SRM Power Meters

Additional SRM Power Meter Info:

Installation

SRM power meters typically come as a complete crankset – spider, chainrings and crank arms. Installation requires you to remove your existing crankset and replace it with the SRM. Assuming you are not changing bottom brackets, this is a pretty straightforward process, but is more involved than say installing a pedal or crank arm.

Their pedal power meters are a bit easier to install. While there are some quick one-time set-up steps, they largely install like a normal set of pedals

Weight

Most SRMs run in the 600-800 gram range, with the SRM Origin weighing in at 599 grams, the lightest of the bunch. Remember, when buying a power meter, you are concerned about added weight. Therefore, determine added weight by subtracting the weight of your current crankset.

SRM power meter pedals are designed to be lightweight and weigh similar to a set of regular road pedals.

Power Measurement

SRM cranksets measure power at the crank spider. Therefore, they measure both left and right leg power. In addition, like some other crankset-based power meters, they are also able to measure left/right power (power balance).

SRM pedals have a sensor in each pedal and therefore can measure the power from both legs in addition to independent left/right power.

Special Features

What sets the SRM apart is its accuracy. They have been making power meters longer than anyone and have the process down to a science. Most units feature SRM’s 144 point calibration protocol, resulting in accuracy up to +/- 1.0%.

Batteries

Most SRM spider-based power meters use a rechargeable battery with 100 hour battery life. Their pedal power meters use a rechargeable battery with 30 hours of battery life.

Communication Protocol

SRM power meters support both the ANT+ and Bluetooth wireless protocols. Therefore, they are compatible with any head unit (including SRM’s own PowerControl head units), as well as phones, tablets and indoor training apps.

Accuracy

Accuracy is synonymous with SRM. The company uses a 144 point calibration protocol against a known mass measured to the exact gram. Many of their power meters have an error of less than 1.0% in most cases, better than the industry standard.

Cadence Detection

SRM spider-based power meters use an accelerometer to measure cadence. This just means that the electronics inside the power meter are able to determine your rotational rate. This is how all crankset power meters measure cadence.

SRM X-Power Road power meters use a magnet to measure cadence.

Warranty

These power meters come with a two-year warranty which covers the product from defects in material and workmanship.