The previous Plus series hubs still sent a signal on the PowerTap (formerly CycleOps) network that the Yellow CPU used. That signal is no longer sent by the G3 hub; however, the Pro hub does still work with the Yellow CPU.
Why and How Should I Zero The Torque Of My PowerTap?
- The torque must be frequently zeroed to ensure the most accurate power information is displayed. If the current power display is positive or negative while coasting the torque must be zeroed. This operation must be done while stopped with no tension on the chain or pedals, and the transmission icon illuminated.
- If your power seems incorrect, the torque may not be zeroed. Zero the torque as described on page 9 in the product manual.
How do I set up my Speed/Cadence Sensor?
- Remove the battery cover from the sensor
- Remove the battery
- Locate the small, blue switch. Flip it to Cadence or Speed, depending on the desired functionality
- Re-insert the battery
- Install the battery cover
- Learn the sensor to CPU
- Ensure your CPU is customized to receive cadence data properly
Why does my heart rate seem inaccurate?
- Computer or chest strap batteries are low: replace batteries as necessary while referencing the product manual. You may need to "re-learn" the HR strap ID through Main Menu > Sensors > Heart Rate
- The HR strap is not positioned properly. Please the product manual.
What length spokes do I need to build my new PowerTap G3 hub into my rim?
You will need to enter the rim measurements, along with the correct PowerTap hub dimensions shown below, and the cross pattern into a spoke calculator to determine the necessary spoke length. For additional questions please contact your local PowerTap dealer.
Wheel center to flange
Wheel center to flange
Spoke hole diameter: 2.5mm
Note: PowerTap hubs must be laced with a minimum 2 cross pattern to avoid damage to the hub and maintain the warranty.
Why is the data different between Garmin and PowerTap CPU?
Numerous differences exist between PowerTap and Garmin computers in regards to how data is displayed. To ensure minimal differences, you should verify the wheel circumference is correctly entered into both devices and that both devices handle ride stops, pauses, and resumption the same way. Garmin computers typically measure distance (and speed, depending on setup options) based on GPS data, and does not use the auto-pause feature by default. PowerTap computers measure speed based on wheel speed and distance based on the number of wheel rotations and uses an auto-pause by default. Garmin calculates average power output without zeros, while PowerTap does not by default, but there is a setting to change this (on both Garmin and PowerTap computers).
Directions on how to change settings on the Joule can be found in the product manual. Garmin does offer a POD that allows the 705 to read speed and distance using a similar approach to the PowerTap. Garmin computers tend to apply more smoothing to the data, which can cause discrepancies when compared to PowerTap computers.
Why do I get intermittent data transmission?
- Batteries need replacement in the hub
Why do I have no display on my computer?
- The computer may be asleep. Press one of the buttons on the computer to wake up the computer.
- Batteries need replacement or charging
- Is the computer is too cold? Optimum operating temperature is 30-100 degrees Fahrenheit.
- Battery contact inside the computer may be depressed. Remove the battery cover and battery to expose the silver battery contact. There should be sufficient spring in this tab. If there is not, GENTLY pull up on the contact to reform it.
How much memory does the PowerTap computer have available?
The PowerTap CPU allows you to change the data collection rate in COMPUTER SETUP 1. When you set up the PowerTap CPU (press MODE and SELECT buttons simultaneously until you get to the SETUP menu) you can select data collection for every one second or every two seconds. If you select one second the PowerTap will record up to 15 hours of data. If you select two seconds you will record up to 30 hours of data.
When riding, why does my cadence show all dashes or zeros?
- PowerTap cadence is accurate within 40 rpm and 130 rpm. Anything outside of this range will be recorded as a zero. Since the cadence measurement is a virtual cadence (based off of torque measurements) and not measured with an extra sensor it cannot read values outside of this range.
- If you're using the cadence separate cadence sensor, make sure the sensor is paired to the computer.
Why isn't my PowerTap computer showing watts?
- Ensure the hub is awake. Perform a "find" on the CPU and spin the wheel to activate the sensor.
- Zero the torque (see above FAQ).
- Replace the batteries in the hub and relearn the Hub ID in COMPUTER SETUP 5. Then perform a "find".
- Your computer may be in bike computer mode. The word WATTS should be displayed under the top row on the display. If it's not displayed, refer to page 26 of the product manual to return the computer to power mode.
How can I prevent the Garmin 705 from detecting multiple power meters?
To prevent Garmin computers from detecting multiple power meters, it is best to pair the PowerTap and computer about 50 feet from any other active power meters.
Why won't my Joule recognize my G3 hub?
Update your Joule to the latest firmware and relearn the hub. If you are using a Joule that hasn't been updated, make sure you learn your G3 hub as an ANT+ device, not a power tap.
I lost/can't find my download cable, how can I download my Joule?
Any off the shelf mini USB stick to standard USB stick cable will work. If you own a Blackberryor digital camera you already have this download cable.
Why can't I download my Joule?
Make sure you have the latest version of PowerAgent.
Make sure the download cable is plugged into your computer and Joule.
Make sure Joule is turned on. To turn Joule on press Mode or Interval button. The Home button will also work on the Joule 3.0.
Make sure you have "stopped and saved" a ride. To stop and save; hold Mode button for 2 seconds until Ride Paused screen appears. Select "stop and save".
What type of micro SD card is allowed in Joule?
Micro SDHC cards are not supported, i.e., any card larger than 2 gig.
How can I keep my Joule from inadvertently turning on in my bag?
3 of the 4 joystick directions are currently disabled from turning on the Joule. We're working on a future enhancement to disable the 4th direction.
How can I turn off my Joule?
You don't. It just goes to sleep.
My 2/4/8 week averages are off. How can I fix them?
There may be a short ride that can bring down your averages. Find the offending history file and delete it through Window Explorer. Cycleops/history/file name.bin
How would this occur? A rider completes a hard ride and hits "stop and save" as they're pulling into the driveway. As they're rolling the bike into the garage a new ride is created 15 seconds long with an average of 0 power. This short ride then gets factored into the averages. Consider using the "stop and delete" function.
What do VAM, Normalized Power, IF and TSS mean and what do I do with them?
VAM - How quickly the rider is climbing a hill. The rate of ascent in meters/hour. This feature is most effectively used in interval mode. Start an interval at the bottom of a large climb. Stop the interval at the top. See how quickly you're gaining elevation.
Normalized Power - An estimate of the power the rider could have maintained for the same physiological "cost" if the output power was constant.
IF - Comparison (ratio) of a ride's normalized power to the rider's threshold value.
TSS - Training stress score: an estimation of a ride's total difficultly based on glycogen burned.
[Normalized Power, IF and TSS are registered trademarks of Peaksware, LLC http://www.trainingpeaks.com]
Why don't I see the ride information on the dashboard or in the reports after I stop and save?
The information is stored in the history files after a "stop and save."
Why is the altitude different than a Garmin?
Both the Joule and the Garmin use a barometric pressure sensor to determine elevation. The Garmin also uses GPS as part of the calculation to negate the effects of weather. Weather can affect barometric pressure and how the Joule computes elevation. Cloudy days are typically low pressure and will create an artificially high elevation. Bright sunny days are typically high pressure and will create an artificially low elevation.
Why don't I see my current ride in the history files?
You need to stop and save the ride before the history file is created.
Note that the "end ride time" can be set to 90, 60, 30, 15 min or "never." Default is "never."
Why is the "feet gained" different than a Garmin?
The Garmin uses a different altitude value based on both barometric pressure and GPS while the Joule uses just barometric pressure. Additionally, the Garmin and Joule use different averaging routines to calculate feet gained and lost.
Temperature seems off on short rides.
The temperature sensor is embedded in the packaging and takes some time (30 min) to equilibrate. Short rides or quick temperature spikes may not register with the Joule.
Additionally, there is some self-heating from the electronics of when placed in direct sunlight.
How is it any different (why is it better) than a Heart Rate Monitor?
- First, it introduces the relationship of a dose vs. training.
- The PowerCal contains an algorithm that is sensitive to acute changes in Heart Rate (HR) and can account for rapid changes in power output.
- It translates conversations into the vernacular of power training: watts, kilojoules, peak power, FTP, etc.
- Current power meter users can now have uninterrupted training load data for activities where power meter data may be unavailable, like commuting or MTB riding.
Why does it no longer have to be calibrated?
After years of research and reevaluation of the algorithm it was determined that the calibration process added no more accuracy than the algorithm alone. Due to the variability of heart rate, both between and among individuals, calibration did not statistically increase accuracy of translated energy expenditure. Some individuals may see improved accuracy through calibration but, as a whole, the results show the algorithm alone is able to translate heart rate to power as well as individual calibration.
How accurate is it?
The PowerCal is not as accurate as a PowerTap and not intended to replace one. Research has shown varying degrees of accuracy based on individuals and types of riding. Accuracy will depend greatly on the individual and type of riding.
How does it compare to PowerTap?
It doesn’t and isn’t intended to. The PowerTap directly measures power through strain gauges on the torque tube, which is a direct measurement of power. PowerCal is an estimated value derived from HR.
How, after all these years of saying HR alone is not the best measurement for training, can you now measure power from HR?
There has always been a correlation between HR and power, it’s just that it varies depending on conditions. We’ve simply designed algorithms which predict power based on HR.
Will PowerCal give you both HR and power readings?
How does it estimate KJ’s burned: from HR or from estimated power?
How does it accommodate changes in fitness, fatigue, dehydration, etc. (all the things which influence HR)?
In terms of changing fitness with a given individual our initial assumption was that yes, as fitness increased the user would need to re-calibrate to properly adjust the system but what the research shows is that these changes are relatively very small compared to other factors at play when using heart rate as the base measurement. In other words, the margin of error when using heart rate as the sole measure of exercise intensity is too great to accurately represent changes in fitness.
In discussions of PowerCal as it relates to fitness, fatigue, dehydration, etc. one can look at the power output relative to other metrics such as speed over the same course or changes in cadence over time. Power output as a performance metric is almost always spoken of in terms of how it relates to the other variables to gain insight to the individual’s progress.
Is it more accurate for certain types of riding (steady-state intervals, climbing, sprinting, etc.)?
PowerCal is more predictable in a steady-state, longer intervals or climbing where constant fluctuations in output are minimized.
Why does the power reading jump around so much?
This is a question we get with new PowerTap users as well. The answer is the products are able to measure very small changes. In the case of the PowerTap (hub) it can measure changes in torque and velocity very rapidly. Even experienced cyclists do not have ability to put the exact same force with each leg on every pedal stroke- the result is a power reading that jumps around a lot. As cyclists improve their pedaling smoothness the power numbers fluctuate less, but the fluctuations will always exist.
For PowerCal the situation is very similar- your HR is constantly changing even though your BPM does not reflect these changes. The PowerCal picks up on even the most minute change in the time between heart beats and the result is a spike in power from a rapid change in HR, much like the PowerTap shows a rapid change in torque or velocity. The PowerCal’s ability to measure and quantify these changes is what makes it such a great product and gives the user a much better experience and a more accurate measure of total work than HR alone.