4iiii Precision 2.0 3D Power Meter – 105 R7000 – $364.99 Delivered (RRP $545.99) @ ProBikeKit


Improve training performance with a 4iiii Precision 2.0 3D 105 R7000 Power Meter. By employing 3D power meter technology and a triaxle strain gauge on the crank arm, this 4iiii power meter measures the amount of power you're putting through the pedals to +/-1% accuracy, so you can ride harder, faster and further.

Requires some tools to install the crank arm. Make sure you purchase the right length so it matches your existing right side crank arm.

Available in all lengths at time of listing.

Link to other 4iiii products including Ultegra and Dura Ace options: https://www.probikekit.com.au/elysium.search?search=4iiii

Terms of the coupon (sitewide):
$10 off $100 or more
$20 off $180 or more
$45 off $350 or more

I own one of these and I love it. I use it with https://intervals.icu which is a free website that uses your power data to generate some beautiful graphs and helps with planning your training. Battery life on these units is very good, I have ridden about 5000 km since buying one of these and have only changed the battery once.

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  • "By employing 3D power meter technology"

    What an absolute load of drivel!

    Does it invoke the power of the pyramid, magnets and crystals as well?

    Not commenting on the product, because strain gauges can obviously be used to infer force as long as you know the shape and dimensions of your beam and its Youngs modulus. But the description is just terrible!

    • My current meter only uses 1D power meter technology so this looks like a great upgrade!!

    • You new to marketing or something?

    • It's utilising triaxial (ie 3 dimensional) strain gauging and calculation to determine power. The earliest crank arms used single strain guages and had probably massive error margins.
      So its pretty accurate and equally pretty tame in terms of marketing for psuedo-scientific devices to the mass market.

      • It's common to apply triaxial strain gauges (rosettes) on a two dimensional surface to be able to calculate the normal and shear strain components.

    • I think having multiple strain gauges would be beneficial. Otherwise you can't tell forward force from downwards etc. I agree the marketing is a bit OTT though

    • Strain gauges with a wheatstone bridge are getting more and more accurate and cheaper.

      I would like to get one of these but I'm thinking it's only a matter of time for the usually suspects in China to knock one up for sub $100. Then I'll give it a go

  • I would love to use this to measure the power of my bike that has been stuck in the garage for one year.

    • You should try Zwift (or something similar).

      Zwift was a gamechanger for me as it's really flat where I live so I never have the chance to do any climbs (there's a short overpass that I struggle up during my commute haha).

      I did the Great Ocean and Otway Ride the other week and was getting a little worried about the climbs beforehand, but I ended up powering up them a lot easier than I had anticipated, thanks to doing the Tour of Watopia on Zwift as my training (one of the stages had me climbing 800m in ~30km with some long sections having a gradient of 11-14% - felt like I was gonna die…).

      • Yea, I've been doing alot of Zwift over the Covid period. I did not do Otway Classic just a few weeks ago (I did the 145km and 204km back in 2018&19), but would like to see if all the Zwifting has improved my outdoor riding especially on climbs and over distance too.. Targeting Around the Bay and Amy's Gran Fondo in Oct.

        TOW was tough (especially Stage 5), I did the "lazy" shorter one Mountain 8..

      • Would this be compatible with Zwift?

  • More curious to set it up just to see the power output, but unlikely to improve from there, don't train enough or seriously enough.

  • Thanks have been looking to upgrade recently. Bought 4

  • I've found my powermeter helps with my general riding as well. Clearly training is the main reason you would get one but I know if i look down at the start of a long climb and see that i am putting out 500-600 watts I know I cant keep that going for long enough to finish the climb. I need to back off and lower the watts or I will blow up before I reach the top. Over a hilly route, being smarter at how i spend my watts helps a lot.

    • If you get enough experience you don't need a powermeter to tell you if you are going too hard.

  • Ohhh, that's a good price. Damn my new carbon wheels…….

  • Pretty good price, paid $600 for a Stages Ultegra 6800 Power Meter, still going strong since end 2017

  • is this a crank to replace the existing one on my bike then I'm good to go?
    it appears to be the left side only

    • The main-linked one is left-side only, but the link in the description shows both single and double sided. Apparently its "25% single sided and 20% off dual sided".

    • Your existing crankset will need to be compatible with the left arm they send you. And then yes, you replace the existing one and you're good to go. Your right hand side crank arm and chainrings remain in place.

  • Good price for a great product but worth looking up others experience with the retailer, it isn't great.

    • I've never had a problem with PBK. They're owned by Hut Group (same as MyProtein). Stuff ships from UK, so no dodgy SE-Asian counterfeit/no warranty issues.

    • Placed two seperate orders with them and had no issues. Took 2-3 weeks to arrive from UK even during covid.

    • I had a relatively poor experience with PBK when I bought this from them during COVID. Communication was average at best. That said, the product did end up arriving, just took bloody forever, most of which can be attributed to shipping delays due to lack of planes.

    • I have ordered a set of wheels from PBK, shipped from UK within 3 weeks. Good price, reasonable shipping, no issues.

    • Ive bought plenty of stuff from PBK including carbon wheels. Shipping can be slow but they've always been reliable for me.

    • Thanks for info, good to hear positive feedback about PBK, tempted to get a 2nd 4iiii.

  • Pfff, just 3D… so no time dimension.

  • Great post! I've just impulse bought this like all hell!

    • Nice!! Be sure to check out intervals.icu to help make sense of the data and get a nice email each time you hit a personal best power output!

  • Bugger, no MTB cranks for the CX bike. :(

  • in the last little while, probikekit often have the 4iii powermeters discounted. but this is probably the cheapest yet, or close to. i got one (for m8000 xt though) about 6 months ago, and thought i got a good deal at $500.

    the 4iii is my first crank-based powermeter. it seems to read low. not sure if it is because i dont calibrate it every ride, like i think i am supposed to. or maybe my right leg is much stronger. i am getting much higher numbers out of the other bike, which has a powertap g3 on it, and i know that is accurate as i got it recalibrated last year, and appears to be very consistent since. i dont ride my 4iii-equipped bike very much - if i did, i might be more onto doing the 4iii calibration religiously. one day i'll look into putting the xt cranks (with 4iii) onto my powertap bike and checking if there really is a diff between the two powermeters. there might be a way to adjust the power readings on the 4iii. i suppose consistency is more important than accuracy, but it doesnt work very well when you have multiple powermeters.

    • Can you define much higher?

      Here's a great analysis by DC rainmaker where he compared the two.


      • no i havent done any calcs at this stage. it is kinda a visual thing - after rides that i put particular effort into, i tend to check the power curve in strava, to see how the ride compares to current year PB curve (and often 2019, which was my best year, before COVID hit). with the powertap bike, i am much closer to the PBs (and exceeding them), while on the 4iiii bike, i dont think i've ever come close to pushing the current year PB curve up, even after rides where i feel like i have done some pretty solid intervals. hardly scientific, more perception. it is probably a bit hard to compare when there's different bikes, and i tend to ride different places on each bike. but the perception of the discrepency between the 4iiii and powertap is magnified by the observation that i am getting crazy high correlation between strava segment times and power on my powertap bike, so there's a very predictable power-to-effort relationship with the powertap, and then the 4iii comes up with numbers that aren't (predictable).

        I have looked at DC rainmaker's "scientific" articles quite often. i have probably seen that one before, skimmed it, and got the impression that all the powermeters were pretty close, close enough. looking at it more closely now, you can see that the brown line (4iiii) is the lowest, lower than the rest, only going higher on the higher intensity sprint stuff. for the vast majority or riding, which for me is in the sub-300w range, it is under, but cant tell by what % on those graphs. I do a lot of 2ish minute intervals (lots of strava segments up mostly off road climbs), and i reckon the 4iiii is under for that wattage range too (low to mid 400s on a good day). the 4iiii tends to get spikes too, having seen a few rides with maxes around 1500 and 1600, and i'm pretty sure i've never really been able to hit much more the 1200w, probably more like 1100w lately.

    • How do you know your Powertap isn't reading too high? Just because it got recalibrated doesn't mean it's accurate.

      • the possibility that the powertap is over reading can never be totally ruled out. however, i think it is safe to say that powertap would be one of the most reliable accuracy-wise (also, a lot of reviews of new powermeters often use powertap as the benchmark), and the quite involved calibration process (apparently involving weights etc, to determine torque etc) is such that the accuracy level should be pretty good. if the recalibration process is thorough and is done properly, it should mean that it is accurate.

  • I have this power meter and it's great. Never missed a beat over the last year or so. I recently got Assioma pedals for my new bike, which give me more data (time out of saddle etc.) but for this price the 105 is unbeatable. Almost no point going for Ultegra left pedal except for aesthetic reasons - weight and stiffness are basically identical.

  • Thank you op. Finally getting one :-)

  • Thanks OP. Perfect timing for me.