Say what? Backwards?

Anyone use the gp4000s II in a 20mm yet? I have one and a supersonic...debating which one to put on for a rough road racine 70.3 in July.

Some retailers are advertising the Attack/Force "ii" (as in version #2). Per Wiggle.com's description of the "ii":


@rruff, do you know which version was used to gather the data?

@GreatScott, by "backwards", I think the idea is to mount an Attack on the rear, but with the rotation arrow facing the opposite direction as the front Attack, mimic'ing the Force's tread pattern:

Got it, thanks.

Now I'm just trying to understand the benefits of running the Attack in back. Won't the wider Force have lower Crr, with the aero penalty offset by being back in the wash?

Scott

Mine are pre II. I couldn't find anything on Conti's site about what might have changed... they don't even list them. Doubt the new ones are any better honestly.

Attacks are probably more aero if installed backwards, meaning that side grooves at the top of the wheel point towards the rear rather than front. That's based on Swiss Side's testing.

Where is the line where the better aero trumps the tiny Crr increase of a smaller tire? Don't know, but I suspect the Attack is already "too big". You can run fat tires if you want... but I won't be.

Agree the Force is fat. Nice fast rolling tire, bit of a plusher ride than the GP4000s, but rubs on the chain stay of my S2 when hammering around corners. Now I use GPS4000s back and Attack on the front. The Attack blends very smoothly with my narrow front wheel. Reckon it would blend well on my hed3 too, haven't had chance to try will when the Bont aero wears out.

I'll take that advice! How do wide rims affect your perspective on fat tires? For example, the 24.4mm Flo 60/90. Based on this and related threads, I was thinking the 22mm Attack and 24mm Force would be a nice fit. Now I'm thinking Attack/Attack or Atttack/GP 4000s.

Scott

On wide rims the clincher tires grow in width. The Force will be ~26mm wide on that rim, the Attack ~24mm.

I know this happens a lot on this site....Newbie looking for recommendations on what tire to use....but here we go!

Did sprint triathlons last year and doing Olympics this year leading up to the Rev3 Cedar Point Half in September.

I have a Trek Madone 3.1 and rode on the stock tires Bontrager R1 (700x23c) in 2012. Went into Bike Authority in Cleveland in the Spring of 2013 looking for new tires. They gave me the Vittoria Rubino Pro (Non-Slick) 700x23c and I used those during the 2013 triathlon season.

Stumbled on to this site to find that the Rubino Pros are probably not what I should be riding on, even though I was happy with the price tag at the time.

Looking for an upgrade in the $60 to $80 per tire range. Any suggestions?

Any feeling on how the Attack/Force would pair up with Enve 6.7s? My "windtunnel eyeball" makes me think the Attack "looked" too narrow for that wider front rim. **disclaimer I a novice on this stuff**. Thanks,

I wonder what you think there is about a narrow tire that would be detrimental to aero? I'd probably run 20mm Supersonics on those rims... but that's just me. If you think you'll be hitting potholes and rocks and stuff, then a bigger tire is warranted... but not for aerodynamics.

From everything I've seen Conti pretty much owns the market if you want fast tires with decent durability. They are usually cheapest from UK sites, like Ribble and Wiggle. The GP4000S 23 was $36 on Ribble for instance. And get Vittoria latex tubes (<$10) while you are at it. And make sure you install them right so you don't kill yourself.

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Thanks, like I indicated I am total aero novice so all input is apprecaited.

And I'll bet they didn't turn the Attack backwards... should have helped the high-yaw numbers.

Funny I just ordered two GP4KS from wiggle as well as some latex tubes. Curious what you mean by installing right to not kill yourself. I've never ridden latex, well at least on a bike.

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"Base training is bull shit" - desertdude

Just ordered a GP4000s from Amazon last week. Got it for 44.95 with free shipping. Had it in 3 days. I've seen them cheaper on some UK sites but the fast shipping sealed it for me.

Of note the description on the site was for a GP 4000s and I received the updated GP 4000s II. Not sure they're different except for some graphics.

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Formerly DrD

If you get tube pinched under the bead, instead of experiencing an immediate failure it can push the tire off a few hundred miles later.

Oh shit. Lots of powder and care I guess.

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"Base training is bull shit" - desertdude

they are colored tubes, so you can do your bead seat check on both sides of tires and if you don't see the latex tube, you are good. if you do, work it I such that you dont

I am going to order the GP4000S today on Amazon. Looking forward to trying them out.

I can't remember the last time I even needed to unpinch a tube during installation... been many years anyway.

Powder tire and tube both, wipe off excess.
Inflate tube just enough to hold shape.
Install one tire bead.
Stick valve in wheel and then the rest of tube... seat it fully and evenly onto the rim with no twists, stretches, or bulges.
Push valve away from rim tape a little and seat the next bead at that point.
Work the bead around both sides, ensuring that it is in the center of the rim bed. Pull it down with your hands to stretch it.
If you can't get the last bit on by hand and you are worried about pinching the tube with a lever, use a Koolstop Bead Jack.
Check for a pinched tube.
Press on tire at the valve to ensure that it is against the rim tape when you inflate. If you don't then the tube might wrap under itself at the valve.

Picked up some calipers today and measured the Force at 27mm and Attack at 25mm (twice). Both at 100 psi on a Flo 60/90. That Attack measurement surprised me as it is quite different than the 22mm spec.

That is because you are measuring on wide rim wheels versus a standard rim.

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