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4iiii Precision 2.0 Power Meter - Dura Ace R9100


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Average connection time 25 secs

Average connection time 25 secs

Whether you’re a pro or simply training hard, PRECISION powermeters deliver industry-leading accuracy, highly dependable cadence data, 3D powermeter technology capable of measuring tri-axial strain on your crank arm. Designed to be durable and lightweight, compatible with ANT+ and Bluetooth head units, PRECISION helps you train harder and smarter.

PRECISION Ride Ready comes installed on a new Shimano left crank arm (105, Ultegra, or Dura-Ace). These crank arms will fit bottom brackets using the Hollowtech ii interface.

NOTE: check your frame clearance before ordering by downloading and printing the compatibility guide:


  • 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
  • Precision 2.0
  • Road
  • Shimano
  • 4iiii

How long will it take to arrive?

Please check the stock availability notice on your item when placing your order. This item is:

How will I know it has been sent

You will receive an email to confirm when your item has been sent.

You can also check the status of your order and individual items by accessing your account details and following the prompts.

Please allow 10 working days from the shipping date of your order before notifying us of any late deliveries.

It may be advisable to check with your neighbors to see if your delivery has been left with them, check any places it could be left such as: garage, porch, or behind garbage cans if it was too big to fit through your mailbox. Contact your local post office to see if the item has been returned to the depot as undelivered and awaiting collection.

If I'm not completely happy with my item?

Please see our returns policy.

Customer Reviews

Overall Rating : 4.0 / 5 (4 Reviews)
  • 3 5 star reviews
  • 0 4 star reviews
  • 0 3 star reviews
  • 0 2 star reviews
  • 1 1 star reviews

Top Customer Reviews

Where reviews refer to foods or cosmetic products, results may vary from person to person. Customer reviews are independent and do not represent the views of The Hut Group.

Great so far..!

I've had a few power meters before (Garmin V1, V2, V3, Stages Ultegra, Specialized Ultegra crank, Rotor 2InPower) and so far the 4iii is up there at the top. It's easy to install, easy to configure, easy to change the battery, easy to connect to my head unit and other devices, easy to upgrade firmware.... and the power readings seemed instantly consistent and reliable and very comparable to the Rotor (which is dual sided). My L/R balance is about 49/51 on average so I have no issue with this power meter being single-sided. Very happy customer so far. I would recommend it!


Very pleased with this power meter. Very consistent and reliable so far. No power spikes or dropped connections. Performs exactly as expected.

4iii power meter

Purchased a one sided 4iii power meter. It is the most inaccurate meter i have ever had. Reads about 40w lower than my other meters. Very disappointed.

Pretty good

Power meter works real well no problems except if you have left right imbalance