Power measure with power meter device or use trainer?

Hi, so very new to Zwift and getting the hang of things.  For now since it is so cold outside (in NE), just using my KICKR Snap with Zwift and other programs which is great including for monitoring power.

However once it warms up and if I want to continue with power measurements while riding outside, presume I could swap to a power meter of some sort like the powertap P1s.  Question is, do people then recommend for consistency that I might already get and use the P1s so I have the same devices being used to measure power both with the KICKR and outside, or does that seem overkill?

Thanks in advance of thoughts here.  I have also been scratching my head as to the best option for me as to a power meter.  The P1s seem the simplest for me to add, but the downside is I lose the use of my speedplays which I love.  On the other hand I can’t really use the Powertap C1 as I have an ultegra 6800 crank which is not compatible (four versus 5 bolt), and since I use a trainer wheel, not really interested in using two powertap hubs…

Any other thoughts/solutions.  Wish there was some sort of meter I could just add on to my chainring or the crank without having to swap off pedals or run into another issue like this - perhaps there is that people would recommend.

Have you looked at Stages Power Meters: https://stagescycling.com/us/products/shimano-ultegra-6800/

They are only left side only, but that is not really an issue for most people. They are also duel band which is a huge plus.

I am in a similar boat. I love my Speedplay pedals and I also want consistency between indoor and outdoor riding. There are a lot of people using a Kickr with a power meter, so you will have a lot of company.

I think I will be pulling the trigger on purchasing the Stages in the next week.

Wow, seems like the PERFECT solution.  Thank you.

Too bad you can’t just buy the power meter device itself and somehow place and config it on an existing crankarm.  Or did I misunderstand, and you don’t need to buy the whole arm but just the device?

You need to buy the left arm only if you already have the crank (which you do). Make sure you purchase the correct crank arm length and also you might want to make sure it fits using this method: https://support.stagescycling.com/en/support/solutions/articles/1000137517-how-can-i-find-out-if-my-bicycle-is-compatible-with-the-stages-power-meter-

Got it.  Thanks!

I am actually thinking to go through my local cycling shop here in Brooklyn since I think they carry (or can order) everything and since they know my bike can take care of ensuring everything works smoothly.

Wish I could just test things and see though, since for instance I do like that the powertap P1s can be moved bike to bike super easy versus obviously this solution…

No perfect one!

Looks like 4iiii also has a left arm solution as well as a dual.  Did you look at that and just decide Stages is a better option?  Seems like 4iii may be slightly less expensive though question is whether you buy the whole crankarm or lose one for a couple of weeks for them to retrofit.

Never really looked at the 4iiii until just now. Not a fan of the battery cover, but like you said the price is lower. I think I am going to stick with the Stages, but I’m sure that the 4iiii would be a great option too. I do like that I could sent in my existing crank and get a duel sided power meter for under $800, but right now I cannot be without it for that long.

Pioneer has a left side only, but the down fall is it is not duel band.

I hear you on losing the full crankset.  But man, the price is right!  And given some of the reviews I am seeing, sounds like people generally are happy.

Sigh, may need to sleep on this over the weekend and just be happy with my KICKR right now.  Not like i need to spend more $$ on all of this when I am still feeling my way around my first road bike in 20 years and now with Zwift and a trainer too.

Looks like the crank set install (right side) is for a Dura Ace 9000 ONLY: http://4iiii.com/wp-content/uploads/2016/12/4iiii-Crank-Compatibility-Dec-1-2016.pdf

That kind of sucks that it is not for a 6800.

I have a 2013 Trek Madone 4.7 http://archive.trekbikes.com/us/en/2013/Trek/madone_4_7_h2_compact#/us/en/2013/Trek/madone_4_7_h2_compact/details 

I was thinking about getting the Powertap P1, but this 6800 power meter crank looks like a good solution.

My crank is a Shimano Ultegra, 50/34 (compact), so can I replace the left crank of this with a 6800 ?



I think for the Precision Pro you are right, only Dura Ace if you want to purchase it in full versus sending in your own crankset, but my impression is if you send in your full crankset, you probably are not limited to just dura ace.

I guess it may be worth pinging 4iii about it.  My recollection reading reviews on DCRainmaker.com was that the 4iii guys are really responsive, so I was thinking to reach out to them on this.

Would be strange they can’t retrofit any crankset if you send it all in - but that is the big question - do I really want to take the whole assembly off and be sitting here waiting for it?  They really should have some sort of loaner program where they let you swap out with a demo kits while yours is in their shop, and then once they send yours back, you send theirs back!


If you click on the image for sending in your crank you get to this page: https://4iiii-innovations.myshopify.com/collections/power-meters/products/precision-pro

Looks like the only option is the Dura Ace 9000 for that as well. Must be something with the configuration of the crank were it only fits on the 9000. Might be worth sending them a message to see if that is true.

Emailed 4iiii this morning, response follows: “Thanks for your interest in the PRECISION Pro power meter. The Ultegra Dual is on our roadmap but we don’t have a scheduled release date yet. We will announce to all our customers when it becomes available. Let me know if you need anything else.”


So clearly on the horizon.  Guess one idea is to go get the single crank arm and hope when they provide for the full pro option, they have an upgrade path like they have offered for the dura ace.