SA Legal Height/ Rim changes

**punkture** · 03-06-2010, 11:45 AM

Okay i have an ST185R GT4, i looked around the standard rim size was 15" and 215/50/R15 tyres on them, the old owner has now put 18" rims on there, was wondering, with the new law change, from memory 15mm>/< maximum overall diameter, in sa, how do we work this out, is this total rolling diameter with tyre, i.e lower profile higher rim vs high profile low rim? (215/15" vs 205/18" etc)?? rims and tyres im lost at, any help appreciated =)

**madmont** · 03-06-2010, 02:20 PM

you could always use a tyre size calculator
http://www.miata.net/garage/tirecalc.html

**punkture** · 03-06-2010, 05:04 PM

yeah sussed one out already, but if the 15mm is the case, then the lowest i.e 16" is ~30mm increase..??

**greenmac80** · 03-06-2010, 05:13 PM

nah your allowed 2 inches bigger on the wheel.
if you want bigger then you can get em engineered and that costs $400.
as for legal heights ring regency and ask as the new laws have 'eyebrow heights'
so its specific for each car.

**punkture** · 03-06-2010, 06:05 PM

ah i thought transport sa etc changed it to this new rule:

http://www.evotuned.com/forums/index...owtopic=418886

okay so it seems the 15mm is rolling diamater

**chaserbuddy** · 03-06-2010, 07:40 PM

yes thats right they did, The outer diameter of the wheel has to remain within 15mm of the factory specifications. I know this because i got pulled over with 18's on my cressida and I was only allowed 17s if the +2 rule was still in, the cop told me all about it. Only good thing that came from my defect lol.