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4iiii Precision 3 Ultegra R8100 Single Leg Power Meter
4iiii Precision 3 Ultegra R8100 Single Leg Power Meter
4iiii Precision 3 Ultegra R8100 Single Leg Power Meter
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4iiii Precision 3 Ultegra R8100 Single Leg Power Meter
4iiii Precision 3 Ultegra R8100 Single Leg Power Meter
4iiii Precision 3 Ultegra R8100 Single Leg Power Meter

4iiii Precision 3 Ultegra R8100 Single Leg Power Meter

Mfg PartNum:
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Backorder: This item is currently not in stock but is available to purchase today as a backorder. The expected availability date shown above is our best estimate as to when it will be shipped to you, but this date is subject to change based on our receipt of this item from its vendor. Shipping in the continental US is free for all backorder items (for international orders, our customer service team will contact you when the item is available to ship). Your credit card will not be charged until your item ships (Paypal requires payment up front, but you can cancel for full refund). Anytime prior to shipment, your backorder can be cancelled by contacting our customer service team.

Success Takes Time

With up to 800 hours of battery life, +/-1% accuracy and backed by their legendary 3-year warranty, the 4iiii PRECISION 3 Ultegra Powermeter will be your trusted training tool for years to come.

A Ride Ready PRECISION includes and comes preinstalled on a brand-new Shimano crank arm in one of four sizes that will fit bottom brackets using the Hollowtech II interface. Connect a head unit or computer, and you can start riding with power!

Ridden through rain storms at Strade Bianche, mud filled cross country mountain bike races, and even tested amidst the salt spray of the ocean on Oracle Team USA's America's Cup competitors, you can be assured that your 4iiii Powermeter will be as tough as you are and is backed with an industry leading 3-year warranty. All 4iiii Powermeters are IPX7-rated for water immersion up to one meter.

The 4iiii PRECISION 3 powermeter can be used with all popular indoor-training apps, such as Zwift, TrainerRoad, Wahoo SYSTM, Rouvy, and more. Simply use your favorite app's connection procedure over ANT+ or Bluetooth Smart, put your bike on a trainer, and get riding!


  • Ultegra R8100 crank left leg in 165, 170, 172.5, or 175mm
  • Measures cadences of 30-170 RPM and power from 0-4,000 W +/- 1%
  • CR2032 coin cell battery with up to 800 hours of life
  • ANT+ and Bluetooth compatible
  • IPX7-rated waterproof
  • Operates between 0-50 °C (32-122 ° F)
  • Weight: 9g (Not including crank arm)
  • 3-Year Warranty

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

165mm - Left Leg

Mfg PartNum: PML300-S18A00J 

170mm - Left Leg

Mfg PartNum: PML300-S18B00J 

172.5mm - Left Leg

Mfg PartNum: PML300-S18C00J 

175mm - Left Leg

Mfg PartNum: PML300-S18D00J 

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*Orders received before 3:00PM Pacific time are shipped the same day (Mon-Fri). Orders over $50
are shipped free (USA only, excluding AK and HI). Some exceptions apply. See Shipping for details. 83


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