can i have 18's on front and 19's on rear?

[RARASV8]

just curious as i found


VIC
The Law Of Victoria

"The width of any replacement rim must not be:

---- More than 25mm greater than the widest wheel specified by the vehicle manufacturer for that model or vehicle series; or

---- Less than the width of the narrowest rim specified by the vehicle manufacturer for that model or vehicle series

The overall width of any replacement rim and tyre must not be:

---- More than 15mm greater than the largest diameter tyre specified by the vehicle's manufacturer for the model or series; or

---- More than 15mm less than the smallest diamter tyre specified by the vehicles manufacturer for the model or series."



so can i have a 235 x 18 on the front and 245 x 19 on the rear?
just thinking of ways to look different.

i have a VY SV8 that was standard with 235/45/17

Garry

[GMMAD]

AFAIK they have to have same diameter rims F&R

[spanks]

I think you can run 18 front and 19 rear.

[CSP]

Nope - illegal to run different rims front and rear unless the car came from the factory like that.

[VX2VESS]

better not use the spare then lol...

i can't see why not, with the right sized profile tyres they can have the same rolling diameter. only diff would be a variation in handling with different profiles.

[CSP]

better not use the spare then lol...

Spare comes from the manufacturer so it's OK.

[iamhappy46]

Australian Design Rules specify that a vehicle may be fitted with different diameter rims on the front and rear, as long as they obey the other laws relating to rolling diamater, rim width and wheel track. The only car not allowed to have different diamter wheels are FWD's.

If it was illegal, think about the number of people using 19's on the front and cheap 17's on the back...

[VX2VESS]

If it was illegal, think about the number of people using 19's on the front and cheap 17's on the back...

yep all the hoons, lol...

[CSP]

If it was illegal, think about the number of people using 19's on the front and cheap 17's on the back...

Which is illegal and people will be defected for. Have seen it happen (here in the ACT). A friend of mine had damaged two of the rims on her VS and put some chasers on the rear until she could get two new rims.

She was slapped with a defect notice.

[Blown 540]

Which is illegal and people will be defected for. Have seen it happen (here in the ACT). A friend of mine had damaged two of the rims on her VS and put some chasers on the rear until she could get two new rims.

She was slapped with a defect notice.


Thats a bit tough if she had a genuine excuse.:confused:

[iamhappy46]

http://www.rta.nsw.gov.au/registration/downloads/vsi/vsi_06_-_guidelines_for_light_vehicle_modifications_nov_20 07.pdf
^^ This one refers to this one:
http://www.rta.nsw.gov.au/registration/downloads/vsi/vsi09_rev4.pdf

It does not prohibt using different diamter wheels as long as rolling diame is within limits. Also check the ADR ruling on suitable wheels.

I would be interested to hear what offence she committed with the VS, cause it sure as hell did not make it defective. The Police if they are unusre often write defects so that the mechanic has to make the decision and it gets you off the road easier.

Also, having two spare tyres on the car is different to having two 19s and two 17s or even two 18's and two 19's.

[stumps57L]

i got a defect for having stadard 15's on the rear of my vq and 17's on the front. The offest caused the 17's to rub with an excessive load ( had to take whole family + luggage to airport got done the next day before i changed the tyres back. The tread on all tyres were 100%. I told him i had a blowout and didnt want to wreck the lsd with different size tyres. But he gave it to me because a white commodore did a burnout out the front of his house and he didnt know who so he was stickering them all.

Defect come straight off with an excelently maintained car i feel for those who werent.

[CSP]

Thats a bit tough if she had a genuine excuse.:confused:

Yup - but just because there's a good reason doesn't mean it's OK :(

[Brandonsdad]

Nope - illegal to run different rims front and rear unless the car came from the factory like that.

So is it illegal or not? Youre saying it is but is it just your opinion of whether it should be?

A couple of others seem to have found something that states otherwise.

I dont know whether it would be a good look or not. Probably hardly noticable with only 1 inch difference.

[iloveholden]

If its legal or not i dont really see the point in it just put 19's or 18s all round :confused:

[RARASV8]

so have we come up with any real outcome?

iloveholden
Re: can i have 18's on front and 19's on rear?
If its legal or not i dont really see the point in it just put 19's or 18s all round
the reason being i want it to be different with bigger dish on the rear than the front!!

Garry

[CSP]

the reason being i want it to be different with bigger dish on the rear than the front!!

:confused: errrr... Dish has nothing to do with diameter! :confused:

[VYSHSV8]

:confused: errrr... Dish has nothing to do with diameter! :confused:

But it does have something to do with wheel track....ie incorrect offset can cause exsessv loading on wheel bearings and cause them to collapse or shit themselves...

[iamhappy46]

Bigger diameter wheels also allow you to run more dish as the spokes can curve over a larger radius without hitting your brakes.

[Daves ss]

i know with the factory wheels on a chrysler crossfire are different size wheels. Thy are either 19's on the front and 20's on the rear, or 18's on the front and 19's on the rear. So i guess what ur doing should be O.K

[iloveholden]

so have we come up with any real outcome?

iloveholden
Re: can i have 18's on front and 19's on rear?
If its legal or not i dont really see the point in it just put 19's or 18s all round
the reason being i want it to be different with bigger dish on the rear than the front!!

Garry

Far enough but i've seen some wheels with "fat packs" that have lots more dish at the rear than the front and there the same size rim?

[seldo]

has anyone considered the implications for the ABS? A different rolling diameter front to rear I think will confuse the ABS...

[phillbreeze]

It definately affects the ABS.
I've got 225x45x20 on the front and 295x45x20 on the back, which gives the back a much bigger rolling diameter.
After I drive for a about a km. the ABS light comes on and ABS stops working

[crusty maloo]

I had different size front and rear tyres and wheels and had to change to the same size as insurance company wouldn't insure me, so check your insurance company before you do change.

[RARASV8]

thanks guys! some interesting points coming up. and as iamhappy46 said that was the main reason of going for bigger rims on the back.
iloveholden: more info on the "FAT PACKS":bow:
crusty maloo: good point and i will look into that aswell..
not in a real hurray but just looking for ideas and info...

Garry

[LS1-5.7]

Go the same size all round as it saves dramas and will allow you to rotate tyres front to rear to share the wear ;)

[VYSHSV8]

has anyone considered the implications for the ABS? A different rolling diameter front to rear I think will confuse the ABS...

Yes it does mate 275/40/18 on the rear 255/35/18 on the front comes up with abs fault....ie different rolling radius it will let you have a percentage difference but not that great but as long as you can get the rolling diametre pretty close it should be ok

[Phonic]

Thats right, you just have to compensate for the inch difference in rim diameter with carefully selection of tyre size.