Home Page


When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.
Expert Help

Up To 60% Off

Winter Clearance Sale Shop Now

Shimano Ultegra R8000 Precision Left-Side Power Meter

Be the first to review

Out of Stock

Don't worry though, we have a lot more Gravel & Cyclocross Cranksets & Chainrings in stock than that.

Shop Similar Products

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