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  #11  
Old April 1st 18, 03:48 PM posted to rec.bicycles.tech
AMuzi
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Posts: 9,641
Default Tires

On 4/1/2018 1:01 AM, John B. wrote:
On Sat, 31 Mar 2018 21:47:45 -0400, Frank Krygowski
wrote:

On 3/31/2018 8:43 PM, John B. wrote:

On a bike with 700C tires I am currently running 23mm tires. Some of
the roads in Bangkok are pretty rough and my front fork could take a
25mm tire, but probably not wider, and I'm wondering whether it is
worth the effort to change from 23 to 25mm tires.

Alternately I could go a bit wider on the rear but again I'm wondering
whether that is worth while as the majority of the bumps I feel
through the front wheel and handle bars and the occasional snake bite
flat I get is always on the front.


Well, there's some data out there that indicates wider tires give lower
rolling resistance, assuming they're high quality with flexible
sidewalls. I see no reason not to try wider ones when you next replace
tires. Unless perhaps your brakes won't open far enough to clear the
inflated tire.

Our roads are famously rough. We see lots of freeze-thaw cycles, most
cities are cash-strapped, and this county has more miles of county roads
than most. But the state's paving money is the same for every county,
regardless of county road mileage. I never ride narrower than 28s. In
fact, most of my bikes have 32mm tires.


I'm wondering whether there would be a benefit from a 2 mm width
increase. 23 - 25?


Categorically I don't know and it may be unknowable. It's so
personal and situational I suggest you just try a 25mm next
time you replace a tire. Some riders prefer wider but some
do not.

Just ditzing around, it's roughly 8% more radius but 17%
more volume.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


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  #12  
Old April 1st 18, 06:00 PM posted to rec.bicycles.tech
[email protected]
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Posts: 267
Default Tires

On Sunday, April 1, 2018 at 2:21:02 PM UTC+2, John B. wrote:
On Sun, 1 Apr 2018 05:12:22 -0700 (PDT), wrote:

On Sunday, April 1, 2018 at 8:03:08 AM UTC+2, John B. wrote:
On Sat, 31 Mar 2018 22:52:45 -0700 (PDT),
wrote:

Op zondag 1 april 2018 02:43:46 UTC+2 schreef John B.:
On a bike with 700C tires I am currently running 23mm tires. Some of
the roads in Bangkok are pretty rough and my front fork could take a
25mm tire, but probably not wider, and I'm wondering whether it is
worth the effort to change from 23 to 25mm tires.

Alternately I could go a bit wider on the rear but again I'm wondering
whether that is worth while as the majority of the bumps I feel
through the front wheel and handle bars and the occasional snake bite
flat I get is always on the front.

--
Cheers,

John B.

What do you mean by is it worth while? A wider tire is proven to be better except for 20 grams in weight. Wait until your current 23 mm tires wear out and replace them by 25 mm or even 28 mm if that is possible.

Lou

Worthwhile - will the additional 2 mm of width - 23 - 25 mm provide a
smoother ride?
--
Cheers,

John B.


Yes if you inflate to 6.5 bar especially on rough tarmac.

Lou


I'm not that fat. I run about 70 PSI in 23 mm tires.

--
Cheers,

John B.


70 psi is 4.8 bar. WTF do you weigh 40 kg?

Lou
  #13  
Old April 1st 18, 06:03 PM posted to rec.bicycles.tech
[email protected]
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Posts: 267
Default Tires

On Sunday, April 1, 2018 at 4:48:56 PM UTC+2, AMuzi wrote:
On 4/1/2018 1:01 AM, John B. wrote:
On Sat, 31 Mar 2018 21:47:45 -0400, Frank Krygowski
wrote:

On 3/31/2018 8:43 PM, John B. wrote:

On a bike with 700C tires I am currently running 23mm tires. Some of
the roads in Bangkok are pretty rough and my front fork could take a
25mm tire, but probably not wider, and I'm wondering whether it is
worth the effort to change from 23 to 25mm tires.

Alternately I could go a bit wider on the rear but again I'm wondering
whether that is worth while as the majority of the bumps I feel
through the front wheel and handle bars and the occasional snake bite
flat I get is always on the front.

Well, there's some data out there that indicates wider tires give lower
rolling resistance, assuming they're high quality with flexible
sidewalls. I see no reason not to try wider ones when you next replace
tires. Unless perhaps your brakes won't open far enough to clear the
inflated tire.

Our roads are famously rough. We see lots of freeze-thaw cycles, most
cities are cash-strapped, and this county has more miles of county roads
than most. But the state's paving money is the same for every county,
regardless of county road mileage. I never ride narrower than 28s. In
fact, most of my bikes have 32mm tires.


I'm wondering whether there would be a benefit from a 2 mm width
increase. 23 - 25?


Categorically I don't know and it may be unknowable. It's so
personal and situational I suggest you just try a 25mm next
time you replace a tire. Some riders prefer wider but some
do not.


Exactly. Why wonder just use them, there are no drawbacks except for some 20 gr weight penalty. Is there a reason to use 23 mm now wider tires are readily available in the top quality range which was the problem 5 years ago.

Lou
  #14  
Old April 1st 18, 06:50 PM posted to rec.bicycles.tech
Duane[_4_]
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Posts: 1,362
Default Tires

AMuzi wrote:
On 4/1/2018 1:01 AM, John B. wrote:
On Sat, 31 Mar 2018 21:47:45 -0400, Frank Krygowski
wrote:

On 3/31/2018 8:43 PM, John B. wrote:

On a bike with 700C tires I am currently running 23mm tires. Some of
the roads in Bangkok are pretty rough and my front fork could take a
25mm tire, but probably not wider, and I'm wondering whether it is
worth the effort to change from 23 to 25mm tires.

Alternately I could go a bit wider on the rear but again I'm wondering
whether that is worth while as the majority of the bumps I feel
through the front wheel and handle bars and the occasional snake bite
flat I get is always on the front.

Well, there's some data out there that indicates wider tires give lower
rolling resistance, assuming they're high quality with flexible
sidewalls. I see no reason not to try wider ones when you next replace
tires. Unless perhaps your brakes won't open far enough to clear the
inflated tire.

Our roads are famously rough. We see lots of freeze-thaw cycles, most
cities are cash-strapped, and this county has more miles of county roads
than most. But the state's paving money is the same for every county,
regardless of county road mileage. I never ride narrower than 28s. In
fact, most of my bikes have 32mm tires.


I'm wondering whether there would be a benefit from a 2 mm width
increase. 23 - 25?


Categorically I don't know and it may be unknowable. It's so
personal and situational I suggest you just try a 25mm next
time you replace a tire. Some riders prefer wider but some
do not.

Just ditzing around, it's roughly 8% more radius but 17%
more volume.


Lower air pressure makes for a softer ride on crap roads.

--
duane
  #15  
Old April 1st 18, 09:53 PM posted to rec.bicycles.tech
Roger Merriman[_4_]
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Posts: 141
Default Tires

John B. wrote:

On a bike with 700C tires I am currently running 23mm tires. Some of
the roads in Bangkok are pretty rough and my front fork could take a
25mm tire, but probably not wider, and I'm wondering whether it is
worth the effort to change from 23 to 25mm tires.

Alternately I could go a bit wider on the rear but again I'm wondering
whether that is worth while as the majority of the bumps I feel
through the front wheel and handle bars and the occasional snake bite
flat I get is always on the front.


Assuming like for like? Marginally yes, more difference in different tyres,
in my experience, be that construction or how close to stated size they
really are and so on.

Roger Merriman

  #16  
Old April 2nd 18, 01:22 AM posted to rec.bicycles.tech
John B.[_3_]
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Posts: 3,967
Default Tires

On Sun, 1 Apr 2018 10:00:05 -0700 (PDT), wrote:

On Sunday, April 1, 2018 at 2:21:02 PM UTC+2, John B. wrote:
On Sun, 1 Apr 2018 05:12:22 -0700 (PDT),
wrote:

On Sunday, April 1, 2018 at 8:03:08 AM UTC+2, John B. wrote:
On Sat, 31 Mar 2018 22:52:45 -0700 (PDT),
wrote:

Op zondag 1 april 2018 02:43:46 UTC+2 schreef John B.:
On a bike with 700C tires I am currently running 23mm tires. Some of
the roads in Bangkok are pretty rough and my front fork could take a
25mm tire, but probably not wider, and I'm wondering whether it is
worth the effort to change from 23 to 25mm tires.

Alternately I could go a bit wider on the rear but again I'm wondering
whether that is worth while as the majority of the bumps I feel
through the front wheel and handle bars and the occasional snake bite
flat I get is always on the front.

--
Cheers,

John B.

What do you mean by is it worth while? A wider tire is proven to be better except for 20 grams in weight. Wait until your current 23 mm tires wear out and replace them by 25 mm or even 28 mm if that is possible.

Lou

Worthwhile - will the additional 2 mm of width - 23 - 25 mm provide a
smoother ride?
--
Cheers,

John B.

Yes if you inflate to 6.5 bar especially on rough tarmac.

Lou


I'm not that fat. I run about 70 PSI in 23 mm tires.

--
Cheers,

John B.


70 psi is 4.8 bar. WTF do you weigh 40 kg?

Lou


I weigh 60 kg. as of this morning and am 5'6" tall. According to the
Berto scale, published in Bicycle Quarterly, years ago, about 70 PSI
is proper.
--
Cheers,

John B.

  #17  
Old April 3rd 18, 05:08 AM posted to rec.bicycles.tech
James[_8_]
external usenet poster
 
Posts: 5,753
Default Tires

On 01/04/18 10:43, John B. wrote:

On a bike with 700C tires I am currently running 23mm tires. Some of
the roads in Bangkok are pretty rough and my front fork could take a
25mm tire, but probably not wider, and I'm wondering whether it is
worth the effort to change from 23 to 25mm tires.

Alternately I could go a bit wider on the rear but again I'm wondering
whether that is worth while as the majority of the bumps I feel
through the front wheel and handle bars and the occasional snake bite
flat I get is always on the front.


I don't understand why you get more snake bite flats on the front tyre,
unless you run substantially less pressure there, or somehow lift your
arse before the back wheel hits.

I use a 23mm front and a 25mm rear, but the rear measures 27mm. It
certainly helps to smooth out rougher roads, of which we have in
abundance.

--
JS
  #18  
Old April 3rd 18, 06:36 AM posted to rec.bicycles.tech
John B.[_3_]
external usenet poster
 
Posts: 3,967
Default Tires

On Tue, 3 Apr 2018 14:08:43 +1000, James
wrote:

On 01/04/18 10:43, John B. wrote:

On a bike with 700C tires I am currently running 23mm tires. Some of
the roads in Bangkok are pretty rough and my front fork could take a
25mm tire, but probably not wider, and I'm wondering whether it is
worth the effort to change from 23 to 25mm tires.

Alternately I could go a bit wider on the rear but again I'm wondering
whether that is worth while as the majority of the bumps I feel
through the front wheel and handle bars and the occasional snake bite
flat I get is always on the front.


I don't understand why you get more snake bite flats on the front tyre,
unless you run substantially less pressure there, or somehow lift your
arse before the back wheel hits.

I use a 23mm front and a 25mm rear, but the rear measures 27mm. It
certainly helps to smooth out rougher roads, of which we have in
abundance.


I'm not sure why I have more flats on the front then the rear but I
do. Both pinch flats and penetration. Memory is always fallible but I
can only remember having one flat on the rear tire and that was caused
by a tiny flake of either glass or quartz that penetrated the
Continental Gatorskin tire and tube.

I generally run the same pressure in both tires, currently 70 PSI with
25mm tires (I only weigh about 60 kg. ) which is about right for the
rear and slightly high for the front.

Some time ago I measured the weight on the front and rear wheels with
rider aboard and, if I remember correctly, the total weight was
supported 45% on the front wheel and 55% on the rear so a larger tire
on the rear is logical although I'm currently running the same size on
both wheels.
--
Cheers,

John B.

  #19  
Old April 3rd 18, 01:39 PM posted to rec.bicycles.tech
Duane[_2_]
external usenet poster
 
Posts: 174
Default Tires

On 03/04/2018 12:08 AM, James wrote:
On 01/04/18 10:43, John B. wrote:

On a bike with 700C tires I am currently running 23mm tires. Some of
the roads in Bangkok are pretty rough and my front fork could take a
25mm tire, but probably not wider, and I'm wondering whether it is
worth the effort to change from 23 to 25mm tires.

Alternately I could go a bit wider on the rear but again I'm wondering
whether that is worth while as the majority of the bumps I feel
through the front wheel and handle bars and the occasional snake bite
flat I get is always on the front.


I don't understand why you get more snake bite flats on the front tyre,
unless you run substantially less pressure there, or somehow lift your
arse before the back wheel hits.


Under inflated tires would be my guess.

I use a 23mm front and a 25mm rear, but the rear measures 27mm.* It
certainly helps to smooth out rougher roads, of which we have in abundance.

  #20  
Old April 4th 18, 05:29 PM posted to rec.bicycles.tech
Joerg[_2_]
external usenet poster
 
Posts: 5,411
Default Tires

On 2018-03-31 17:43, John B. wrote:

On a bike with 700C tires I am currently running 23mm tires. Some of
the roads in Bangkok are pretty rough and my front fork could take a
25mm tire, but probably not wider, and I'm wondering whether it is
worth the effort to change from 23 to 25mm tires.

Alternately I could go a bit wider on the rear but again I'm wondering
whether that is worth while as the majority of the bumps I feel
through the front wheel and handle bars and the occasional snake bite
flat I get is always on the front.


I did that years ago, went to 25mm and never looked back. The rear can
be more important for people (like me) with lower back problems and if
my road bike could take a 28mm or even wider tire on the rear wheel I'd
use that. But it can't.

Pinch flats never happened anymore after I went to thick tubes plus tire
liner. Actually, flats in general don't happen anymore unless there is
hardcore structural tire failure.

If your wrist hurt from all the rattling maybe you could look into
handlebar tape with more cushioning material underneath.

Which reminds me, I mounted my last 25mm tire yesterday, got to buy
another stash. Maybe it's because of the hills but they almost go
through like popcorn. Some like CST Conquistare are worn to the limits
after just 1000mi so if you are in the market I definitely would not
recommend those. Got a Vittoria Zaffiro on the rear now, says made in
Thailand which is usually a good thing when it comes to tires. I am
going to look for Vee Rubber as well because that brand really performed
on the MTB.

--
Regards, Joerg

http://www.analogconsultants.com/
 




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