I have now spent much quality time on these guys equipped with the DT/Swiss 240 hubs and have definitely figured a few things out:
They seem *enormous* at first, but that initial shock goes away quickly, certainly once you get them up to speed and realize the difference they make in keeping you at speed! On flat-to-rolling roads, they are amazingly fast and smooth. Climbing-wise, I've been pleasantly surprised much like I was with the outgoing Enve 6.7. The 7.8's are claimed lighter, so that's even better news. The "whoosh" sound that some of us love about deep-section wheels is even more pronounced than with the 6.7's too. In a dead-out sprint, the folks you're about to blow past will definitely know you're coming! The Enve Carbon Hubs, from my experience with my 4.5, are outstanding! This isn't a wheelset where one should be too concerned with weight, but you will save some grams. The low rolling resistance and smooth, reliable (DT internals) performance are definitely worth the upgrade if you can swing it.
Once pointed downhill, watch out! You'll hit your terminal velocity faster than you have before, but the updated brake surface can handle the 50-0 work remarkably well. I learned this on my 4.5's and it holds true on these. Fast, technical descents do require more care at first, until you get a solid feel of how these wheels corner. Long, sweeping or decreasing radius corners are not their absolute forte, but they are brilliant in fast, tight, flat (think: criterium course) corners. The ease of acceleration after said corners is impressive as well.
They are Tubeless-Ready, but I had a less-than-optimal experience with them setup tubeless (Reach out to me directly for details).
I have ridden them with both Vittoria Corsa-G speed and Continental Grand Prix 4000-S II tires, with a variety of pressures. *Always* use the Enve new-style brake pads.
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