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Chris B Lifetime member
Joined: 17 Oct 2005 Posts: 3537 Location: Chorley, Lancashire
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Posted: Thu Aug 24, 2006 22:55 Post subject: Tyre Size Calculator |
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Hey up guys... if you are considering changing tyre sizes its worth having a try with this handy tool
http://www.miata.net/garage/tirecalcold.html _________________ Isuzu Rodeo Denver Max LE | 265/65R18 BF Goodrich AT LTM No.60
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Google Sponsor
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Posted: Thu Aug 24, 2006 22:55 Post subject: Google Ads keep this community free to join! |
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mrwookie Lifetime member
Joined: 15 Sep 2005 Posts: 390 Location: banffshire ne jockland
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Posted: Sun Sep 10, 2006 0:19 Post subject: |
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wonder if some of the imports out there have "stock sizes" my speedo reads too fast...have to do 72 on the speedo to be doing a real 60 . Are wheels ,tyres, changed that often _________________ if you can read this you are not drunk enough |
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brains ******
Joined: 18 Aug 2006 Posts: 897
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Posted: Sun Sep 10, 2006 0:57 Post subject: Tyre Size Calculator |
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fantastic m8 that saves me having to work it out for my self thanx and ive added it to my favorites |
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JLB(UK) ****
Joined: 10 Dec 2007 Posts: 348 Location: SW London / Lusaka, Zambia
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Posted: Wed Mar 19, 2008 10:39 Post subject: |
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And this one is rather handy too for calculating optimal rims sizes (scroll down).. also lots of other useful info
http://www.carbibles.com/tyre_bible_pg2.html _________________ 1993 3.2 V6 SWB manual (Zambia)
1999 3.5 V6 LWB Auto (UK)
1999 3.5 V6 LWB Auto (UK) |
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Chris B Lifetime member
Joined: 17 Oct 2005 Posts: 3537 Location: Chorley, Lancashire
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CelticWitch Lifetime member
Joined: 30 Aug 2007 Posts: 157
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Posted: Wed Jul 30, 2008 22:34 Post subject: |
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Does anyone think there would be a problem putting 265/75 R16 tyres on my MK4?
it has 245/70 R16's at the moment but one is getting close to illegal and isn't going to pass the MOT. _________________ Trooper Citation MK4 3.0TD LWB (DOHC) Black.
There's them that can and gets on with it and them that can't and just talks about it! |
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dxmedia *******
Joined: 04 Mar 2007 Posts: 4677 Location: Hope Valley
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Posted: Wed Jul 30, 2008 22:46 Post subject: |
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CelticWitch wrote: |
Does anyone think there would be a problem putting 265/75 R16 tyres on my MK4?
it has 245/70 R16's at the moment but one is getting close to illegal and isn't going to pass the MOT. |
They'll fit on fine with no tinkering at all. _________________ For great insurance deals on 4x4s, imports and more, contact Adrian Flux :
01553 845 945 |
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the flower man *******
Joined: 04 Apr 2007 Posts: 1624 Location: north kent
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Posted: Wed Jul 30, 2008 23:52 Post subject: |
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CelticWitch wrote: |
Does anyone think there would be a problem putting 265/75 R16 tyres on my MK4?
it has 245/70 R16's at the moment but one is getting close to illegal and isn't going to pass the MOT. |
thats the standard tyre size for the mark2/3 and the larget on stock rims of the mark2/3 is the size you have said. 265/75/16 _________________ presumption is the mother of all f**kups |
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Red Oktober Lifetime member
Joined: 04 Nov 2006 Posts: 644 Location: South Devon
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Posted: Thu Jul 31, 2008 10:58 Post subject: |
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This is the tyre calculator that i use .... http://www.1010tires.com/TireSizeCalculator.asp?action=submit&reset=yes _________________ pka muddycarl
2.8TDI
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Red Oktober Lifetime member
Joined: 04 Nov 2006 Posts: 644 Location: South Devon
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chikoroll ****
Joined: 03 Nov 2008 Posts: 446 Location: Brisbane, Australia
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Posted: Wed Feb 17, 2010 11:09 Post subject: |
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for Mark 2/3/4
stock tyre = 245/70r16 = 9.6" x 29.5"
available sizes are:
245/75r16 = 9.6" x 30.5"
265/75r16 = 10.4" x 31.6"
235/85r16 = 9.25" x 31.7"
with a 2" lift (body or suspension)
255/85r16 = 10.0" x 33.1"
285/75r16 = 11.2" x 32.8"
and some maths to consider when choosing your tyres
rubber contact to the road from factory = 74.8" per tyre or 299.52" total contact area
think PSI as in Pressure per Square Inch of road contact, the amount of available pressure is a constant, the spread of it depends on the tyre size
and lets say the trooper weighs in at 2,150kg's with you and stuff in it
245/70r16 = 9.60" x 7.80" x 4 tyres = 74.8" per tyre, 299.52" total contact area = 7.17kg/inch - Stock
245/75r16 = 9.60" x 7.95" x 4 tyres = 76.3" per tyre, 305.28" total contact area = 7.04kg/inch
265/75r16 = 10.4" x 8.00" x 4 tyres = 83.2" per tyre, 332.80" total contact area = 6.46kg/inch
235/85r16 = 9.25" x 8.00" x 4 tyres = 74.0" per tyre, 296.00" total contact area = 7.26kg/inch
255/85r16 = 10.0" x 8.30" x 4 tyres = 83.0" per tyre, 332.00" total contact area = 6.47kg/inch
265/75r16 = 10.4" x 8.30" x 4 tyres = 86.3" per tyre, 345.20" total contact area = 6.22kg/inch
the bigger the contact area = less road Pressure, (floats over surface, can aquaplane easier)
the smaller the contact area = more road pressure (harder on the surface - digs in)
negative effects of the various sizes
wider tyres - floats over the surface, aquaplane easier, frontal/wind resistance, rolling/road resistance, weight/gearing, steering resistance, braking reduced, harsher on mechanicals (tie rods, cv's, etc.), wider turning circle, initial cost
narrow tyres - *beep* all
positive effects of various sizes
wider tyres - can corner faster, increases wheeltrack
narrow tyres - more downforce PSI (better traction), tighter turning circle, less resistance, better fuel economy, better performance, initial cost _________________ 98 Holden Jackaroo LWB, 3.5L Petrol (in Australia)
97 Isuzu Trooper SWB, 3.1T/D (in UK)
94 Isuzu Bighorn LWB, 3.1T/D (UK)
98 Holden Jackaroo LWB, 3.0T/D (Australia)
94 Holden Jackaroo LWB, 3.1T/D (Australia) |
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IronMaidenTrooper Newbie
Joined: 01 Sep 2010 Posts: 3
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Posted: Wed Sep 01, 2010 10:25 Post subject: |
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I slapped on some 33 X 12.5 bf goodrich on my 97 trooper II. i have only experienced slight rub when im doing some craaazy things in the mud. but only when im going fast and bouncing. oh ya i just had to get the proper offset rims i found some beautifull 15 in crome ones localy...... holy *beep* how do you attach a photo on this sight jeeez!!! sorry im new. |
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hooflungdung? *
Joined: 01 Aug 2007 Posts: 10 Location: Mid Wales
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Posted: Wed Dec 01, 2010 14:33 Post subject: 31 x 10.5 x 15 Tyres on an unmodified N Reg Trooper LWB |
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I want to put these tyres pon my wifes truck as I have them in the garage but need to get some 15" Rims - I have 2 questions:
1. Will they fit OK without modding the suspension etc. and not interfere with bodywork and steering gear etc. esp when offroading?
2. What offest do I need to get on the rims to minimise any problems and any suggestions where to get a good but cheap set of suitable steel rims?
Any help much appreciated.
Thanks
Mark |
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kbekl ***
Joined: 09 Nov 2010 Posts: 175 Location: Manchester
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Posted: Wed Dec 01, 2010 15:14 Post subject: Re: 31 x 10.5 x 15 Tyres on an unmodified N Reg Trooper LWB |
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hooflungdung? wrote: |
I want to put these tyres pon my wifes truck as I have them in the garage but need to get some 15" Rims - I have 2 questions:
1. Will they fit OK without modding the suspension etc. and not interfere with bodywork and steering gear etc. esp when offroading?
2. What offest do I need to get on the rims to minimise any problems and any suggestions where to get a good but cheap set of suitable steel rims?
Any help much appreciated.
Thanks
Mark |
tyres will fit fine i have 31's waiting to go on
i think rbuckingham has a set of 15" so might be worth a pm _________________ karl
1995 3.1td auto bighorn |
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reddragondfw **
Joined: 18 Aug 2006 Posts: 77 Location: bridgend s wales
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Posted: Mon Mar 14, 2011 20:45 Post subject: tyre pressure |
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can anyone tell me what the correct tyre pressure is for 235/85/r16 bought this vechicle with all 4 tyres this size but spare is the oringal for trooper citatation _________________
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