This page contains our spider power meters for road bikes. These power meters measure power at the crank spider (hence the name). You typically keep your existing crank arms and replace your spider or chainring with the power meter (however in certain situations, you replace the crank arms as well). These power meters are very popular. They measure power from both legs, are relatively affordable, are accurate and reliable. In addition, there are models to fit almost any crankset.
Additional Spider Power Meters for Road Info:
We carry spider power meters from power2max, ROTOR, SRAM and Quarq.
Quick Product Comparison:
Pricing on these power meters is similar with most units falling in the $500-$700 range. However power2max’s NG power meters sell for closer to $900-$1,000.
These companies make a similar product at a similar price point. The brand that you go with is largely dependent upon your crankset as compatibility varies across the brands.
power2max makes power meter spiders for virtually every crankset including SRAM, Praxis, ROTOR, Specialized, Easton and Cannondale. So if you have any of those, a power2max can be a great fit.
ROTOR makes the INspider power meter which is compatible with ROTOR cranksets such as the ALDHU and VEGAST.
SRAM and Quarq road power meter spiders are intended for use with Quarq and SRAM 8-bolt DUB and GXP cranksets. This includes SRAM RED, SRAM Force and Quarq DZero cranks.
With a spider-based power meter, you remove your crankset from the bike, replace your existing spider or chainring with the power meter, attach a chainring to the power meter and then reinstall the crankset. Installation isn’t as easy as say a left crank arm or pedal, but assuming you are not making a change to the bottom bracket, it can usually be done at home with some basic tools. Typical installation time is usually around 30 to 60 minutes.
All these power meters measure power from both legs. They are also able to display left and right power balance data.
These power meters are dual ANT+ and Bluetooth SMART compatible.
The battery type varies across the different models. The power2max NGeco uses a CR2450 battery, while the Quarq uses a CR2032 battery. The power2max NG and ROTOR use a rechargeable battery.
Most of these power meters weigh between 130 and 170 grams. This is slightly heavier than a standard spider as the power meter spider contains electronics and a battery, but the added weight isn’t typically more than about 50-75 grams.