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

Tire Widths?

Old 02-09-09, 12:31 AM
  #1  
jnlabay
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Tire Widths?

Whats the diffrence between a 23mm and 25mm tires or is there really a diffrence...Looking for some new tires probably the Michellin Pro Race 3 or GP4000 and they sell them in 2 diffrents widths and trying to figure out the diffrence.
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Old 02-09-09, 12:40 AM
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2mm
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Old 02-09-09, 12:47 AM
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Lol
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Old 02-09-09, 01:41 AM
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Originally Posted by jnlabay View Post
Whats the diffrence between a 23mm and 25mm tires or is there really a diffrence...Looking for some new tires probably the Michellin Pro Race 3 or GP4000 and they sell them in 2 diffrents widths and trying to figure out the diffrence.
You know enough to buy Pro Race 3 or GP4000, but you don't know the difference b/t a 23mm and 25mm.

Um, the 25 mm is wider than the 23 mm.
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Old 02-09-09, 01:50 AM
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in case you are for real, buy either one and you will be fine.
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Old 02-09-09, 01:53 AM
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Personally, I just like the looks of the 25 over the 23....but like ride among us said...either one will do fine.
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Old 02-09-09, 02:10 AM
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What are your roads like? Cobbles, potholes, rough roads make a case for the 25s.
I've used a 23 front/25 rear combo quite happily.
The 23s will be slightly more aerodynamic, but, get ready for it, have slightly higher rolling resistance.

Bring it on.
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Old 02-09-09, 02:15 AM
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Originally Posted by Metzinger View Post
What are your roads like? Cobbles, potholes, rough roads make a case for the 25s.
I've used a 23 front/25 rear combo quite happily.
The 23s will be slightly more aerodynamic, but, get ready for it, have slightly higher rolling resistance.

Bring it on.
i understand that they would be more aerodynamic because of the smaller width, but i dont understand how a smaller tire would have a higher rolling resistance. Care to explain?
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Old 02-09-09, 02:19 AM
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oh here we go again!
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Old 02-09-09, 02:21 AM
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Originally Posted by cwathne View Post
i understand that they would be more aerodynamic because of the smaller width, but i dont understand how a smaller tire would have a higher rolling resistance. Care to explain?
Thats what many studies now say.
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Old 02-09-09, 02:23 AM
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Originally Posted by Cdy291 View Post
Thats what many studies now say.
ok, and Al Gore says that sea levels are going to be like 15 ft higher in 50yrs; doesn't mean its true

again, anyone care to explain why a larger contact area with the ground would create LESS rolling resistance??
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Old 02-09-09, 02:25 AM
  #12  
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25's do make a nice difference if you're riding on less than ideal roads. Regardless of what is claimed about rolling resistance, 25's feel a tiny bit slower than 23's to me. You can also run slightly lower pressure for a more comfy ride too. It's a small deifference either way. You could also split the difference and get some 24's, like Vittoria Open Paves.
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Old 02-09-09, 02:35 AM
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The whole crr thing has been rehashed many times.
Resistance relates to specific tires, under specific loads, at specific pressures on a specific surface.

"Rolling resistance is casued by rubber deformation losses in the
tread, the tube and the casing. The tube is firmly attached to the
casing by inflation pressure so it is like a tread inside the tire.
The whole tire flexes in three dimensional space, X, Y and Z. You can
verify this typically by laying a stadard business card between tire
and tube. It will shred to fine confetti when ridden. It is this
motion that causes hysteretic loss in the elastomer in the casing, the
tread and the tube. If the tire has patterned tread, such as a knobby
tire has in the extreme, deformation of the tread into the voids will
cause additional loss. That is why knobby tires roill so poorly."

Jobst Brandt

I mostly wanted to stir the s--t. Because nobody can say tire A is faster than B without factoring in all the variables.
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Old 02-09-09, 02:36 AM
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Please refer to one of the many posts on RR and tire width. http://www.bikeforums.net/showthread...hlight=rolling
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Old 02-09-09, 07:52 AM
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I'll try to give you a serious answer...

If you are talking about a 23 and a 25 version of the same tire, the 25 will feel a little more sluggish if you ride the 23 and then ride the 25. The practical difference for you as a cyclist is that if you would normally inflate the 23 to about 100, you could probably inflate the 25 to about 85-90 psi. That gives you a bit softer ride over road imperfections.

If you are talking about two different tires from different manufacturers, then you can only answer your own question by trying them. There's no other basis for comparison. They might even end up being the same width on your bike, because manufacturers' tiring sizing varies quite a bit, the rubber compounds aren't the same, the TPI is counted differently, etc.

If you don't already have some idea of the difference between a 23 and a 25, then you should probably not worry about rolling resistance. It's a totally abstract and relative concept anyway, fodder for pedantic blowhards to feel superior explaining it, and it greatly depends on the inflation pressures you use. In effect, it's totally meaningless for you in the real world. The only consideration for you should be how much do you want to feel or not feel the imperfections on the road.
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Old 02-09-09, 10:23 AM
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The most important difference between 23 and 25mm tires from the same brand and model is that the correct tire pressure for the 25mm is around 10 psi lower, so you will get a cushier ride (maybe too soft for some people). The wider tire also reduces the risk of pinch flats, which is a big deal for bigger people.

Arguments about rolling resistance or aerodynamics are BS. There is a measurable weight difference, but that is usually pretty small.
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Old 02-09-09, 11:04 AM
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Originally Posted by johnny99 View Post
The most important difference between 23 and 25mm tires from the same brand and model is that the correct tire pressure for the 25mm is around 10 psi lower, so you will get a cushier ride (maybe too soft for some people). The wider tire also reduces the risk of pinch flats, which is a big deal for bigger people.

Arguments about rolling resistance or aerodynamics are BS. There is a measurable weight difference, but that is usually pretty small.
this is the correct answer

i can attest to it
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Old 02-09-09, 11:33 AM
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The contis in the same size tend to be narrower than michelin and less than the listed size.
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Old 02-09-09, 12:00 PM
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Just get the contis in 23mm, assuming you are riding reasonably paved roads and weigh less than 180.
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Old 02-09-09, 12:40 PM
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Originally Posted by cwathne View Post
again, anyone care to explain why a larger contact area with the ground would create LESS rolling resistance??
It's one of those statements that has truth in it but probably isn't really true. If you really care PM me and I'll explain the issues for you.
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