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Old 12-31-2004, 23:09   #1 (permalink)
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Speedo difference on 18's???

If I fit 18's to my turbo ute, wont the speedo be out due to the different tyre circumference, or can it be changed to suit and tyre size?
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Old 01-01-2005, 00:39   #2 (permalink)
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Re: Speedo difference on 18's???

if it is out with the 18's u can change to suit how u do it i dun know but it can be done
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Old 01-01-2005, 02:14   #3 (permalink)
 
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Re: Speedo difference on 18's???

You don't need to change anything. You can put either 235/40R18 or 245/40R18 tyres and it'll still be legal and your speedo won't be out by a lot anyway. With 235/40R18 it'll be out by 0.3% and with 245/40R18 by 1.5%. You'd be wasting your money.

There's more info on this in the FAQ.
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Old 01-01-2005, 03:59   #4 (permalink)
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Re: Speedo difference on 18's???

My car's computer was set to 18 inch wheels and I had the standard 17 incg wheels fitted, with this combination my speedo read about 10-11% high (verified with my GPS across the nullabor). When I got to Perth I had Ford reset my computer to 17 inch wheels and now it reads about 3-4% high.
If you are going the other way your speedo is likely to read low, be careful of speeding fines or get Ford to reset the wheel setting.
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Old 01-01-2005, 04:03   #5 (permalink)
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Re: Speedo difference on 18's???

Ford can reset the comp to suit what wheels ya got.....
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