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Are 19"x10" Wheels Legal On An R33 Gtr

duff

By duff,
in Exterior & Interior Styling

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duff Collaborator

duff

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im not 100% sure on the size of the stock rim as my gtr came with different wheels. ive got a set of 19x10 with an offset of +18. just thought some one might know off the top of their head if its legal in NSW for a 33 gtr

Bakes Mentor

Bakes

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You are 1 inch wider already with the wheels and the track increase counts on top of that so it will be over for sure. Most cops arent going to check for track so dont worry about it but yes technically they can be defected I would say.

I have 9.5 inch wheels on mine, only 1/2 inch wider than stock but stock offset is +30, new wheels are +12 so that puts mine out also.

scathing Grand Master

scathing

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You are 1 inch wider already with the wheels and the track increase counts on top of that so it will be over for sure.

?

Most cops arent going to check for track

I have a mate who's a cop and when I showed him my wheels the first thing he asked me was what offset they were, to work out if the track was illegal.

so dont worry about it but yes technically they can be defected I would say.

His rim is 1" wider than stock with an offset 12mm lower (stock R33 GT-R wheels are 17x9 +30) so he's legal as long as he gets the tyres with the appropriate circumference. Just. He's on the width increase limit an 1mm below the track increase limit.

duff Collaborator

duff

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thanks guys i just couldn't work out the track with as i don't know much about off set on wheels. the tyres im grabbing are 275/30/19 with will be legal as well i think as they are 14.77mm smaller than standard tyres.

cheers guys.

Bakes Mentor

Bakes

Posted
Posted
His rim is 1" wider than stock with an offset 12mm lower (stock R33 GT-R wheels are 17x9 +30) so he's legal as long as he gets the tyres with the appropriate circumference. Just. He's on the width increase limit an 1mm below the track increase limit.

I stand corrected! You are correct! He is right on the limit with a track increase of 25mm. I found this link:

http://www.1010tires.com/wheeloffsetcalculator.asp

Thanks for that, I thought my set up was illegal also. Just discovered I have 1mm spare to play with, lol. My track increase is 24mm.

scathing Grand Master

scathing

Posted
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thanks guys i just couldn't work out the track with as i don't know much about off set on wheels.

I used to struggle with it as well, until someone pointed out a really simple fact to me.

The width of your wheel has absolutely nothing to do with your track. Only offset matters.

The definition of track is the distance between the centre of your left wheel and the centre of the right. That means the width is irrelevant for determining track.

Offset is the distance between the centre of the wheel barrel, and where the back of the wheel hub is (the part that you push against your brake hub when you're fitting the wheel to the car), usually measured in mm. As this then defines the centre of the wheel relative to where it attaches to your suspension, it does affect your track.

So on the same car, a higher offset reduces the track and a lower offset increases it.

So if you can only increase your track by 25mm (which is the law in every state, I believe), that means the centre of each wheel can only shift outwards by 12.5mm. That means if you have a stock +30 offset, the minimum new offset you can have is technically +17.5. Unless you've got custom made wheels, the chances are you're not going to get an offset with a decimal place so you'll have to settle for +18.

scathing Grand Master

scathing

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Hey dude.

The link you provided to 1010tires doesn't calculate the track increase. Only how much less room you have between the suspension, or the guard lip.

I can't find a quick definition of track for you and my laptop is about to run out of batteries. I'll post one up later.

scathing Grand Master

scathing

Posted
Posted

Have a look at the RTA's Vehicle Standards Index 09 - Guilelines for alternative wheels and tyres

http://www.rta.nsw.gov.au/registration/dow.../vsi09_rev4.pdf

The wheel track is measured from centre line to centre line. It's not the outer edges or inner edges that matter.

If you fit wider wheels you will probably increase wheeltrack and this is usually associated with a change in wheel offset increasing the loads on bearings, axles, suspension joints and steering tie rods.

Emphasis added by me.

scathing Grand Master

scathing

Posted
Posted

Chances are the cops won't notice. It's hard to spot visually. Chances are the sticker on the barrel is covered with brake pad dust, and unless they pop a wheel off they're not going to see what's embossed on the back of the hub.

As long as your wheels aren't sticking out of the guard, you'd have to be very unlucky to get called on it. I'd be more worried about a pod filter :)

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