Wolfspire
Hi,
Does anyone know what the legal tire / rim width for a 1990 mr2 sw20 is? Im running the stock 14"s (195 front and 205 rear) and I'm hoping to upgrade into some 17s going 205/40/17 front and 235/40/17 rear and Ive been struggling to figure out if the rears are legal, i know its a trivial question. i want to keep the tires/rims legal for the build I'm doing on the car.
Cheers

Depends what state you are in. Normally they work on a total rolling diameter up to / no more than 5-8% increase. So 17" 40 profile should be ok, but best check with local road transport compliance dept.

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Apart from rim/tire width and rolling diameter, another thing to check is the load carrying numbers of the replacement tyres, and compare that to the numbers on your doorpost sticker.
The numbers should not be less.

im located in QLD,
The sticker you were talking about Reddtarga that's this sticker here that ive linked right? still a newb when it comes to rims and tires i do apologize.
 
 

Carmikey

Depends what state you are in. Normally they work on a total rolling diameter up to / no more than 5-8% increase. So 17" 40 profile should be ok, but best check with local road transport compliance dept.

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Will do Carmikey my plan for the build for the car is to keep it all legal and by the book

Wolfspire
im located in QLD,
The sticker you were talking about Reddtarga that's this sticker here that ive linked right? still a newb when it comes to rims and tires i do apologize.
 
 

 

Correct, although your car appears to be a JDM with several tire options listed.
The 'H' figure relates to the tire speed rating.
 
FWIW the sticker on my ADM SW20 lists only one set of sizes:
Front 195/60 R14  load 85V
Rear 205/60 R14 load 88V
The 'V' speed rating is apparently higher than a 'H' rating
 
 

So ReddTarga if the speed rating which is H is higher that should be ok? if im wrong please do correct me!

Wolfspire
So ReddTarga if the speed rating which is H is higher that should be ok? if im wrong please do correct me!

Yes, and it is probably the sort of thing that would be checked if you were getting a roadworthy.
But if you want to learn more about tire speed ratings, Google is your friend.

Will do Reddtarga cheers for the guidance

I went through the tyre size exercise two years ago, upgrading from the standard 14" wheels. 17s are the first size that now really has performance tyres, and the Kumho I got were one of the few that that you could get in both the front and rear sizes. 
The 215/40/17 work quite well. The rear 235/40/17 is needed for the load rating. With either 225/45/17 or 245/35/17 there isn't enough air inside the tyre to get the load rating without going to XL tyres (stiffer sidewalls and heavier).
From memory the diameter rule was something like no more than 15 mm and then 3%. With 235/40/17 compared to 205/60/14 you need the 3% bit to stay within the legal maximum diameter. The speedo will run low. 
A wheel offset of +38 mm has been recommended. My new MCA coilovers have allowed a bit more clearance under the guards with my +38 front and +36 mm rear wheels.  

FYI I have a pair of 255x40x17 Kumho street legal semi slicks for sale. These will fit nicely on the rear assuming that you have lipped guards. They have lots of tread left. $100 for a pair.
I'm in Sydney.