XDS X-LAB GT8 Power Meter Spider Train With Both Numbers, Not Just One Spider-based power measurement is the most reliable position on the drivetrain. The Branta alloy crankset on the GT8 puts the strain gauges at the chainring spider, where total force from both legs combines before any drivetrain loss. That placement gives you clean, repeatable data ride after ride. The meter transmits via ANT+ to any compatible head unit, so it pairs with the Garmin, Wahoo, or Hammerhead already on your bar. Left/right balance is reported as standard, giving you the full picture of how each leg contributes across long climbs or hard intervals. Apple Find My technology is integrated directly into the crank body, a practical addition for bikes left in transition areas or shuttle vehicles. Spider-based dual-sided measurement captures total power from both legs at the chainring, reporting left/right balance without a separate sensor pod Claimed 1. 0% accuracy matches the spec you see from established spider-based meters, giving training and race-day data you can trust ANT+ transmission pairs with virtually every major head unit out of the box; Bluetooth connects to the X-LAB Bikes app for calibration, battery status, and firmware updates150-hour rechargeable battery covers months of riding between charges, no coin-cell hunting required IPX7 waterproofing keeps the electronics protected through rain, river crossings, and post-ride hose-downs Apple Find My integration is built into the crank body, adding a layer of security without an external tracker or adhesive mount | Xds | X-Lab Gt8 Power Meter Spider 40T Chainring And Spider One-Piece | Alloy | Gt8 | Aluminum