I rode these tires on a tour in Canada this Summer. At first I was worried about the notion that being a flatless tire would mean that I'd feel like I was riding on big hard-to-push sponges or something. Not so. The first thing I noticed about these tires was how they ironed out the road any time I ran into less than ideal quality road surface . . . which is most of the time. I also use Schwalbe Marathon Racers on the same bike, and so I can speak directly to the issue of rolling resistance. The Racers are great on to be sure, but I'd say the Marathon Plus tires outshine them when it comes to rougher roads. If you've ever run on a coated running track, these tires feel just like that, they just take the edge of bumps and vibrations that tires with higher rated rolling resistance do, and I think this results in a slightly smoother and more efficient ride over the long haul.
However, even though the rolling resistance is pretty good on these tires, at the end of the day, there rolling resistance places an exceedingly small roll in the overall resistance a cyclists feels and it would be frankly absurd to even worry about this for anything less than competition . . . Schwalbe as a nice chart on their page that compares the percentages of the different kinds of resistance that someone experiences when riding.
Grip excellent. I have a few different bikes and run Conti 4000s, Schwalbe Marathon Racers, and these tires, and in all honesty, there's no discernible difference in any condition other than racing. However, no one buys these for racing, you buy them because you want a tough fast city tire, or a rugged touring tire.
Flatless I cannot comment on this feature as I've yet to have a flat tire. Reviews are meaningless when they rate a tire's vulnerability to puncture based on how soon after purchase someone received a puncture, or how they've ridden one set of tires for ages without a puncture, then bought a different set, road the same course and suddenly got a puncture. Tire punctures are caused mainly by random events, things falling off cars and trucks and some road construction, etc., and then, by some extremely high level of chance, turns out the offending object fell directly into the tiny piece of the road your tire covers, AND just happened to be positioned in such a way so as to jab through the rubber. It's frankly surprising anyone gets punctures. Still, they happen, to everyone, at random intervals. The Schwalbe tires simply put a whole lot of stuff between your tubes and the road, and at the end of the day, that's all anyone can do.
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