This unit comes pre-installed on a Shimano Ultegra 6800 left hand crank
Click here for The 4iiii Manual.
Improved Battery Life
Extend your battery life up 100 hours with the latest Firmware upgrade. We’ve also made improvements that make allowance for general sensor vibration so you no longer have to remove your battery when transporting your bike.
Now you will be able to see how much battery life you have left when you’re out on a ride. This battery alert will be transmitted to the 4iiii app as well as any ANT+ head unit paired with the PRECISION power meter. The percentage of remaining battery will tick down according to your sensor use. When your battery status shows as “low” status, you have about 20 more hours before it’s time to finish your ride and change out the 2032 battery coin. For best results, use one battery until it reaches the ‘low’ mark and then replace with a new battery.
Adjustment Scale Factor
PRECISION’s new advanced settings allow you to adjust PRECISION’s output to account for a leg strength imbalance. It will also let you match PRECISION’s output to that of another power meter. This feature was introduced to address the fact that PRECISION is (currently) a left-only power meter, and not everybody has a 50/50 left-right balance. Perhaps from training on some different equipment, you know that your left leg is actually weaker and you have a 45/55 left-right balance. Doubling the power from your left leg (as per PRECISION and all single sided power meters), gives you a total power of only 90% of what you’re actually putting out. In order to adjust for this, you can simply set the scale factor to 50/45=1.11111. 50 because 50% is your desired reading for PRECISION (half of your total power output), and 45 because your left leg is actually only putting out 45% of your actual total power. This scale factor can also be used to match PRECISION’s output to other training equipment you use.
Improvements to Zero Offset
These changes allow for robust and reliable handling of calibration values, providing accurate reading (+/- 1%).
PRECISION’s seamless connection to Sportiiiii and ANT+ compatible displays (watches, bike computers, etc.) lets you work with your choice of top devices from leading global brands.
4iiii Product Integration
Let all your 4iiii products help you optimize your performance. Use your PRECISION power meter with your 4iiii Sportiiii heads-up performance coach, which gives real-time visual and audio coaching cues. Wear your Viiiiva heart rate monitor along with PRECISION for ultra-responsive beat-to-beat measurements that can help you adjust your performance.
iOS: This product is designed for use on the iPhone 4s and newer, iPad 3rd gen and newer, iPad mini, iPad Air, and iPod 5th gen.
Android: This product is designed for use with Android devices compliant with the Bluetooth 4.0 protocol running Android version 4.3 or newer and must allow Third Party App Access to the Bluetooth 4.0 (Smart) Radio.
User-friendly 4iiii app
View your activity in real-time, upgrade to our latest product features and access the 4iiii web store with the 4iiii app. It’s compatible with both iOS and Android and is your gateway to emailing your stored activity logs to your favourite third-party training app or site.
Apps and Software
Download the 4iiii app from Google Play and Apple iOS app store
PRECISION Firmware 0.3.0 Upgrade Instructions
Click here for Android instructions.
Requires iOS 7.1 or later. Compatible with iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPad Wi-Fi (3rd generation), iPad Wi-Fi + Cellular (3rd generation), iPad Wi-Fi (4th generation), iPad Wi-Fi + Cellular (4th generation), iPad mini Wi-Fi, iPad mini Wi-Fi + Cellular, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, iPad mini 3 Wi-Fi + Cellular, iPad mini 4, iPad mini 4 Wi-Fi + Cellular, iPad Pro, iPad Pro Wi-Fi + Cellular, and iPod touch.
Requires Android 4.3 or better, and Bluetooth 4.0 support on the phone. We have seen better BLE stability with Android 4.4 and Google Nexus devices. We have tested with Nexus 5, Samsung Galaxy S4, Note 3, and Note Pro (tablet). Older phones have been less stable, especially for firmware updates.
If ordered before 9pm, delivered by courier next working day. Available on orders placed before 9pm (2pm weekends and Bank Holidays) for delivery next business day. Applies to most delivery addresses within mainland UK.
Please remember to add postal time (2-3 working days) to obtain a complete estimate of delivery to your door.
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 My Account details and following the prompts.
Please allow 10 working days from dispatch of your order before notifying us of any late deliveries.
It may be advisable to check with your neighbours to see if a parcel has been left with them, check any outhouses you might have where it may be left if it cannot fit through your letterbox and contact your local sorting office to see if the item has been returned to the depot as undelivered and awaiting collection.
Please see our returns policy.
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.
Write a review to be in with a chance of winning a £100 voucher to spend on ProBikeKit.
As is similar to most people who have reviewed these PM's I have been considering a crank based PM for a while. More than likely spent far too much time researching on the internet than is healthy! Anyway took the leap with this, and I am very happy with my purchase so far. I contacted PBK to ask if it would fit my bike after it failed the 'fit test'. They were not sure, and 4iiii disnt seem to think it would. Took a gamble, and it fits my giant advanced sl 2016, result. I have emailed 4iiii as a result to question the test! The PBK staff were very helpful (mainly Peter) and said I could return it if no joy. So after 2 weeks it has been easy to set up, easy to use and provides regular power measures. I am not sure how accurate vs other as I have no experience with them. I think this is great value vs another crank PM, but again no experience and its early days yet so lets see if it continues. The app set is easy to use, only downside is you have to zero each time you go for a ride, but at least you know its right and it takes 2 mins. I can swap between my 2 bikes easily too. So overall, would I recommend, definitely so far yes I would, but I have only had it for 2 weeks so there is no long term usage, reliability info I can give. Fingers crossed it continues, as it is really helping structure my training and ride efforts better through my 520 garmin.
This was the best value power meter I could find. Easy to install on my existing Shimano setup. Can keep my existing pedals that I like. Having the numbers from the meter I can now really focus my training and see if my FTP is improving as a result. Would be 5* but the rubber o-ring on the battery compartment was missing. I have contact the 4iiii support who are being a bit slow in sorting it out. So it is only suitable for going out in the dry at the moment. You get a spare battery which is a nice touch and really easy to swap when the time comes. So overall I am happy with my purchase and feel I made the right choice.
One year ago I wanted to acquire Stages power meter. But price was too high for me. And I was waiting for something cheaper, but with high quality and precision. 4iii Precision 2.0 3D power meter matched all my requirements in theory, and now in practice. I'm very satisfied with this product. Sometimes long waiting rewards!
I bought this to help me train over the winter ready for next season's TTs, and to help me dose my effort better. I wanted a left hand crank as I wanted to transfer across bikes - onto the TT bike in races, the summer bike for training, the commuter and turbo in the winter. Pedals are too expensive for me, and this is the cheapest of the crank options (and well reviewed by DC rainmaker). You can never tell how accurate the meter is (unless you calibrate it yourself against another perfect meter) but DC rainmaker seems to think it is no better and no worse than any other. The main criterion for me was ease of transfer from one bike to another, and it is dead easy - release the two bolts, unscrew the tension cap and it comes straight off. No more than 10 minutes tops to move from one bike to another. Pleased with this purchase so far.
Great tool for everyone that wants to measure up efforts. Easy setup and integration with strava.
Well - what can I say, I bought this as a second meter, having already fitted a Stages single sided crank to my "main" roadbike... Of course, when you get used to riding with a power display, and use it for pacing, training etc. it's annoying to either have to keep swapping the cranks to the 'cross bike or riding without the information. So, I decided I wanted a second meter. And, having already had "issues" with water ingress on the Stages (that necessitated a replacment - though this was before the "new" mk2 enclosures - so i've still got one of the old square Stages units with the fragile battery door) I decided to try a different supplier - the 4iiii fitted the bill - cheaper than the Stages, and a friend had been running one of their cranks for a full Welsh Winter without it blowing up, so I thought "go for it" I've only had the unit a couple of weeks, but so far it's been fine - the power readings have been "sensible" compared to what I'd expect with the Stages - it's not had any wierd "spikes" in the readings, and of course, it went onto the bike simply and without any drama. I'll probably drop back in here and add a second review in a few months, as I'm borrowing a pair of powertap pedals for a couple of weeks while a friend is on family holday, which I'm hoping to use to a) see that the power readings compare directly between the 4iiii and the Stages and b) see if I have any major imbalance from Left/Right that the 4iiii can be used to compensate with - if that's the case, I'll probably sell the Stages on and get a second 4iiii unit...