Attack/Force.

IIRC the Attack/Force combo will have a lower CRR.

You can rotate the GP4000S and it wears, so a big cost savings to keep the freshest (most aero) tire up front and rotate to the rear. With Attack/Force all you can do is replace both.

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The attack/force combo is going to have less flat protection right? Any other downside?

I've gone through two attacks with bad flats. Force still going strong.

Tread is thinner. Everything else is the same.

Attack Force is 3 watts faster but that doesn't account for aero benefits...that said, if want the fastest option just go super sonic or turbo cotton.

True. But I like to at least consider flat protection as well.

I run an attack up front, and a GP4000s in the back... then I keep a spare GP4000S handy in case either one fail. Knock wood... I've had pretty good luck with no flats.

Attack/Force should be faster. Attack ~same Crr as GP4000s 23c but narrower so should have less CdA, I heard mounting it backwards improves the aero performance even more, maybe someone else will chime in on that and confirm. Force has less Crr than GP4k 23c. PSA, you can buy a A/F set here for $95 & free shipping.

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<We all know that light travels faster than sound. That's why certain people appear bright until you hear them speak>

that's the kind of logic that'll get you branded a heretic around here.

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The secret of a long life is you try not to shorten it.
-Nobody

Attack/Force. Fact. Period.

And the Specialized Turbo Cotton even faster?

I've got a buddy who does this. He's fast as hell, so even if it's not the best option it's not like I can say much about it!

Vittoria Pista EVO CS! Which is essentially a latex tube.

Shape of tire on rim big part of equation.

Vittoria Pista EVO CS! Which is essentially a latex tube.

If I used tubulars, that's what I'd put on the front. Crono on the back.

I use it as on the front disc in my track pursuit setup, and that's it. I'd be afraid to on almost any road. It makes the Supersonic look like a Gatorskin. I speculate that it'd instantly shred if you locked up a wheel just for a moment.

I see that bike24.de has Continental GP Force II and GP Attack II in stock, couldn't find anything at continental.de though. Just a slight update, like with GP4000S, or? The combo is also available, but as a non-II version. All are labeled as 2016 batch though.

Conti changed Attack/Force to be a 23/25mm pair, now available in German online stores.

Are you sure? Bike24 has the II versions (individual package) still as 22/24mm

What is your tolerance for flats? It has been over two years and like 30+ races on Supersonics since I have had a flat. In that time I have seen literally 100s if not thousands of flats.

How did you come to the conclusion that supersonics have no flat protection?

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eg. http://www.bike-discount.de/...set-23-25-622-574153

Weird. Because even the Conti site has them as 22/24. Maybe some sites have taken it upon themselves to report true widths instead of those advertised, as Conti's never run true to size imo.