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Tyre Sizes - Rough Guide Thread

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31 May 2016 20:39 #167797 by Busta

i run 225/75/15 bfg a/t , no mods at all , fit fine , no rubbing etc


Don't think they make them in that size. Sure they aren't 215/75/15?

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31 May 2016 21:12 #167800 by mag
Replied by mag on topic Tyre Sizes - Rough Guide Thread
standard steel wheels , not sure on size !!

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31 May 2016 21:57 #167804 by Daniel30

i run 225/75/15 bfg a/t , no mods at all , fit fine , no rubbing etc


Don't think they make them in that size. Sure they aren't 215/75/15?



I think Gus has some in that size on his fat boy wheels ;)

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01 Jun 2016 21:08 #167836 by mag
Replied by mag on topic Tyre Sizes - Rough Guide Thread
just checked , they are 225/75/15 on standard steel rims

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01 Jun 2016 21:43 #167838 by Busta

just checked , they are 225/75/15 on standard steel rims


Cool. I sit corrected! They don't do that size anymore though.

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26 Jul 2016 20:02 #170588 by mlines
Thanks to Bosanek a tyre Wiki page is appearing in the BigJImny Wiki

Many thanks to him for contributing

Martin

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses

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16 Sep 2016 07:25 #172383 by KavishKoomar
Just a little query guys about Tyre pressure for a 215/75R15 A/T ... how much do you recon??
Also, bearing in mind Jimny's are really bouncy...

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16 Sep 2016 10:30 #172394 by Lambert
All tyres will have a maximum weight at a given pressure written on the side. Your vin tag will have maximum weight of each axle. Using mathematics you can get the correct pressure for the imposed load on each tyre. Alternatively you can do the chalk test where you put a line of chalk across the width of the tyre and drive froward gently to see how much chalk is left on the tyre.

Temeraire (2018 quasar grey automatic)

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21 Sep 2016 05:04 #172632 by KavishKoomar

All tyres will have a maximum weight at a given pressure written on the side. Your vin tag will have maximum weight of each axle. Using mathematics you can get the correct pressure for the imposed load on each tyre. Alternatively you can do the chalk test where you put a line of chalk across the width of the tyre and drive froward gently to see how much chalk is left on the tyre.


Yeah but the tag is for the standard tyre size... But I recon the chalk test might be a good option.

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21 Sep 2016 05:27 #172633 by Lambert
No. The vin tag gives the maximum permitted mass on each axle, regardless of what else you do to it be that different tyres or anything else.

Temeraire (2018 quasar grey automatic)

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18 Oct 2016 14:59 #173707 by Bosanek
Regarding the question about the correct pressure when using larger tyres, I have some contribution:

As far as I know, generally the larger the tyre is (on a same vehicle), less air pressure is needed for the same effect.

Reasons: the tyre itself is larger (stronger), the contact surface with the ground is larger, and more air is inside anyway (larger internal tyre capacity).

Theoretically, the pressure should be reduced by the same percentage by which the internal capacity of the tyre has increased (the goal is to have the same amount of air inside as with the stock tyres). Since the tyre is similar to a torus (geometrical shape), you'll need some good geometrical math skills to do an exact equation.

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18 Oct 2016 15:02 - 18 Oct 2016 15:03 #173708 by Bosanek
Regarding various tyre sizes (the point of this entire thread),

I made a comprehensive table of all "interesting" tyre sizes for Jimnys.
The table contains mathematical calculations, as well as various data and comments.
The table can also be used for Samurais.

Here is the published table:
docs.google.com/spreadsheets/d/1qwxmEIQ9...ml?gid=0&single=true

I included the link to this table in my article in BigJimniy wiki:
www.bigjimny.com/mediawiki/index.php/Imp...ain_use#1._Tyre_size

I compiled the table to the best of my knowledge and assumptions.
I invite everyone to contribute to fill the missing pieces in that table, or to correct existing ones.
Last edit: 18 Oct 2016 15:03 by Bosanek.

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