Which is better for racing triathlon? These will be glued to 808 tubies, and have read the 21 mm diameter is the best for zipp wheels. The crono appears to be lighter with perhaps better rolling resistance. The crono is $8 more per tire.
Crono tests faster (Crr) than the Evo, so for a TT or Tri, the Crono it is. Reportedly not very puncture resistant though?
Corsa it is then! i dont want to have to use the pit stop, and the corsa has to roll better than my tufo’s-which never flat.
Cronos roll really well, but I managed only 130ish miles on one at IMFL last year, unfortunately about 20 of those were on the thursday, punctured right outside Hooters on the way back in to town - dilema: Ribs and a beer, or get on with racing? decisions, decisions.
Cronos roll really well, but I managed only 130ish miles on one at IMFL last year, unfortunately about 20 of those were on the thursday, punctured right outside Hooters on the way back in to town - dilema: Ribs and a beer, or get on with racing? decisions, decisions.
Curiously I will have to take a decision today. I have a set of Crono and a set of EVO CX ready to install in a Blackwell 100/disc wheelset. The Crono is a 20 size and the EVO a 21 and that means a slightly margin of safety for the rollout with the Crono. In the other hand we have the higher risk of a puncture on the road with the Crono.
I did not need to hear that a Crono punctured in front of a Hooters when I am just about to install a set! 
Undies… If I send a Vittoria pit stop can to your place, Can you use it on that tubular injecting just 10 grams of the stuff and then pinch it again with a pin to see if it works using it in a profilactic manner? I guess you have nothing to loose and the experiment will be greatly appreciated by the ST community.
Best wishes,
Sergio
I for one would love to hear the results of that experiment… nothing worse than the concept of having a great effort ruined by a flat.
I run the Crono CS on the front and the CX on the back.
I rarely have front flats, so I opt for the lighter, narrower tire. I find the 20mm CS actually measures about 20.5 and works nicely on my 404 tubular.
I opt for the CX 23 on the back hoping for a little more durability and cushioning, since the rear tire is blocked by the frame for the most part, with regard to aerodynamics.
I would love to do the experiment, but the tub never made it back to the UK, I don’t think it even left PCB. Binned it when I picked the bike up at the end of the day.
Have you actually seen and handled a Crono Evo CS? It’s next to nothing. I honestly couldn’t imagine trusting it for much more than a ten mile TT. I bought one just to check it out. I’ll use it as a spare I’ll carry for longer races. I’m sure it’ll fold up nice and flat. I can’t imagine the minimal extra speed you might get with the Crono being worth the extra flat risk.
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Have you actually seen and handled a Crono Evo CS? It’s next to nothing. I honestly couldn’t imagine trusting it for much more than a ten mile TT. I bought one just to check it out. I’ll use it as a spare I’ll carry for longer races. I’m sure it’ll fold up nice and flat. I can’t imagine the minimal extra speed you might get with the Crono being worth the extra flat risk.
If you think the Crono EVO is next to nothing you should take a look at the Pista EVO. This tubular is the lightest and also the fastest tubular we have ever used. It rides FAST but it also feels like a mosquito could puncture it.
The Pista EVO is only 135 g versus the 270 g of the Corsa EVO. This tubular is very easy to spot because of the white sidewalls. In the begining of this video you can see these tubulars. http://youtube.com/watch?v=H9yZQAFbEjM I would not used them but in a very clean velodrome and then it has to be a very smooth velodrome.
I think it is a good idea to use the Crono as a spare. What are the chances of puncturing twice in a race?
Sergio
I am also surprised by how thin and flexible they are. You can find the coefficients for rolling resistance of similar tires and plug the numbers into programs that will calculate your improvement in speed. The best tt tires will probably save you at least 10 watts which is quite a significant amount of time. If a race course is known to usually be fairly clean I would take a 10% or so risk of flatting for that time gain, but it’s not for everyone.