There are several power meters that will work on an Easton EC90 SL or Easton EA90 crankset:
Left Crank Arm Power Meter
Stages Cycling makes a left side crank arm for Easton road CINCH cranksets. This power meter will replace your current left side crank arm and will measure left leg power. Please note you must also purchase a Stages C Spindle along with the power meter.
Please note, these power meters attach a sensor to the inside of the left crank arm. On some bikes, there is not enough room between the left crank arm and the chainstay for the sensor to clear the frame. Therefore, you should make sure you have at least 10 mm of clearance for Stages power meters. Also, please make sure that you don’t have a bottom bracket mounted rear brake (used on some aero and TT bikes). Please refer to the image below.
Pros: Affordable, easy to install, don’t have to change crankset
Cons: Measures left leg power only
Spider Power Meters
The power2max NGeco Easton Road Power Meter is our go to power meter for Easton road cranksets. It’s a superb power meter in that it’s accurate, extremely durable, measures the power from both legs, is reasonably priced and allows you to keep your current Easton crankset.
The power2max NGeco Easton Road Power Meter is compatible with the Easton EA90 aluminum or Easton EC90 SL carbon crankset.
Pros: Moderately priced, VERY reliable, don’t have to change crankset, measures both legs
Power Meter Pedals
Power meter pedals can be installed on any crankset. This is a very popular power meter type as they fit any bike, are easy to install and can be moved from bike to bike if necessary. We carry power meter pedals from Favero, Garmin, SRM/LOOK and Wahoo. This includes pedals for SPD-SL, LOOK Keo as well as Speedplay cleats.
Pros: Easy to install, works on any bike, can move from bike to bike, don’t have to change crankset