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General => Cosmetic and bodywork matters => Topic started by: BigDaveC on 20 July 2006, 18:38

Title: Rim & tyre sizes
Post by: BigDaveC on 20 July 2006, 18:38
If I were to change my 14" with 185/60 to 15" 185/55 would that be equal ??? surely not ?
Title: Re: Rim & tyre sizes
Post by: jv on 20 July 2006, 18:48
185/55/15 would be cool or 195/50/15
Title: Re: Rim & tyre sizes
Post by: BigDaveC on 20 July 2006, 18:55
will those sizes lift the car off the floor a bit, but keep the wheel arch clearence the same ?
Title: Re: Rim & tyre sizes
Post by: jv on 20 July 2006, 19:01
neither should make any difference as the whole point is that the overall size stays the same
Title: Re: Rim & tyre sizes
Post by: BigDaveC on 20 July 2006, 19:20
I've slight scrubbage on the drivers side when i go over speed bumps.
I wondererd weather i could lift the car a bit without changing the springs.
The camber also needs doing since the lowering. Does this affect aswell the height ?
Title: Re: Rim & tyre sizes
Post by: Dizzie on 20 July 2006, 19:22
if you're going 15's you have to run 195/45 rubber... on a 8 inch rim
Title: Re: Rim & tyre sizes
Post by: jv on 20 July 2006, 19:25
So you currently have what, 6 by 14's and they are catching the arches? Something not quite right there
Title: Re: Rim & tyre sizes
Post by: BigDaveC on 20 July 2006, 19:36
no, something catching slightly underneath on the drivers side over speed humps. Arches are fine.
Will the camber adjustment sort that out.
Will bigger wheels sort it ?
Title: Re: Rim & tyre sizes
Post by: Dizzie on 20 July 2006, 20:02
you should be able to see what's catching just by looking.

should always get the geometrey done when you've done anything to the suspension.

as long as the rolling diametre is the same having a different size wheels won't change anything really. may corner slightly different to the change in tyre wall.
Title: Re: Rim & tyre sizes
Post by: BigDaveC on 20 July 2006, 20:10
It's a beam further back that the wishbone arm, just underneath the footwell bit.
I've just been outside and the drivers side is about 1cm or so lower than the passenger side.
I haven't had the alignment / camber done yet. Does this sound like the problem ? or are you able to untighten the top mount suspension bolt on the driverside???
Title: Re: Rim & tyre sizes
Post by: Uruk Hai on 20 July 2006, 21:39
If your going from a 14 to a 15 inch rim the nearest you'll get to keeping the overall rolling radius the same is a 195/50 - 15, or just have a play on this site ?

http://www.miata.net/garage/tirecalcold.html      :wink: