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Ken555
On the Road
Joined: Fri Sep 28, 2007 7:39 pm
Posts: 573
Location: Aberdeenshire
GTM: Cox/Coupe
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 12" on 13" Coupe Anyone had experence of running a 13" Wheeled Coupe on 12" wheels (165x60x12 tyres)
I can get a set off a mini cheap (Remember I'm Scottish  ) and wondered if it was worth it.
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| Thu Dec 13, 2007 8:53 pm |
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gtmdriver
On the Road
Joined: Tue Oct 30, 2007 8:44 am
Posts: 632
Location: Chester le Street
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If you move to 12" wheels it will affect the overall gearing of the car. There is a good calculator here to work out the effect of different tyre and wheel sizes.
http://www.carbibles.com/tyre_bible_pg2.html
Scroll about 1/3 of the way down page 2.
Your speedo will also need re-calibrating.
12" wheels will also limit your tyre choice as they are much less common than they used to be.
12" wheels may also look a little odd as they won't fill the wheel arches in the same way but that's down to personal taste.
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GRP rules!
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| Thu Dec 13, 2007 9:09 pm |
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rooster
GTM delivered
Joined: Mon Nov 05, 2007 7:23 pm
Posts: 46
Location: north east, durham
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my 13" bodied gtm uses the 12" cosmic pentire wheels and they fill the arches quite nicely, but they do use the metro size tyre. the speedo may not need re-caliberating as the rolling radius of the wheels may be the same depending on which tyres you use! hope this is of some help
ps heres a pic of mine just to show you: http://s76.photobucket.com/albums/j18/r ... CF0249.jpg
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| Fri Dec 14, 2007 7:44 pm |
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West
Admin, and Coupe Nutter
Joined: Fri Sep 14, 2007 10:34 pm
Posts: 1769
Location: In the workshop
GTM: Cox/Coupe
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Guess who
Yup i ran 12s on mine when i first got it, 155/70/12, also ran these with my first honda incarnation  Tyre choice is rather limited tho and getting very had to get, unless its mini sizes which do tend to look a little small and still only a couple of choices, in my view, found a pic of my old Coupe wearing 12s and it just doesnt look as nice as my current 13s/tyre combo. which give me a sensible rideheight with my current suspension set up, my car was a little low when it was on 12s
also the car will ride the bumps pot holes of the road alot better if the tyre diameter is bigger
WEST
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IF wile e coyote had a GTM he would have one with Nitrous too! watch out road runner! The First GTM into the 11s then the 10s, PB 10.87 @ 125.5 Mph on A048 tyres, and fully road legal at Santa Pod
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| Fri Dec 14, 2007 10:23 pm |
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nigelsgtm
GTM delivered
Joined: Wed Oct 31, 2007 8:32 pm
Posts: 19
Location: brownhills walsall
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I have to agree with west ,i ran my coupe on 12s and it was to low ,looked pants with a big gap around the wheel arch , im now on sportspack with 175/60/13s on the front and 185/60/13 on the rear and its a lot better alround ,save you money 
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keep it real keep it "A"
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| Sat Dec 15, 2007 7:29 am |
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Allan
GTM delivered
Joined: Wed Nov 07, 2007 3:57 pm
Posts: 26
Location: Wick, Caithness
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Anyone that might be wishing to sell their 12" pentires at any time please let me know. 
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There is always another way
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| Sat Dec 15, 2007 12:07 pm |
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rooster
GTM delivered
Joined: Mon Nov 05, 2007 7:23 pm
Posts: 46
Location: north east, durham
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i have pentires but im afraid they aint for sale, well unless a large amount of cash is waved in fornt of my face lol!
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| Mon Dec 17, 2007 10:21 pm |
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Allan
GTM delivered
Joined: Wed Nov 07, 2007 3:57 pm
Posts: 26
Location: Wick, Caithness
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Quote: large amount of cash Steady on.  I am scottish after all.
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There is always another way
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| Fri Dec 21, 2007 3:12 pm |
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