The Praxis Zayante CarbonX 4iiii Power Crank gives a relatively cheap route into power measurement for the racer or data enthusiast who wants to see what watts they are kicking out. It's a very good chainset in its own right, with crisp and confident shifting, and you are getting the complete package too, including chainrings.
The Zayante CarbonX is based around a pair of carbon fibre cranks that are impressively stiff and keep the weight down. Stepping on the cranks saw no sign of flex anywhere, even when hauling myself as hard as possible up some steep local climbs.
The Zayante uses a 30mm/28mm spindle which possibly helps with the stiffness over the smaller 24mm used by Shimano and others. It does mean you'll need a specific Praxis M30 bottom bracket, though.
What makes the Praxis different to many other cranksets on the market is that the spider holding the chainrings is separate to the drive-side crank, to give a direct mount system. The X-Spider, as Praxis calls it, attaches to the back of the crank using three T25 Torx bolts.
What this means is that although the 4iiii Power Crank comes with 52/36-tooth chainrings, you could swap them for others in the Praxis range with ease; you can even remove the X-Spider and fit a 1x Direct Mount chainring if you wanted.
Most riders who are after a power meter are likely to be at the performance end of the market, and I think that 52/36t is a good choice.
This setup has been quite a long term test, and after a fair few thousand miles – a lot of them in the wet, as it has been fitted to my full mudguard-equipped Kinesis T2 – there are very few signs of wear to the teeth on the rings.
Shifting is great, and easily on a par with the likes of Shimano Ultegra or SRAM Force, two other chainsets I've been riding alongside the Praxis.
The Zayante Carbon+ comes with a 4iiii power meter fitted to the inside of the non-drive side crank and it's a neat little unit, adding barely anything to the overall weight of the chainset.
Mat reviewed the 4iiii as a standalone product a little while back and was very impressed. In fact, when you've finished here, why not head over to his in-depth report which includes plenty of graphs and the like for even more detail.
On the whole, my findings were pretty much the same as Mat's. I found the 4iiii to be reliable, tracking closely to other power meters I've been using throughout the last year including a Quarq. More importantly, though, the 4iiii seems to be consistent.
Battery life is impressive, too, and with it being a CR2032 3V you can pick one up for a few quid and change it yourself.
The only downside to having a single-sided setup is that it only measures one leg (the left in this case) and then doubles it.
The various times I've been tested using a Wattbike I typically have a balance of 50/50%, which sometimes slips to 49/51%, so for me it shouldn't have too much of an effect on the overall readings, but if your balance is skewed one way or another then the discrepancies could be much larger.
One of the biggest things going for the Praxis is its price: just £700 for a carbon fibre chainset with power meter, including chainrings. The bottom bracket will cost you another £35 on top.
I've mentioned the Quarq, a power meter from SRAM's sister company, and one of those with SRAM Red carbon cranks costs £858 – and that doesn't include chainrings.
If you want a dual-sided system, then one we've tested is the Shimano Dura-Ace FC-R9100-P power meter. You certainly can't fault the shifting precision from Shimano's top flight crankset, but it'll set you back £1,499.99 at retail.
Overall, I've enjoyed using the Praxis power meter over the months. It's proved itself to be very reliable both in terms of chainring wear and as a power meter. Both have stood up to the elements well, and performance is very good.
Super-stiff chainset that offers a good value way of measuring your power output
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road.cc test report
Make and model: Praxis Zayante CarbonX 4iiii Power Crank
Size tested: 172.5mm
Tell us what the product is for and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?
Praxis says, "With Levatime II X-Spider & Rings | The Zayante Carbon is the ultimate marriage of lightness, stiffness and versatility... and riders also have the option of a factory installed left arm power meter.
"The name Zayante comes from a famous redwood-covered road climb here in Santa Cruz and so we felt the name was fitting. These cranks instal with our M30 family of BB's : BSA, BB86, 386EVO, BB30, PF30, T47, BBRight or older Specialized OSBB road frame. LevaTime II is our new generation of shifting tech.
"Updated to a new stiffer LT2 5mm big ring, this allowed our engineers to increase the amount of shift features and the type of shift features we could forge into the ring.
"It also allowed us to use our new fast engaging forged shift pins to improve shift speed. Holding it together with even better support is our beefed-up LT2 forged X-Spider.
"All of this adds up to the fastest and most snappy feeling shift we've ever produced."
A stiff and clean shifting chainset with the addition of a reliable power meter at a very good price.
Tell us some more about the technical aspects of the product?
* Carbon Arms | Direct Mount X-Spider 160/104BCD.
* 165/170/172.5/175mm lengths.
* X-Rings 52/36t.
* M30 Spindle | Requires Praxis M30 BB.
* Works with 10/11sp chains.
* Weight: 620g+/- (172.5mm with 52/36t).
* Q-Factor: 147mm.
Tell us how the product performed overall when used for its designed purpose
Easy to install and the shifting is very good. The power meter gives reliable and consistent readings too.
Tell us what you particularly liked about the product
Reliable power measurement and a simple-to-use app.
Tell us what you particularly disliked about the product
Some riders will prefer dual-sided power data.
How does the price compare to that of similar products in the market, including ones recently tested on road.cc?
The Praxis is good value for money at £700 when you compare it to another carbon fibre crankset like the SRAM Red Quarq Dzero which has an rrp of £858 – and that doesn't include rings. If you want a dual-sided meter, something like the Shimano Dura-Ace FC-R9100-P is over the twice the price at £1,499.99; that's quite a bit extra to quantify.
Did you enjoy using the product? Yes
Would you consider buying the product? Yes
Would you recommend the product to a friend? Yes
Use this box to explain your overall score
The Praxis Zayante Carbon+ Power Crank Chainset delivers great shifting, loads of stiffness and a reliable power reading for what is not a huge amount of money.
About the tester
I usually ride: This month's test bike My best bike is: B'Twin Ultra CF draped in the latest bling test components
I've been riding for: Over 20 years I ride: Every day I would class myself as: Expert
I regularly do the following types of riding: time trialling, commuting, club rides, sportives, fixed/singlespeed,
With 20 years of road cycling and over 150,000 miles in his legs it's safe to say Stu is happiest when on the bike whatever the weather. Since writing his first review for road.cc back in 2009 he has also had a career in engineering including 3D-CAD design and product development, so has a real passion for all of the latest technology coming through in the industry but is also a sucker for a classic steel frame, skinny tyres, rim brakes and a damn good paintjob.
His fascination with gravel bikes is getting out of control too!