Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Proz on 07 December 2009, 23:13:27

Title: Tyre size for 18"
Post by: Proz 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

Title: Re: Tyre size for 18"
Post by: The Red Baron on 07 December 2009, 23:16:12

i think 40. tbh. :y

Title: Re: Tyre size for 18"
Post by: Proz 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  :-/

Title: Re: Tyre size for 18"
Post by: tigers_gonads on 08 December 2009, 10:47:14

35 section tyres for 18" wheels mate  :y
gps always lags behind on the reading  :y

Title: Re: Tyre size for 18"
Post by: The Red Baron 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.

Title: Re: Tyre size for 18"
Post by: Proz 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