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Main
Date: 31 Jul 2007 09:38:20
From:
Subject: tire pressure
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There was / is a formula around that used the reduction in sidewall
height as an indication of pressure, ie: the tire deforms, by a
certain amount when the rider is mounted.
I think the factor was 10% of the casing height. Anyone know what I am
talking about and where I can get a copy of it?
Appreciated
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Date: 31 Jul 2007 18:13:16
From: Ozark Bicycle
Subject: Re: tire pressure
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On Jul 31, 7:21 pm, Camilo <campasc...@yahoo.com > wrote:
> On Jul 31, 2:56 am, Ozark Bicycle
>
>
>
>
>
> <bicycleatel...@ozarkbicycleservice.com> wrote:
> > On Jul 31, 4:38 am, propagandafact...@gmail.com wrote:
>
> > > There was / is a formula around that used the reduction in sidewall
> > > height as an indication of pressure, ie: the tire deforms, by a
> > > certain amount when the rider is mounted.
>
> > > I think the factor was 10% of the casing height. Anyone know what I am
> > > talking about and where I can get a copy of it?
>
> > > Appreciated
>
> > The "ideal" was a ~15% "drop" in casing height. This table gives
> > approximate inflation for a 15% drop v. rider + bike weight for
> > various tire widths:
>
> >http://preview.tinyurl.com/yukgw3
>
> > or
>
> >http://tinyurl.com/yukgw3
>
> What does that ideal 15% represent - the amount of drop in casing
> height that will be ideal for riding on?
According to some bicycle tire manufactuer(s), yes, IIRC. IOW, a tire
with an unloaded height of 35mm would "drop" to a height of ~29mm,
with an attendant gain in width at the contact patch.
> Should we interepret the
> chart as indicating the ideal tire pressure for our weight (on the
> tire)?
The table provides data for the load *per wheel*, assuming a 45/55%
split front v. rear. IOW, a 200lb rider + bike will put 110lbs on the
rear wheel and 90 lbs on the front wheel.
> Thanks.- Hide quoted text -
>
> - Show quoted text -
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Date: 31 Jul 2007 17:21:08
From: Camilo
Subject: Re: tire pressure
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On Jul 31, 2:56 am, Ozark Bicycle
<bicycleatel...@ozarkbicycleservice.com > wrote:
> On Jul 31, 4:38 am, propagandafact...@gmail.com wrote:
>
> > There was / is a formula around that used the reduction in sidewall
> > height as an indication of pressure, ie: the tire deforms, by a
> > certain amount when the rider is mounted.
>
> > I think the factor was 10% of the casing height. Anyone know what I am
> > talking about and where I can get a copy of it?
>
> > Appreciated
>
> The "ideal" was a ~15% "drop" in casing height. This table gives
> approximate inflation for a 15% drop v. rider + bike weight for
> various tire widths:
>
> http://preview.tinyurl.com/yukgw3
>
> or
>
> http://tinyurl.com/yukgw3
What does that ideal 15% represent - the amount of drop in casing
height that will be ideal for riding on? Should we interepret the
chart as indicating the ideal tire pressure for our weight (on the
tire)?
Thanks.
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Date: 31 Jul 2007 04:02:27
From: Ozark Bicycle
Subject: Re: tire pressure
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On Jul 31, 6:00 am, DougC <dcim...@norcom2000.com > wrote:
> Ozark Bicycle wrote:
> > On Jul 31, 4:38 am, propagandafact...@gmail.com wrote:
> >> There was / is a formula around that used the reduction in sidewall
> >> height as an indication of pressure, ie: the tire deforms, by a
> >> certain amount when the rider is mounted.
>
> >> I think the factor was 10% of the casing height. Anyone know what I am
> >> talking about and where I can get a copy of it?
>
> >> Appreciated
>
> > The "ideal" was a ~15% "drop" in casing height. This table gives
> > approximate inflation for a 15% drop v. rider + bike weight for
> > various tire widths:
>
> >http://preview.tinyurl.com/yukgw3
>
> > or
>
> >http://tinyurl.com/yukgw3
>
> That table only goes up to 154 lbs. Is there one for adults somewhere?.....
It's *per wheel", assuming a 45/55% split front v. rear.
If you need higher than that, you need a pretty special set of wheels.
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Date: 31 Jul 2007 03:56:14
From: Ozark Bicycle
Subject: Re: tire pressure
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On Jul 31, 4:38 am, propagandafact...@gmail.com wrote:
> There was / is a formula around that used the reduction in sidewall
> height as an indication of pressure, ie: the tire deforms, by a
> certain amount when the rider is mounted.
>
> I think the factor was 10% of the casing height. Anyone know what I am
> talking about and where I can get a copy of it?
>
> Appreciated
The "ideal" was a ~15% "drop" in casing height. This table gives
approximate inflation for a 15% drop v. rider + bike weight for
various tire widths:
http://preview.tinyurl.com/yukgw3
or
http://tinyurl.com/yukgw3
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Date: 01 Aug 2007 01:31:22
From: Colin B.
Subject: Re: tire pressure
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Ozark Bicycle <bicycleatelier@ozarkbicycleservice.com > wrote:
> On Jul 31, 4:38 am, propagandafact...@gmail.com wrote:
>> There was / is a formula around that used the reduction in sidewall
>> height as an indication of pressure, ie: the tire deforms, by a
>> certain amount when the rider is mounted.
>>
>> I think the factor was 10% of the casing height. Anyone know what I am
>> talking about and where I can get a copy of it?
>>
>> Appreciated
>
> The "ideal" was a ~15% "drop" in casing height. This table gives
> approximate inflation for a 15% drop v. rider + bike weight for
> various tire widths:
>
> http://preview.tinyurl.com/yukgw3
>
> or
>
> http://tinyurl.com/yukgw3
Great chart! I'd be curious to see just how far off the 15% drop one gets
for being under/over inflated. According to the chart, my heavy body on my
heavy bike leads to 112/130psi for my 700x23c tires. Normally I've been
riding with them at about 106psi both front and back. How much am I
overcompressing them I wonder.
Colin
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Date: 31 Jul 2007 06:00:16
From: DougC
Subject: Re: tire pressure
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Ozark Bicycle wrote:
> On Jul 31, 4:38 am, propagandafact...@gmail.com wrote:
>> There was / is a formula around that used the reduction in sidewall
>> height as an indication of pressure, ie: the tire deforms, by a
>> certain amount when the rider is mounted.
>>
>> I think the factor was 10% of the casing height. Anyone know what I am
>> talking about and where I can get a copy of it?
>>
>> Appreciated
>
> The "ideal" was a ~15% "drop" in casing height. This table gives
> approximate inflation for a 15% drop v. rider + bike weight for
> various tire widths:
>
> http://preview.tinyurl.com/yukgw3
>
> or
>
> http://tinyurl.com/yukgw3
>
>
That table only goes up to 154 lbs. Is there one for adults somewhere?.....
~
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