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cairns27

Joined: Thu Dec 23, 2010 7:42 pm
Posts: 489
Location: Macleay Island
Vehicle: '95 Vitara JXI LWB G16B

Posted: Wed Dec 14, 2011 8:28 am

There's a lot about tyres I don't undertand,

I've got shitloads,..235/75R15'

They're foot print is different..185 to 200.wide.?

How is this so ?

bye

steak_knife

az supporter

Joined: Fri May 22, 2009 11:30 pm
Posts: 21335
Location: Smart Ass Island

Posted: Wed Dec 14, 2011 9:50 am

cairns27 wrote:

There's a lot about tyres I don't undertand,

I've got shitloads,..235/75R15'

They're foot print is different..185 to 200.wide.?

How is this so ?

bye

Tyre's blow goat's......

235 is 235mm, that's metric
the profile Ie..... 235/75/ what ever is a percentage of the width

Now the good bit!!!

14, 13, 17, 12, 18, 24.....

inch's..... :roll:

Oh, what was the question???

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atari4x4

az supporter

Joined: Mon Dec 11, 2006 10:30 pm
Posts: 34842
Location: East Radelayed
Vehicle: SV420+SV620 Vitara's

Posted: Wed Dec 14, 2011 10:00 am

and to convert them to imperial i use this website

http://www.onlineconversion.com/tire_si ... ersion.htm

235/75/r15 = 28.9"

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Scrawny

I live here!

Joined: Tue Jan 29, 2008 10:30 pm
Posts: 10528
Location: Brissie
Vehicle: Popemobile

Posted: Wed Dec 14, 2011 10:00 am

Is it random, unclear question night tonite?

steak_knife

az supporter

Joined: Fri May 22, 2009 11:30 pm
Posts: 21335
Location: Smart Ass Island

Posted: Wed Dec 14, 2011 10:04 am

Scrawn wrote:

Is it random, unclear question night tonite?

why??

Is that normal???

Craig.....

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whincup

az supporter

Joined: Sat Apr 17, 2010 11:30 pm
Posts: 1588
Location: Gracemere, QLD
Vehicle: '94 suzuki maruti

Posted: Wed Dec 14, 2011 11:31 am

235/75R15...

235=235mm wide

75 is the 'profile', or height, of the tyre measured as a percentage of the width... meaning 235mmx75%= ~175mm. you double this because the 'profile' is between the rim and the surface contact area. so 350mm is the total height of the rubber part of the tyre

R15 is the rim size in inches

to get total size of tyre, add rim & rubber heights together. 350mm = ~14".

so your tyre size is ~29". (this is with a bit of rounding off, actual figure collected from atari's link, as he stated, is 28.9")...

hope that helps... :helloo:

Edit: because my description is so good :crazy:

i did a little bit of noobcad on a google image:

You do not have the required permissions to view the files attached to this post.

alien

Joined: Wed Mar 24, 2010 10:30 pm
Posts: 16343
Location: Perth
Vehicle: '92 Sierra, 1.6efi, SPOA, 31s.

Posted: Wed Dec 14, 2011 12:16 pm

as for why ones 185 wide and ones 200 wide on the ground, check your pressures, and don't compare front and rear, cos the fronts got more weight on it. (well, actually it means you might want to lower or raise the pressure on one or the other to balance it out).

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cairns27

Joined: Thu Dec 23, 2010 7:42 pm
Posts: 489
Location: Macleay Island
Vehicle: '95 Vitara JXI LWB G16B

Posted: Wed Dec 14, 2011 5:23 pm

The tyres have the same pressure, are all marked 235/75R15,the trailer spare is 15mm wider than the car spare across the tread

ajsr

az supporter

Joined: Sun Dec 28, 2008 10:30 pm
Posts: 3712
Location: melb

Posted: Wed Dec 14, 2011 6:13 pm

it depends on lots of things like carcuss construction and how the tread base is designed.

some LT tyres have a massively narrower foot print than the actual carcuss width.

just run two tyres of the same brand like you should anyway and its all good

bye

alien

Joined: Wed Mar 24, 2010 10:30 pm
Posts: 16343
Location: Perth
Vehicle: '92 Sierra, 1.6efi, SPOA, 31s.

Posted: Wed Dec 14, 2011 9:30 pm

cairns27 wrote:

The tyres have the same pressure, are all marked 235/75R15,the trailer spare is 15mm wider than the car spare across the tread

as i said, different weights front and rear means the front tyre will bag more on the road giving a wider footprint than the rear.

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BlueSuzy

az supporter

Joined: Sun May 04, 2008 11:30 pm
Posts: 9716
Location: NSW
Vehicle: SJ51 LWB, SJ70 SWB

Posted: Wed Dec 14, 2011 9:52 pm

Different brands make different size tyres. Even though they are the same marked size..

Measure a 35" BFG to a 35" Nankang. The Nankang will be smaller

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BlueSuzy wrote:

I'm over the G16b's.

Gadzuks

Joined: Tue Jul 05, 2011 4:44 am
Posts: 86
Location: Penrith

Posted: Wed Dec 14, 2011 11:19 pm

You might find there is some diffenence between rim widths as well (trailer and car) which can affect the tyre width (and diameter) too.

shabz

az supporter

Joined: Sun May 03, 2009 11:30 pm
Posts: 646
Location: Melbourne

Posted: Thu Dec 15, 2011 6:11 am

cairns27 wrote:

There's a lot about tyres I don't undertand,

I've got shitloads,..235/75R15'

They're foot print is different..185 to 200.wide.?

How is this so ?

bye

The tyres will be 235mm from the side wall bulge to the other sidewall bulge. The width of the "footprint" will be less than that

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