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Author Topic: Tyre size for 18"  (Read 975 times)

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Proz

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Tyre size for 18"
« on: 07 December 2009, 23:13:27 »
Hi
Forgive me if this has been covered before but ... my car has 16" alloys with 225/55/16s just now .... if i want to put on 18" alloys should i go for 45 or 40 profile to keep the speedo accurate ....... also with my 16" at the moment my speedo seems 3-4 mph faster than what my gps says .... ie car says 60mph , gps says 56-57 mph.... which one is the right reading  ..... im confused  :D

Thanks  :y
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The Red Baron

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Re: Tyre size for 18"
« Reply #1 on: 07 December 2009, 23:16:12 »
i think 40. tbh. :y
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Re: Tyre size for 18"
« Reply #2 on: 07 December 2009, 23:21:25 »
Quote
i think 40. tbh. :y

I used one of the convertion things and it said 45 was less than 1% difference to whats on just now ... i think the 40s were -2.4% or round about there but the 40 seems the more common fitting ... so would that mean the speedo would be more out or less ..... i think i need to find some local alloy dealer for some advice  :-/
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Re: Tyre size for 18"
« Reply #3 on: 08 December 2009, 10:47:14 »
35 section tyres for 18" wheels mate  :y
gps always lags behind on the reading  :y
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Re: Tyre size for 18"
« Reply #4 on: 08 December 2009, 10:54:00 »
Quote
35 section tyres for 18" wheels mate  :y
gps always lags behind on the reading  :y
i have 225/40/18. my speed reads 70 but atually doing 67/8. :y if that helps you at all.
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Re: Tyre size for 18"
« Reply #5 on: 08 December 2009, 19:56:55 »
Quote
Quote
35 section tyres for 18" wheels mate  :y
gps always lags behind on the reading  :y
i have 225/40/18. my speed reads 70 but atually doing 67/8. :y if that helps you at all.

Yes that does help ... thanks  :y
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