Well, I stand corrected and apologise to all!
Before getting this response from Bill I had been down to measure my
tyres - they are 165s - and sure enough the 165 is the width across
the tyrewalls, not across the tread as I had thought! Actual tread
width is about 150 on these, the walls bulging out about 7mm on each
side. This dosn't work out if you measure the tyre width on the flat
bit at the bottom though, it is wider there. ;-)
So apologies, but I have learn't something new.
PS usefull link - a good site even if they do spell "tyre" wrongly!
----- Original Message -----
From "Bill Hunt" <Billh at aaai.com>
To: "Guy Weller" <firstname.lastname@example.org>; "Chris King"
Sent: 15 November 2002 19:25
Subject: RE: rubberized hieroglyphics
> Check this link for tire info.
> The first number is the width measured sidewall to sidewall and is
> stated as the section width. This measurement is based on a standard
> width as stated by the tire manufacturer. A 205 width's recommended
> width range is usually 5.5 to 7.0. Yes it will vary slightly
> on the width of rim you mount it on.
> Tread widths will vary from tire to tire depending on type of tire,
> aspect ratio as well as manufacturer.
> 64 MKII Sprite (Herbytoy - patiently waiting)
> 62 MKII Sprite (the "resto-mod" driver)
> -----Original Message-----
> From: Guy Weller [mailto:email@example.com]
> Sent: Friday, November 15, 2002 11:08 AM
> To: Chris King; firstname.lastname@example.org
> Subject: Re: rubberized hieroglyphics
> Not sure I agree with this Chris. The width across the points you
> describe will vary depending on various other factors, e.g. width of
> rim it is fitted to ( I know there are recommended rims for any
> width of tyre, but the recommendatuion is usually a range of rim
> sizes); pressure the tyre is run at and weight of vehicle.
> The actual tread width is a fixed amount for any tyre size, and
> to me to be more accurate.
> Still, I'm being pedantic I guess!
> I agree your version of the profile % calculation.
> What we need is someone running a 205 tyre to go and measure it!
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