• Thread mount design is light, stiff and accurate, and available in 38T-46T
• User replaceable CR2032 battery with 200-hour battery life
• Bluetooth low energy technology and ANT+ wireless data transfer
• MagicZero automatically checks and recalibrates your power meter as you ride
• No cadence magnet required
• AXS™ enabled for easy monitoring and firmware upgrades
• SRAM Model ID: PM-AXS-SPDR-E1