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Location:
Bendigo
Registered:
June 2004
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Location:
Rocky Mountains, Canada
Registered:
May 2002
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Location:
Cardiff, South Wales, UK
Registered:
October 2003
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Re: I don't like the way this looks -- Simple issue though
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Mon, 12 July 2004 18:53
 
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Hi,
A UK spec' 1979 TA40 was fitted with 165-13 tyres.
They do not have a profile figure in the tyre size.
Found this on the subject though....
" The profile of a "standard" tyre is 80, (i.e. 80% of the width of the tread). Some tyres, especially those fitted on older vehicles, don't display the profile number. So you might have a tyre showing "165x14". If the tyre profile number is not printed on the tyre sidewall, you can assume it is a standard tyre, with the profile number 80. "
Pumping these figures into a tyre comparator such as:
http://www.tyresave.co.uk/tyresize.html
and you end up with a difference of +2.36%
This will have an effect on your overall gearing and speedo calibration - probabably not enough to worry about though.
The extra width may effect other factors of the suspension dynamics though
If you want to work out the tyre size/rear axle ratio/speed calculations etc have a look here:
http://www.britishv8.org/swaps/design.htm
Quite a useful xl spreadsheet
Cheers
GT
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Location:
Cardiff, South Wales, UK
Registered:
October 2003
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Re: I don't like the way this looks -- Simple issue though
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Mon, 12 July 2004 19:00
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| Quote: |
A UK spec' 1979 TA40 was fitted with 165-13 tyres.
They do not have a profile figure in the tyre size.
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I should say that base models were fitted with this size tyre, but am sure some of 2 liter models were fitted with 14" wheels.
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Location:
Adelaide
Registered:
January 2004
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Re: I don't like the way this looks -- Simple issue though
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Mon, 12 July 2004 22:30
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look for the tyre size and pressure stamp?
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On Probation
Location:
North East NSW
Registered:
December 2002
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Re: I don't like the way this looks -- Simple issue though
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Mon, 12 July 2004 23:48
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a 165SR13 tyre, is a 165/82/13 in modern terms. older toyotas usually had a tyre placard in the glovebox, does yours?
there is a decent tyre calculator on my garage page http://www.superjamie.net/garage/
if that is the correct size for your car, and i suspect it would be, then a 165/60/14 is a drive reduction of 8%. when you're doing 100km/h on your speedo, you're really doing 92km/h. when you're doing 108km/h on the speedo, you're really doing 100km/h. this also makes your rolling diameter less, so your car will launch quicker  but have a lower top speed
185/75/13s are a 1.1% increase, i would think that 185/70/13s would be better, at 1.9% reduction
you can also work out the height of your wheel from these numbers (sidewall is a percentage of width, eg: a 200/50/13 tyre has a 100mm sidewall). obviously, two sidewalls plus the diameter of the wheel - and note that if you reduce your wheel height by more than 15mm from stock, then you can be defected (wheel and tyre changes outside this can be engineered, sometimes)
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I supported Toymods
Location:
Perth, Western Australia
Registered:
December 2002
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Re: I don't like the way this looks -- Simple issue though
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Tue, 13 July 2004 00:48
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Yep your original tyre size would have been 165R14 which as Super Jamie points out equates to a 165/82/14 tyre. This figure gives a diamter of 626.2mm, and as such your cureent tyres are too small. Ideally you want to find some 195/70/14's or 205/65/14's for your car to keep your speedo accurate.
your current tyres being 185/75/13 are more suited to cars that originally had 165R13 tyres, like TA22's.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: I don't like the way this looks -- Simple issue though
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Tue, 13 July 2004 02:37
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this also applied to RA28's yes?
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Registered:
June 2004
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Re: I don't like the way this looks -- Simple issue though
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Tue, 13 July 2004 03:32
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look in the door jam, driver's side and there should be a sticker with info on tire pressures and tire size for the car.
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Location:
Bendigo
Registered:
June 2004
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Re: I don't like the way this looks -- Simple issue though
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Tue, 13 July 2004 08:18
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Only thing in the doorjamb was the 'compliance' tyreplate which was made with one of those pressure-labellers and referred to exactly what was on the car, but the wheels are corolla wheels not celica wheels and as a result I sincerely doubt that the information is accurate.
Also whilst driving on the road I felt a little odd at the speedlimit though my experience is a touch limited and it may just be driving position.
Thanks for all your help guys.
On a sidenote, anyone interested in a set of 13" steels and tyres? I'll include wheelcovers! lol
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Location:
Melbourne
Registered:
February 2003
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Re: I don't like the way this looks -- Simple issue though
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Wed, 14 July 2004 03:25
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I know TA40s and TA45s had 13 inch wheels standard, so I'd suspect that a TA46 also came with 13 inch wheels.
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