Sorry, this product is no longer available!
4iiii Precision Ultegra R8000 Left Arm Powermeter is no longer available at Merlin Cycles. However you may find an alternative or updated product below.
4iiii Precision Ultegra R8000 Left Arm Powermeter
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4iiii Precision Ultegra R8000 Left Arm Powermeter

This item was discontinued 18th April 2023.

If you require help finding an alternative to this product please contact customer services.

Code:: PML100-S10
4iiii Precision Ultegra R8000 Left Arm Powermeter
Accurate measurement of cycling effort is vital for anyone who takes cycling seriously. PRECISION powermeters provide industry leading accuracy, together with reliable cadence data. PRECISION 3D technology is capable of measuring tri-axial strain on the crank arm, ensuring the accuracy of the measurement. Designed to work flawlessly with Bluetooth and Ant+ head units, PRECISION powermeters offer an accurate, lightweight, durable and affordable method of measuring rider power.    
PRECISION power meters are installed on a new Shimano left crank arm (105, Ultegra, or Dura-Ace). These crank arms will fit bottom brackets using the Hollowtech ii format.
  • 3D powermeter technology (patent pending) measures tri-axial strain on your crank arm
  • Accurate, consistent data
  • Lightweight, compact design
  • Battery status indicator via 4iiii app
  • Compatible with ANT+, Bluetooth Smart head units, smartphones, and other 4iiii products
  • User-friendly app and configurable rider compensation scale factor
  • Easy setup and maintenance
  • Weight: 9 grams
  • Data accuracy: +/- 1% error margin
  • Battery life: 100+ riding hours on 2032 coin cell battery
Note: Check your frame clearance before you order by downloading and printing the compatibility guide Click Here
Mr Nam-ay very good
richard Finally dipped my toe into the Powermeter market and to say I’m impressed is an understatement, so easy to set and use just wished I’d got one soonerz
Mr Wheeler I've got a couple sets of Garmin Vector power meters on other bikes, but I got tired of dealing with those small LR44 batteries and the metal end cap screwing into a plastic housing. So I bought this power meter and paired it with some standard Look pedals. The CR20 battery is much easier to deal with, and the battery compartment is easier too. The accuracy and reliability are good. I'm very happy with this decision.
Graham M Power meter connected to Gamin 510 first time, and also to smart phone app (updates installed) first. The power readings compare to those seen on a watt bike Atom, so all seems good. Used in some wet Uk weather and no issues seen. All good so far.
Mr Jacobs Phenomenal performance, best value for money power meter on the market!
Mr Werberich Plug and play crank arm, looks exactly as the one it replaced. The gap to the frame is perfect on a Scott foil.
Richard I've had the 105 version for a year, bought this one for a new bike. Functionally the Ultegra is identical. The only problems I've found over 1000's of km's is an occasional failure to reconnect after a coffee stop on a club run and a tendancy for the battery terminal to flatten out and cut out the unit. These two issues might be connected. The battery issue is easily fixed by pulling the terminal up witha slim blade. No problems with water getting in, I take no precautions washing down, it gets hit with detergent, water and degreaser regularly and has no problems. Paired with an Elemnt you get a battery warning when its low which is useful. The odd glitch wasn't enough of an issue to stop me buying a second.