The 4iiii Precision Podiiiium crank-based power meters are now shipping pre-installed on Shimano 105, Ultegra and Dura-Ace cranksets. Shown at last year’s Interbike with the promise of early 2018 delivery, the program is called “Ride Ready” because they ship already attached to a new left-side crank arm. All you need to do is swap out your existing non-drive crank arm and pair it with your head unit and off you go.
The Ride Ready units only come on the three Shimano crank arms, with retail price for the arm plus power meter running from $399 to $599. Or, you can send in your own cranks to have the rechargeable Podiiiium units attached in their factory, then returned. If you don’t mind a short wait, that’ll only run you $399 for left-side only and can be done to virtually any Shimano crankset from 105 and XT or better; SRAM XX1, X01 and Red carbon cranks, Campagnolo Potenza, plus some Cannondale and Praxis cranks, too. Check their website for exact models, and hit up this post for more tech details.