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Shimano Ultegra R8000 Precision Left-Side Power Meter

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Why We Like The Shimano Ultegra R8000 Precision Left-Side Power Meter

When we hop into the saddle to train, we use the R800 Precision Power Meter to make the most of real-time ride data to optimize our training efforts. This crank arm uses a 4iii power meter pod affixed to the side of the arm, which takes what was originally a standard Ultegra R8000 crank arm to the next level with readings accurate to +/−1.0%. The coin cell battery offers 100 hours of life, giving you plenty of time to gather and scrutinize data for rides to come before a recharge is required. When the time comes to look over the facts and figures, simply connect the Precision to the 4iii app on your phone via ANT+ or Bluetooth SMART for information at your fingertips.


  • Left side crank arm with built-in power meter
  • +/- 1.0% accuracy provides near-perfect training data
  • Accelerometer with gyroscope offers cadence readings
  • Only 9g heavier than a standard crank arm
  • 100 hours of battery life via replaceable CR2032 battery
  • Pair to the 4iii app with ANT+ and Bluetooth
  • Item #FII0003
Hollowtech II
Dual-Channel ANT+, Bluetooth Smart,
Accuracy (+/-)
standard CR2032 coin cell battery
Operating Time
100+ hours
Claimed Weight
0.3oz (9g)
Manufacturer Warranty
3 years
road cycling
1 sticker