Gregory L Bownwrote a review of Shimano Dura-Ace 9170 C40 Carbon Disc Brake Road Wheelset - Tubeless on August 9, 2019
Familiarity: I've used it several times
After much indecision... a couple of months reading up on many reviews, etc. I purchased the Dura-Ace 9170 C40 Carbon Disc. I have a set of Reynolds 45/65s, DT Swiss, and have owned Envy's and have to say I am extremely happy with the Dura-Ace 9170 C40 Carbon Disc wheel-set. Without any other changes I literally dropped over 10 minutes on my regular 45 mile ride. Not sure, maybe it is Shimano’s OptBal spoke system?!? but no more spongy old mattress feeling soaking up my efforts, these wheels feel super connected and responsive. The wheel depth is just right, in a strong cross wind I only had to put in minor effort maintaining course to what would have blown me into another car lane had I been riding my Envy's. My Reynolds might be a little lighter but don't feel as responsive. I can't definitively say why, but I am faster and more confident on the Dura-Ace 9170.