New wheels, new tires (difference between 700x25, 26, & 28?) - Page 9 - Cycling Mob: Road Cycling, Mountain Biking and More

06-15-2004, 08:58 PM

Steve Knight <[Only registered and activated users can see links. ]> writes:

>> Thanks, Frank. I've already ordered some 26s, but when I current
>> ones wear out I'll move to something a bit bigger, if I haven't
>> lost more weight by then.

> I use 25's (that's the max that will fit my bike) and when I started
> I was 270 now 235) the only problems I had was when I did not keep
> them inflated to the max PSI but my ride is a bit bumpy.

That's a good reason not to by that kind of frame. How do you ride on
wet roads or even or dirt roads with not enough clearance to fit the
next larger tire (1mm in radius)?

Jobst Brandt
[Only registered and activated users can see links. ]

06-16-2004, 05:17 AM

In article <[Only registered and activated users can see links. ]>,
[Only registered and activated users can see links. ] says...
> On Tue, 15 Jun 2004 18:36:48 +0000, Dennis Ferguson wrote:
>
> > In article <[Only registered and activated users can see links. ].edu>,
> > Frank Krygowski <[Only registered and activated users can see links. ]> wrote:
> >>Roger Zoul wrote:
> >>
> >>> I've a heavy rider (240lbs). My current wheels (28 spokes on the rear) have
> >>> 700x26c tires.
> >>>
> >>> I've ordered a new wheelset due to spokes breaking on the rear (36 spokes on
> >>> the rear). I'm thinking of putting 700x25c or 700x28c tires on this
> >>> one...will I notice any significant differences?
> >>
> >>Personally, I'd go with at least 28. If I had your weight, I'd probably
> >>look at 32 mm, if it would clear the frame and brakes.
> >>
> >>A narrow tire might give very slightly less rolling resistance on
> >>perfectly smooth roads, but if the road has any significant roughness,
> >>you'll probably be better off with a wider tire.
> >
> > That is not how I understand it. If you take two tires which are
> > constructed the same, inflated to the same pressure and placed under
> > the same load, the widest tire will be the one with the least rolling
> > resistance since it is the tire which will deform the least at the
> > contact patch.
>
> Yes, but. Thing is, a bigger tire does not need, and usually is not rated
> for, as high a pressure as the skinnier tire. So, riding each tire at the
> rated max pressure, the skinny one will have less rolling resistance.

Maybe. Depends on how *much* higher the pressure is. My Conti Sport
1000 in 25mm have the same rated max pressure as the Ultra 2000's in 23
mm.

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Remove the ns_ from if replying by e-mail (but keep posts in the
newsgroups if possible).

06-16-2004, 05:17 AM

In article <[Only registered and activated users can see links. ]>,
[Only registered and activated users can see links. ] says...
> On Tue, 15 Jun 2004 18:36:48 +0000, Dennis Ferguson wrote:
>
> > In article <[Only registered and activated users can see links. ].edu>,
> > Frank Krygowski <[Only registered and activated users can see links. ]> wrote:
> >>Roger Zoul wrote:
> >>
> >>> I've a heavy rider (240lbs). My current wheels (28 spokes on the rear) have
> >>> 700x26c tires.
> >>>
> >>> I've ordered a new wheelset due to spokes breaking on the rear (36 spokes on
> >>> the rear). I'm thinking of putting 700x25c or 700x28c tires on this
> >>> one...will I notice any significant differences?
> >>
> >>Personally, I'd go with at least 28. If I had your weight, I'd probably
> >>look at 32 mm, if it would clear the frame and brakes.
> >>
> >>A narrow tire might give very slightly less rolling resistance on
> >>perfectly smooth roads, but if the road has any significant roughness,
> >>you'll probably be better off with a wider tire.
> >
> > That is not how I understand it. If you take two tires which are
> > constructed the same, inflated to the same pressure and placed under
> > the same load, the widest tire will be the one with the least rolling
> > resistance since it is the tire which will deform the least at the
> > contact patch.
>
> Yes, but. Thing is, a bigger tire does not need, and usually is not rated
> for, as high a pressure as the skinnier tire. So, riding each tire at the
> rated max pressure, the skinny one will have less rolling resistance.

Maybe. Depends on how *much* higher the pressure is. My Conti Sport
1000 in 25mm have the same rated max pressure as the Ultra 2000's in 23
mm.

--
Remove the ns_ from if replying by e-mail (but keep posts in the
newsgroups if possible).

06-16-2004, 05:17 AM

In article <[Only registered and activated users can see links. ]>,
[Only registered and activated users can see links. ] says...
> On Tue, 15 Jun 2004 18:36:48 +0000, Dennis Ferguson wrote:
>
> > In article <[Only registered and activated users can see links. ].edu>,
> > Frank Krygowski <[Only registered and activated users can see links. ]> wrote:
> >>Roger Zoul wrote:
> >>
> >>> I've a heavy rider (240lbs). My current wheels (28 spokes on the rear) have
> >>> 700x26c tires.
> >>>
> >>> I've ordered a new wheelset due to spokes breaking on the rear (36 spokes on
> >>> the rear). I'm thinking of putting 700x25c or 700x28c tires on this
> >>> one...will I notice any significant differences?
> >>
> >>Personally, I'd go with at least 28. If I had your weight, I'd probably
> >>look at 32 mm, if it would clear the frame and brakes.
> >>
> >>A narrow tire might give very slightly less rolling resistance on
> >>perfectly smooth roads, but if the road has any significant roughness,
> >>you'll probably be better off with a wider tire.
> >
> > That is not how I understand it. If you take two tires which are
> > constructed the same, inflated to the same pressure and placed under
> > the same load, the widest tire will be the one with the least rolling
> > resistance since it is the tire which will deform the least at the
> > contact patch.
>
> Yes, but. Thing is, a bigger tire does not need, and usually is not rated
> for, as high a pressure as the skinnier tire. So, riding each tire at the
> rated max pressure, the skinny one will have less rolling resistance.

Maybe. Depends on how *much* higher the pressure is. My Conti Sport
1000 in 25mm have the same rated max pressure as the Ultra 2000's in 23
mm.

--
Remove the ns_ from if replying by e-mail (but keep posts in the
newsgroups if possible).

06-16-2004, 05:17 AM

In article <[Only registered and activated users can see links. ]>,
[Only registered and activated users can see links. ] says...
> On Tue, 15 Jun 2004 18:36:48 +0000, Dennis Ferguson wrote:
>
> > In article <[Only registered and activated users can see links. ].edu>,
> > Frank Krygowski <[Only registered and activated users can see links. ]> wrote:
> >>Roger Zoul wrote:
> >>
> >>> I've a heavy rider (240lbs). My current wheels (28 spokes on the rear) have
> >>> 700x26c tires.
> >>>
> >>> I've ordered a new wheelset due to spokes breaking on the rear (36 spokes on
> >>> the rear). I'm thinking of putting 700x25c or 700x28c tires on this
> >>> one...will I notice any significant differences?
> >>
> >>Personally, I'd go with at least 28. If I had your weight, I'd probably
> >>look at 32 mm, if it would clear the frame and brakes.
> >>
> >>A narrow tire might give very slightly less rolling resistance on
> >>perfectly smooth roads, but if the road has any significant roughness,
> >>you'll probably be better off with a wider tire.
> >
> > That is not how I understand it. If you take two tires which are
> > constructed the same, inflated to the same pressure and placed under
> > the same load, the widest tire will be the one with the least rolling
> > resistance since it is the tire which will deform the least at the
> > contact patch.
>
> Yes, but. Thing is, a bigger tire does not need, and usually is not rated
> for, as high a pressure as the skinnier tire. So, riding each tire at the
> rated max pressure, the skinny one will have less rolling resistance.

Maybe. Depends on how *much* higher the pressure is. My Conti Sport
1000 in 25mm have the same rated max pressure as the Ultra 2000's in 23
mm.

--
Remove the ns_ from if replying by e-mail (but keep posts in the
newsgroups if possible).

06-16-2004, 05:17 AM

In article <[Only registered and activated users can see links. ]>,
[Only registered and activated users can see links. ] says...
> On Tue, 15 Jun 2004 18:36:48 +0000, Dennis Ferguson wrote:
>
> > In article <[Only registered and activated users can see links. ].edu>,
> > Frank Krygowski <[Only registered and activated users can see links. ]> wrote:
> >>Roger Zoul wrote:
> >>
> >>> I've a heavy rider (240lbs). My current wheels (28 spokes on the rear) have
> >>> 700x26c tires.
> >>>
> >>> I've ordered a new wheelset due to spokes breaking on the rear (36 spokes on
> >>> the rear). I'm thinking of putting 700x25c or 700x28c tires on this
> >>> one...will I notice any significant differences?
> >>
> >>Personally, I'd go with at least 28. If I had your weight, I'd probably
> >>look at 32 mm, if it would clear the frame and brakes.
> >>
> >>A narrow tire might give very slightly less rolling resistance on
> >>perfectly smooth roads, but if the road has any significant roughness,
> >>you'll probably be better off with a wider tire.
> >
> > That is not how I understand it. If you take two tires which are
> > constructed the same, inflated to the same pressure and placed under
> > the same load, the widest tire will be the one with the least rolling
> > resistance since it is the tire which will deform the least at the
> > contact patch.
>
> Yes, but. Thing is, a bigger tire does not need, and usually is not rated
> for, as high a pressure as the skinnier tire. So, riding each tire at the
> rated max pressure, the skinny one will have less rolling resistance.

Maybe. Depends on how *much* higher the pressure is. My Conti Sport
1000 in 25mm have the same rated max pressure as the Ultra 2000's in 23
mm.

--
Remove the ns_ from if replying by e-mail (but keep posts in the
newsgroups if possible).

06-16-2004, 09:26 AM

>That's a good reason not to by that kind of frame. How do you ride on
>wet roads or even or dirt roads with not enough clearance to fit the
>nest larger tire (1mm in radius)?

well I got the bike in a trade and it was an excellent deal. it is a fantastic
italian racing frame.
[Only registered and activated users can see links. ] though mine
has the original forks. you can't see the frame details campy dropouts and cool
details.
it's not the practical bike for commutes but it is what I have so I make due.
I ride wet roads all the time on it. portland or is pretty wet.
If I could afford another bike I may get a bent. but then I would not be riding
this one.

--
Knight-Toolworks & Custom Planes
Custom made wooden planes at reasonable prices
See [Only registered and activated users can see links. ] For prices and ordering instructions.

06-16-2004, 09:26 AM

>That's a good reason not to by that kind of frame. How do you ride on
>wet roads or even or dirt roads with not enough clearance to fit the
>nest larger tire (1mm in radius)?

well I got the bike in a trade and it was an excellent deal. it is a fantastic
italian racing frame.
[Only registered and activated users can see links. ] though mine
has the original forks. you can't see the frame details campy dropouts and cool
details.
it's not the practical bike for commutes but it is what I have so I make due.
I ride wet roads all the time on it. portland or is pretty wet.
If I could afford another bike I may get a bent. but then I would not be riding
this one.

--
Knight-Toolworks & Custom Planes
Custom made wooden planes at reasonable prices
See [Only registered and activated users can see links. ] For prices and ordering instructions.

06-16-2004, 09:26 AM

>That's a good reason not to by that kind of frame. How do you ride on
>wet roads or even or dirt roads with not enough clearance to fit the
>nest larger tire (1mm in radius)?

well I got the bike in a trade and it was an excellent deal. it is a fantastic
italian racing frame.
[Only registered and activated users can see links. ] though mine
has the original forks. you can't see the frame details campy dropouts and cool
details.
it's not the practical bike for commutes but it is what I have so I make due.
I ride wet roads all the time on it. portland or is pretty wet.
If I could afford another bike I may get a bent. but then I would not be riding
this one.

--
Knight-Toolworks & Custom Planes
Custom made wooden planes at reasonable prices
See [Only registered and activated users can see links. ] For prices and ordering instructions.

06-16-2004, 09:26 AM

>That's a good reason not to by that kind of frame. How do you ride on
>wet roads or even or dirt roads with not enough clearance to fit the
>nest larger tire (1mm in radius)?

well I got the bike in a trade and it was an excellent deal. it is a fantastic
italian racing frame.
[Only registered and activated users can see links. ] though mine
has the original forks. you can't see the frame details campy dropouts and cool
details.
it's not the practical bike for commutes but it is what I have so I make due.
I ride wet roads all the time on it. portland or is pretty wet.
If I could afford another bike I may get a bent. but then I would not be riding
this one.

--
Knight-Toolworks & Custom Planes
Custom made wooden planes at reasonable prices
See [Only registered and activated users can see links. ] For prices and ordering instructions.