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| tyres http://auszookers.com/forum/viewtopic.php?f=5&t=28627 |
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| Author: | cairns27 [ Wed Dec 14, 2011 8:28 am ] |
| Post subject: | tyres |
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 |
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| Author: | steak_knife [ Wed Dec 14, 2011 9:50 am ] |
| Post subject: | Re: tyres |
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..... 
Oh, what was the question??? |
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| Author: | atari4x4 [ Wed Dec 14, 2011 10:00 am ] |
| Post subject: | Re: tyres |
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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| Author: | Scrawny [ Wed Dec 14, 2011 10:00 am ] |
| Post subject: | Re: tyres |
Is it random, unclear question night tonite? |
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| Author: | steak_knife [ Wed Dec 14, 2011 10:04 am ] |
| Post subject: | Re: tyres |
Scrawn wrote: Is it random, unclear question night tonite?
why??
Is that normal???
Craig..... 
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| Author: | whincup [ Wed Dec 14, 2011 11:31 am ] |
| Post subject: | Re: tyres |
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... 
Edit: because my description is so good  i did a little bit of noobcad on a google image:
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| Author: | alien [ Wed Dec 14, 2011 12:16 pm ] |
| Post subject: | Re: tyres |
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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| Author: | cairns27 [ Wed Dec 14, 2011 5:23 pm ] |
| Post subject: | Re: tyres |
The tyres have the same pressure, are all marked 235/75R15,the trailer spare is 15mm wider than the car spare across the tread |
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| Author: | ajsr [ Wed Dec 14, 2011 6:13 pm ] |
| Post subject: | Re: tyres |
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 |
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| Author: | alien [ Wed Dec 14, 2011 9:30 pm ] |
| Post subject: | Re: tyres |
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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| Author: | BlueSuzy [ Wed Dec 14, 2011 9:52 pm ] |
| Post subject: | Re: tyres |
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 
hi |
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| Author: | Gadzuks [ Wed Dec 14, 2011 11:19 pm ] |
| Post subject: | Re: tyres |
You might find there is some diffenence between rim widths as well (trailer and car) which can affect the tyre width (and diameter) too. |
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| Author: | shabz [ Thu Dec 15, 2011 6:11 am ] |
| Post subject: | Re: tyres |
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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