Interesting, but to be honest, I don't really take any notice of measurements, watts, rolling resistance and all that, because that all says nothing whatsoever about how a tyre feels out on the road - and that's what matters most to me. My Gatorskins are definitely more comfortable on a long ride and I feel less fatigued at the end - and fatigue has a lot to do with comfort. Sure, I know they will puncture more easily than my Marathons and won't last as long. But I can fix punctures easily enough (only had one so far this year) and I can afford a new pair of tyres every couple of years - and I consider that a price well worth paying for superior comfort. For me, Marathons come into their own when some of the surfaces I ride on get a bit softer, and the better grip then swings the balance in their favour*. So when our hot dry summer comes to an end I'll be back on those. And as an aside, I find my Marathon Greenguards easy to get on and off.Keep in mind that Gatorskins are lighter in weight because they don't have anywhere near the puncture resistance nor the tread life that the Marathons have, also Gatorskin Duraskin sidewalls are very thin and flimsy which attributes to the tires smoother ride but it also makes the tire much more prone to sidewall damage then any other tire on the market that's not a Conti, almost the entire line of Conti road tires have thin flimsy sidewalls and the Duraskin sidewall is not designed to take much damage. Also a smoother riding tire feels faster when in reality it may not be, in fact the Gatorskin rolling resistance takes 20.2 watts to turn with 100 psi whereas the Marathon Greenguard takes only 1.1 watt more...you cannot feel 1.1 watts, the very least amount of watts a human can perceive is 3 watts, now a 1 watt difference could make or break a 100 mile race by about 10 seconds but neither of those tires are racing tires so gaining 10 seconds over 100 miles is not even remotely important nor remotely noticeable; what you are feeling is the smoother ride of the Gatorskin. And when you think about it, only losing 1 watt of energy over a tire that is about 450 grams lighter is truly amazing.
The sidewall thickness of the Gatorskin is just .7 mm thick whereas the Marathon Greenguard is 1.65 mm thick; the tread thickness is 3.2 mm thick for the Gator and 7.3 for the Greenguard. The Marathon plus a bit thicker in the tread and sidewall vs the Greenguard. Thicker sidewalls do make installing them more difficult which is something to keep in mind, however also keep in mind that a tough to install tire will be tougher to come off the rim if a blowout occurs, and for that reason I prefer tough to install tires. I found the Marathon to be difficult to install so I heated them in an over at 125 degrees for about 20 minutes which made it a bit less difficult, also using a tool called the VAR Tyre RP-42500 lever makes putting on that last 2 or so inches a snap.
According to recent tests the top three tires for puncture resistance in order of least to best is #3 Schwalbe Marathon Greenguard; #2 Schwalbe Marathon Plus; and #1 the Vittoria Randonneur...but this tire is noticeably slower using a full 12 watts more than the Schwalbe tires, I'm not going to want to haul 45 or pounds of weight around and be slowed down some more by tires! So while the Vittoria may have the best puncture resistance on the market I'll go with the Schwalbe.
Speaking of rolling resistance, you can reduce rolling resistance by 1 to 2 watts on any tire by simply using liberal amount of talc on the tube before you install; and you can reduce it another 2 to 3 watts using latex tubes but I find these tubes to be too fragile plus they're difficult to patch.
Because I only use those tires on my touring bike, and since I don't like to have flats when I tour especially in the rear I've installed a flat liner in the rear tire only called the Clean Motion RhinoDillos, there is no test for rolling resistance using these liners. I use only Specialized Turbo tubes which don't weigh as much as a lot of other regular tubes, and their consistency is good and their valves are high quality.
*Just to add, I also switch to the Marathons if part of my ride is on rougher tracks but I don't want to use my MTB (like if I'm doing a 60-70 mile ride partly on such tracks - I'm no good on my MTB for much beyond 40 miles)
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