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Changed Tires From 700x23 to 700x25

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Changed Tires From 700x23 to 700x25

Old 09-05-15, 12:30 PM
  #1  
Catinella
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Changed Tires From 700x23 to 700x25

My Trek 1500 SLR (2005) has had nothing but 23mm tires ever since I bought it (used). As a novice rider, when it became clear I needed new tires, I was a little concerned about replacing the tires with anything but 23mm. These tires were after all, what came on the bike and were what I was used to. Anyway, after a lot of thought and research, I decided to go ahead and try a set of 25mm tires of the same brand, Continental Ultra Sport II.

I went out for my first ride on the new tires this morning on a route that I have ridden many times. I found the ride was much smoother on the new 25mm tires, and some of the bumps and cracks on the trail that I had always felt on my 23mm tires, seemed hardly noticeable on my new 25mm tires. (The big bumps are always noticeable!)

I ran my old 23mm tires at 90/95 and the new 25mm tires at 80/85. I weigh 140 pounds (10 stone). My 20 mile ride today was about 3 minutes faster than my average on this route. Was I having a good day, or can new larger tires with a slightly lower tire pressure make that much difference?
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Old 09-05-15, 12:45 PM
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Slightly lower pressure makes that much difference. I wouldn't even ride road bikes on my chip seal roads if I had to use 90/95. I use 65/75. I think my tires are 31/29mm with a 70kg rider, 11 stone.
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Old 09-05-15, 01:48 PM
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You can go down even more on the front. I weigh 150 and keep the front at 70psi (90 rear). Last flat was over 8000 miles ago.
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Old 09-05-15, 02:47 PM
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new tires are new.

old tires are old tires.
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Old 09-05-15, 03:04 PM
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Originally Posted by bt View Post
new tires are new.

old tires are old tires.
Wow! Really?

Never really knew that, thanks.
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Old 09-05-15, 03:53 PM
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I still prefer 23 tires but built myself a set of Kinlin 23 wide rim xc279. I find I can ride about 95 on the front and 105-110 on the rear and I am 178 pounds. I still am one who likes more pressure and find it does better with not getting anything on the tire as it rolls. Normally I would ride 105-120 for 19 cm wide rims.
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Old 09-05-15, 06:34 PM
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Originally Posted by Catinella View Post
I ran my old 23mm tires at 90/95 and the new 25mm tires at 80/85. I weigh 140 pounds (10 stone). My 20 mile ride today was about 3 minutes faster than my average on this route. Was I having a good day, or can new larger tires with a slightly lower tire pressure make that much difference?
You were having a good day or favorable winds. If the tires were the same type then it might make a few watts difference but nowhere near enough to make 3min difference. For reference if your were riding at 20mph, shaving 3 min means your speed was about 5% higher which would require roughly 15% extra power or about 30W. You might save 3W with the wider tires.
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Old 09-05-15, 06:40 PM
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I went to 25's and won't ever go back.
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Old 09-05-15, 06:58 PM
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Originally Posted by bt View Post
new tires are new.

old tires are old tires.
WOW!!!!!! What an absolutely brilliant response.
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Old 09-05-15, 08:28 PM
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Originally Posted by Lazyass View Post
You can go down even more on the front. I weigh 150 and keep the front at 70psi (90 rear).
I'll see how the 80/85 feels over the next few rides and then try 70/90.


Originally Posted by bt View Post
new tires are new. old tires are old tires.
True. The rubber on the old 23s seems harder and dried out when compared to the new tires. I don't know how old the 23s were, but I'm sure rubber deteriorates with age.


Originally Posted by gregf83 View Post
You were having a good day or favorable winds.
I'll choose, "Having a good day"!
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Old 09-06-15, 06:47 AM
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I have been on 23's since I bought my Caad10 a couple years ago but thanks to everyone praising 25's and how much better they're overall cycling experience is I decided to try a set. I was very disappointed upon my first ride with the 25's which were the same Tubeless Fusion 3's I had previously. The bike felt slower, almost like it was weighted down, hard to explain but the bike just doesn't feel as snappy as it did before. I will wear this set out and be back to some 23's soon.
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Old 09-06-15, 07:35 AM
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Originally Posted by bt View Post
new tires are new.

old tires are old tires.
What is an old tire that's put on new called?
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Old 09-06-15, 07:54 AM
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Why do the English quote weight in 14 lb increments? And why is it not stones instead of stone for more than one? Inquiring minds want to know. I mean stone is a perfectly fine unit of measure, but only if taken to two decimal places. If I could ignore the difference between 154 and 168 lbs (11 and 12 stone), my life would surely be a hell of a lot simpler. One stone represents the entire range of weight I have experienced through my entire adult life. Does that range not need to be broken down a little bit more precisely?
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Old 09-06-15, 08:30 AM
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Originally Posted by rpenmanparker View Post
Why do the English quote weight in 14 lb increments? And why is it not stones instead of stone for more than one? Inquiring minds want to know. I mean stone is a perfectly fine unit of measure, but only if taken to two decimal places. If I could ignore the difference between 154 and 168 lbs (11 and 12 stone), my life would surely be a hell of a lot simpler. One stone represents the entire range of weight I have experienced through my entire adult life. Does that range not need to be broken down a little bit more precisely?
And further why do we still use tons as the measurement for air conditioners?
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Old 09-06-15, 08:34 AM
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Originally Posted by StanSeven View Post
What is an old tire that's put on new called?

getting by til pay day?
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Old 09-06-15, 08:38 AM
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Originally Posted by bt View Post
new tires are new.

old tires are old tires.
Captain oblivious lol!
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Old 09-06-15, 09:13 AM
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Originally Posted by rpenmanparker View Post
Why do the English quote weight in 14 lb increments? And why is it not stones instead of stone for more than one? Inquiring minds want to know. I mean stone is a perfectly fine unit of measure, but only if taken to two decimal places. If I could ignore the difference between 154 and 168 lbs (11 and 12 stone), my life would surely be a hell of a lot simpler. One stone represents the entire range of weight I have experienced through my entire adult life. Does that range not need to be broken down a little bit more precisely?
I associate "stone" with horse weight, 80 or 90 stone, so analogous to human weight in kilograms.

I think it also varied according to what was measured, which is weird for a "standard". But all English measurements seem weird.
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Old 09-06-15, 10:09 AM
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Originally Posted by gregf83 View Post
You were having a good day or favorable winds. If the tires were the same type then it might make a few watts difference but nowhere near enough to make 3min difference. For reference if your were riding at 20mph, shaving 3 min means your speed was about 5% higher which would require roughly 15% extra power or about 30W. You might save 3W with the wider tires.
^This.

We're talking TWO FREAKING MILLIMETERS!

I can't tell a dime's difference between a 23 and a 25- in any respect. Start getting up to 28's, then you can feel the extry weight giving a little extra drag.
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Old 09-06-15, 11:23 AM
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I have a set of those Ultra Sport 25's in my shop as spares. They are very smooth and some of that is with size but mostly tire design. They were removed from a Trek racer I bought and being a folding bead 23mm fan I could feel the difference with a heavy wire bead tire set immediately. The Trek racer now wears a crazy-light folding bead set of 23's running 115psi. I dont ride on rough, cracked pavement much here so to me its a case of speed and weight when I dont need the more sluggish wire bead tire.
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Old 09-06-15, 11:28 AM
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Originally Posted by Stucky View Post
^This.

We're talking TWO FREAKING MILLIMETERS!

I can't tell a dime's difference between a 23 and a 25- in any respect. Start getting up to 28's, then you can feel the extry weight giving a little extra drag.
2 freaking millimeters is an 18% change in cross section size.
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Old 09-06-15, 12:06 PM
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Originally Posted by StanSeven View Post
What is an old tire that's put on new called?
NOS Rubber, duh.
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Old 09-06-15, 12:07 PM
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Originally Posted by Marcus_Ti View Post
2 freaking millimeters is an 18% change in cross section size.

Yup...the ensuing difference in pressure is quite noticable...That is if you know how to figure such things out...then again, "We're talking TWO FREAKING MILLIMETERS! "

Lmfao
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Old 09-06-15, 12:25 PM
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Originally Posted by UnfilteredDregs View Post
Yup...the ensuing difference in pressure is quite noticable...That is if you know how to figure such things out...then again, "We're talking TWO FREAKING MILLIMETERS! "

Lmfao
Another way to look at it...the difference between 23 and 25mm tires..... a 23mm is roughly the size of a US $0.25 coin (~24.2mm) and a 25mm is roughly equal to a US Sacajawea Dollar coin (~26.5mm).

2mm sounds like not a whole lot...especially if you're used to Imperial units no one but the US uses anymore...Maybe some day we'll stop using tons to measure air conditioner performance, although I won't hold my breath....I will say though, that there's good historical reason for using tons to describe cooling capacity-ofc this is the 21st century and those reasons date back to the 19th and early 20th.
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Old 09-06-15, 12:35 PM
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Originally Posted by Marcus_Ti View Post
2 freaking millimeters is an 18% change in cross section size.
I think you mean 8%.
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Old 09-06-15, 12:38 PM
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Originally Posted by Marcus_Ti View Post
Another way to look at it...the difference between 23 and 25mm tires..... a 23mm is roughly the size of a US $0.25 coin (~24.2mm) and a 25mm is roughly equal to a US Sacajawea Dollar coin (~26.5mm).

2mm sounds like not a whole lot...especially if you're used to Imperial units no one but the US uses anymore...Maybe some day we'll stop using tons to measure air conditioner performance, although I won't hold my breath....I will say though, that there's good historical reason for using tons to describe cooling capacity-ofc this is the 21st century and those reasons date back to the 19th and early 20th.
I have two friends who are HVAC guys....you can imagine what the topic of conversation will be with them this week!
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