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The spider-based power meters attach to AXS cranksets using a simple 8-bolt interface. To install one, remove your driveside crank arm using a hex wrench long enough to apply the 54 Nm of force required to back out the fixing bolt. Then remove the eight Torx T20 bolts that attach the crank spider or chainring assembly to the crank. If applicable, we recommend removing the chainrings using a Torx T30 wrench before removing the eight spider fixing bolts.
Log in to the SRAM AXS App and add your power meter to your bike profile. Check your power meter’s firmware to make sure it’s up to date.
Spider-based power meters use Magic Zero technology to automatically calibrate the power meter for you, so you never need to worry about calibration! MagicZero works by continuously monitoring the torque signals from the strain gages as you ride, so you can focus on the road ahead.
Get the most out of your power meter by pairing it with a cycling computer to understand your efforts in real-time and save the data to track your progress. With a Hammerhead Karoo, pairing is automatic when you sign in using your SRAM account. For other bike computers, consult your manual for pairing instructions.
You’ll get approximately 200 ride hours of battery life from a single CR2032 coin cell battery. To check the status, watch the LED on the crank spider while waking your power meter with a half-turn backpedal. If the LED flashes red, it’s time to change the battery. You can also view battery status in the AXS App and on your Hammerhead Karoo or ANT+ bike computer.
The spindle-based power meters are integrated into the DUB spindle, so upgrading is easy. To swap out your non-drive side crank arm to an AXS power meter upgrade, turn the 8mm hex bolt on the drive side arm counterclockwise until the drive side arm comes off, then pull the non-drive side arm and spindle out of the bike. Pick up your new AXS power meter upgrade arm and spindle, grease the spindle, and slide it into the BB. Then install your drive side crankarm by torquing it to 54 Nm and set your preload.
Log in to the SRAM AXS App and add your power meter to your bike profile. Check your power meter’s firmware to make sure it’s up to date. You can also double-check your battery status while you’re here.
Perform the Manual Zero calibration process in the AXS App. For the best accuracy, repeat the Manual Zero process before each ride. You can also use your bike computer to quickly complete the process once it’s connected to your power meter.
Get the most out of your power meter by pairing it with a cycling computer to understand your efforts in real-time and save the data to track your progress. With a Hammerhead Karoo, pairing is automatic. For other bike computers, consult your manual for pairing instructions.
With a replaceable lithium AAA battery inside the spindle, you'll ride worry-free with 400+ ride hours of battery life. To check the status, watch the LED on the non-drive side spindle while waking your power meter with a half-turn backpedal. If the LED flashes red, it’s time to change the battery. You can also view battery status in the AXS App and on your bike computer.
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