Stages Cycling is known for their left side crank arm power meters. In fact, they were the first company to make a left side crank arm power meter (started in 2012). They are now on the 3rd generation of Stages power meters. They currently make left and ride side crank arms as well as dual-sided cranksets. Stages power meters are lightweight, feature 200 hours of battery life and are compatible with Shimano, Campagnolo, FSA, Cannondale, SRAM and Race Face cranksets.
Installation of Stages left crank arms simply involves removing your current crank arm and installing the Stages in its place. Total installation time is usually less than 5 minutes.
Complete Stages cranksets take a bit more work as you have to swap out your entire crankset. However assuming you have insured compatibility with your bike frame – it’s pretty simple.
Stages power meters are one of the lightest available. The sensors add just 20 grams of weight to the crank arm, the equivalent of about 20 paperclips. If you opt for a dual-sided crankset, you would be adding about 40 grams, as these units have a power sensor on both the left and right crank arms.
Stages left side only crank arms measure left leg power and double the value to calculate total power. This is how all single-sided power meters work. Assuming you do not have a large leg imbalance (in terms of power), this is an accurate way to measure power.
Complete Stages cranksets such as the Shimano Ultegra R8000 and DURA-ACE 9100, measure power from both legs. They are also able to determine independent left/right power.
One of the great things about Stages power meters is their broad selection. They make a left side crank arm for almost any crankset. In addition, with models starting at $299, they are one of the most affordable, ready to ride direct force power meters available. They are also extremely lightweight. These power meters only add about 20 grams of weight to your crankset.
Stages power meters use CR2032 batteries. CR2032 batteries are cheap and easy to find. Battery life is approximately 200 hours, quite good for a battery of this type.
These power meters transmit data via both the ANT+ and Bluetooth SMART wireless protocols. This means they are compatible with any bicycle computer, smart phone or tablet. It also means they can be easily connected with popular training apps such as Zwift.
All Stages power meters are accurate to within +/- 1.5%. This is in-line with most power meters on the market.
Cadence is measured using an accelerometer. An accelerometer is an electronic device that is housed inside the power sensor and measures your pedaling rate.
Stages offers a one-year warranty which covers the product from defects in material and workmanship. We note their warranty support is quite good should you have any issues with your power meter.