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Ideal Road Tire Width: 25mm Wins!

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Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Ideal Road Tire Width: 25mm Wins!

Old 11-11-18, 10:55 PM
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McBTC
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Ideal Road Tire Width: 25mm Wins!

As they say, It’s a conclusion that’s hard to resist.

Turns out, 25mm tires are faster than 23s. Got it-- less rolling resistance equals more speed. Moreover, putting aside performance lost on the bumps, rocks and holes of bad roads, 25s may actually be faster than 28mm tires as well.

Most braking, however, happens on the front tire (3x more than on the rear) so, for safety's sake, it might be advisable to put a wider 28mm tire on the front and lower the pressure a bit to increase the contact area. Or, 28s all around and ride a little slower but enjoy the greater comfort and maybe save a few bucks and the latest expensive frame and shock absorbing technology.

Test: Are wider tyres really faster? 23mm vs 25mm vs 28mm | Cyclist
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Old 11-11-18, 10:57 PM
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My 38mm Compass tires are my fastest ones.
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Old 11-11-18, 11:03 PM
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Is this happening again? Did I just wake from a coma?
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Old 11-11-18, 11:17 PM
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"The width of your tyres can have an influence on a number of features of your bike and the way it rides, and chief among them is speed."

Opening sentence from article. Editor on vacation?
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Old 11-11-18, 11:23 PM
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Originally Posted by DrIsotope View Post
Is this happening again? Did I just wake from a coma?
It's the smoke.
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Old 11-11-18, 11:29 PM
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23mm is the fastest, even on modern wide wheels.
Lighter, more aero, handle crosswinds better than fatter tires.
Any minimal rolling resistance loss is more than made up by other factors.

For comfort, no doubt 25 and 28s are better and maybe 25's are a good tradeoff for most.
But anything bigger than 23 is a compromise if you are concerned about absolute speed.

You also have to determine how tests are listing the tires. By label or actual width.
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Old 11-11-18, 11:31 PM
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Originally Posted by DrIsotope View Post
Is this happening again? Did I just wake from a coma?
It wasn't a coma ... just a very short nap.
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Old 11-11-18, 11:48 PM
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Originally Posted by wgscott View Post
My 38mm Compass tires are my fastest ones.
Mine are not.
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Old 11-11-18, 11:50 PM
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Originally Posted by Dean V View Post
Mine are not.
Let some air out.
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Old 11-12-18, 12:12 AM
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It isn’t even clear if they used the same tire in all 3 sizes.
They don’t understand that the primary energy loss with decent tires is suspension losses, not tire deflection. That is a really dated idea.
Those speeds are exceedingly low. Just steering to balance would be a big variable.
Sample size is much too small to show significance. That is all just noise in the data.
It is like that Adam Savage quote “Remember kids, the difference between just messing around, and science, is writing it down”.
Well, not really.
I don’t think I will be making any decisions based on this article.
It would be fun to do a test like this, however.
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Old 11-12-18, 05:48 AM
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The course was 100 meters?
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Old 11-12-18, 06:59 AM
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Originally Posted by McBTC View Post
As they say, It’s a conclusion that’s hard to resist.
Is that what they say? I thought that it was, it's hard to resist a conclusion that you want to hear.
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Old 11-12-18, 07:52 AM
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25s balloon out to about 28mm on my wheels. Way too big. 23s are about 25mm, which is still a bit large but okay for aggressive cornering in crits. For absolute speed for time trials or the like, I put the 19mm rim with a 21mm tire on.
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Old 11-12-18, 09:09 AM
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Originally Posted by Lazyass View Post
The course was 100 meters?
I like seeing some semblance of a real world road test vs measuring everything on a drum covered by metal treadplate. I've wondered if some tires are stickier than others which might not be picked up by a treadplate test.

Additional speed and distance would be nice.
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Old 11-12-18, 09:15 AM
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Originally Posted by tomato coupe View Post
It wasn't a coma ... just a very short nap.
A comma.
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Old 11-12-18, 10:43 AM
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Old 11-12-18, 10:46 AM
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I've thought of the wind factor as not being that big a deal since the rear wheel is sheltered by the seat tube so, we're only talking about the front tire. But, it all adds up... enough so that Greg Lemond won the TdF by a whisper (an aero helmet).

My past experience is probably like many who've ridden bikes since days of 27" tires. Other than sew-ups which we all knew were the racers' choice (and knowing air pressure was involved there), our "racing" tires where, "inch-and-an-eighth whereas, the all-around, do-all tire of choice might be, inch-and-a-quarter tires... even good for a loaded tour.

But, if you felt a bit exposed, being away from home on a tour and carrying an extra 30 pounds or so, maybe you'd experiment with putting an 'expedition' tire, an inch-and-three-eighths, on the rear but then... that probably seemed a bit overkill if you were used to narrower tires.

In mm, that works out to 25s, 28s and way big, 35s. Of course, all of these tire choices fit on vintage Treks so it was all seat-of-pants impressions with few if any technical constraints.

Déjà vu all over again... 25s are racing tires and 28s... you could tour on'm.
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Old 11-12-18, 10:51 AM
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Originally Posted by wgscott View Post
Let some air out.
Are you talking about a Bicycle or a Jeep?
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Old 11-12-18, 02:05 PM
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LeMond's tech in the 89 TdF
Largest contributor: Aero tri bars
Aero helmet
He also rode with a smaller front wheel. Technically, more rolling resistance.
At that time, many rode with hyper skinny tires at very high pressures.

Originally Posted by McBTC View Post
I've thought of the wind factor as not being that big a deal since the rear wheel is sheltered by the seat tube so, we're only talking about the front tire. But, it all adds up... enough so that Greg Lemond won the TdF by a whisper (an aero helmet).

My past experience is probably like many who've ridden bikes since days of 27" tires. Other than sew-ups which we all knew were the racers' choice (and knowing air pressure was involved there), our "racing" tires where, "inch-and-an-eighth whereas, the all-around, do-all tire of choice might be, inch-and-a-quarter tires... even good for a loaded tour.

But, if you felt a bit exposed, being away from home on a tour and carrying an extra 30 pounds or so, maybe you'd experiment with putting an 'expedition' tire, an inch-and-three-eighths, on the rear but then... that probably seemed a bit overkill if you were used to narrower tires.

In mm, that works out to 25s, 28s and way big, 35s. Of course, all of these tire choices fit on vintage Treks so it was all seat-of-pants impressions with few if any technical constraints.

Déjà vu all over again... 25s are racing tires and 28s... you could tour on'm.
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Old 11-12-18, 03:17 PM
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Originally Posted by SpeedofLite View Post
LoL.

That guy's hair is awesome.


-Tim-
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Old 11-12-18, 03:20 PM
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Brylcreem


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Old 11-12-18, 07:49 PM
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I think, therefore I am.

I think Conti GP4ksII 25's are the fastest tires you can put on a set of Hed Ardennes Plus wheels.....Therfore they are (until I'm proven wrong). If you'd like to prove me wrong please send me a pair of your choice for fast tires, and I'll be happy to give them a long term review.

Last edited by Wileyrat; 11-12-18 at 07:53 PM.
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Old 11-12-18, 08:35 PM
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Posting and You:

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Old 11-12-18, 08:46 PM
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Originally Posted by Wileyrat View Post
I think, therefore I am.

I think Conti GP4ksII 25's are the fastest tires you can put on a set of Hed Ardennes Plus wheels.....Therfore they are (until I'm proven wrong). If you'd like to prove me wrong please send me a pair of your choice for fast tires, and I'll be happy to give them a long term review.
Just binged GP4000S vs Rubino Pros and apparently you may in large part be right on but on the whole... not totally correct. At any rate, I was glad to learn Rubinos had unmatched longevity and puncture resistance.
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Old 11-12-18, 09:00 PM
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Originally Posted by McBTC View Post
Just binged GP4000S vs Rubino Pros and apparently you may in large part be right on but on the whole... not totally correct. At any rate, I was glad to learn Rubinos had unmatched longevity and puncture resistance.
I used to ride Rubino Pro's on my CF Ridley, and still do on my 83 Team Fuji.
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