PowerMeter

Where does the cadence magnet need to be positioned?

  •  The PowerMeter will not transmit data to your display unit without the cadence magnet or wiring harness being properly installed underneath your bottom bracket or on the chain-stay of your frame.
  • Refer to page 4 of our manual for specific instructions.

 

 

My power and cadence readings are zero, erratic, or not accurate?

  • The cadence magnet is not in the correct position over the reed switch.
  • The slope is not entered into your display unit correctly or your PowerMeter is not transmitting the correct slope to your display unit.
  • The zero offset needs to be set.
  • The battery is almost empty or there is damage to the PowerMeter circuit board.

My zero offset is too low (below 200Hz), too high (above 900Hz), or reading Zero. What is the cause?

  • Your PowerMeter may have sustained damaged that is beyond the scope of troubleshooting.  
  • Your PowerMeter battery is low/nearly depleted.
  • Its advised you contact your local SRM Service location for a more detailed diagnosis of your technical problem. 

 

 

Can I upgrade my wired SRM to a wireless SRM?

Only under special circumstances. Please call the SRM Service Center for specifics. 

Can I physically open my PowerMeter?

We don’t recommend it because all warranty will be voided and you will be responsible for all repair costs. 

What is "zero offset"?

The zero offset is the frequency in Hertz that the PowerMeter is transmitting when no torque is applied. Once torque is applied, the zero offset will rise. It is important to set your zero offset at the beginning of a ride to ensure that your PowerMeter is tared. 

What is "slope"?

Each PowerMeter has a unique “slope” value, which is calculated during the calibration of that specific PowerMeter. The unit used to describe slope is 'Hz/Nm.' For example, 20.0 Hz/Nm means that for each Newton Meter of torque applied to the PowerMeter, the output frequency will increase by 20 Hertz. 

Can I change chainrings without affecting the slope of my PowerMeter?

  • Yes, with the exception of solid TT rings. If you are changing to or from a solid TT ring, it is recommended that you have your PowerMeter re-calibrated.
  • Do not over-tighten chainring bolts. Please follow the correct torque specifications.

 

 

Can I change the drive-side crank arm without affecting the slope of my PowerMeter?

Depending on your PowerMeter….

Why is it important to have my PowerMeter calibrated at the SRM Service Center?

Calibrations done at the SRM Service Centers are the most accurate. We calibrate in a controlled environment using a known force and a calibration jig. This known force is hung from the chainring thus eliminating the friction from the bottom bracket and ensuring the most accurate slope. 

Can I calibrate the slope of my PowerMeter on my own?

Yes, if you have the right equipment and calculations. This requires hanging a known force from the crank arm, pedal, or chainring. In order to ensure the most accurate calibration, you must eliminate the friction of the bottom bracket by hanging a known force from the chainrings. 

back to top