Jump to content
SAU Community

Recommended Posts

is it legal to have different width tyres?

ie, ive got 255/40R17's on the back, and 235/45R17's on the front.

both fit under the wheel arches, etc... but it has been noted down on my work order something about different sized wheels?

cheers..

Link to comment
https://www.sau.com.au/forums/topic/71077-tyre-widths/
Share on other sites

If you look here you will find out :rofl:

http://www.dpi.wa.gov.au/licensing/myvehic...tions/tyre.html

Alternative road wheels are permitted under the following conditions :  

Rim width must not exceed the maximum rim width specified by the manufacturer by more than 25mm (1") (for passenger vehicles manufactured after 1st January 1973, the manufacturers rim width shall be taken as that specified on the tyre placard).  

In any event, rim width shall not exceed 177.8 mm (7") unless specified by the manufacturer as standard equipment for the vehicle in question. No increase in rim width is permitted for vehicles fitted with original equipment rims in excess of 177.8 mm (7") width.  

The wheel is contained completely within the body work of the vehicle which includes acceptable flares.  

The wheel does not foul any part of the body or suspension under all conditions of travel  

The vehicle handling is not impaired in any way.  

The tyre to rim fitment must be in accordance with the Tyre and Rim Association Manual.  

Rim diameters must be the same as specified by the manufacturer.  

The wheel must be one designed for use with the vehicle with respect to bolt pitch circle and wheel nut tapers  

The track must not be increased by more than 25mm (1") over the maximum specified by the manufacturer.etc.  

 

All wheels must be the same size, profile and bolt pattern.  

Vehicles required to comply with Australian Design Rule 24, "Tyre & Rim Selection" must continue to comply with this Design Rule (contact the Department of Transport and Regional Services for more details).  

The fitment of so called "plus one" and "plus two" and tyres is acceptable providing :  

the overall diameter of the large rims fitted with the lower profile tyres do not exceed the overall diameter  

all tyres and rims fitted to the vehicle are of the same size and profile  

with the exemption of item (f), the tyres and rims are in conformity with the requirements specified above in items (a) to (j).  

Reducing the wheel track less than the original manufacturers specification is not permitted, as this may reduce vehicle stability.  

Link to comment
https://www.sau.com.au/forums/topic/71077-tyre-widths/#findComment-1310986
Share on other sites

Yeah! I actually rang licensing and spoke to the "Technical" guy there and he told me it was ok to have bigger on the rear compared to the front as long as the difference between them didn't exceed, I think, 10% or 20%. Might have been 20% :confused: and it had to state it on the placard that it supported those particular sizes. I have 8" on the front 235 and 9" on the rear 255.

So many different answers!! What's the actual fact??

Link to comment
https://www.sau.com.au/forums/topic/71077-tyre-widths/#findComment-1312106
Share on other sites

seeing as i cant see which is legal or not, and different width tyres is on ym work order...

is anyone willing to loan me a set of same size/width rims/tyres early next week, or even just a par of 235/45R17's so i can match them to the fronts?

thats basically all i have left on my work order to complete before it expires on tuesday :D

Link to comment
https://www.sau.com.au/forums/topic/71077-tyre-widths/#findComment-1324948
Share on other sites

Your wheels can only be 2 inches larger and 1 inch wider. If they are larger they are not legal

So when the r33 came out stock wheels where 16inch, largest you are legally allowed to get is 18. This also goes with the Width.

Link to comment
https://www.sau.com.au/forums/topic/71077-tyre-widths/#findComment-1326246
Share on other sites

yeah... ive got 17's on..

and the legalities of width is, you can have up to 7" rims on your car, unless it states larger on your tyre placard, then you may not exceed that,

so my tyre placard says 17" 255's on it, mine are that size...

Link to comment
https://www.sau.com.au/forums/topic/71077-tyre-widths/#findComment-1326257
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Thanks for posting, your engine bay looks tops. I'm fairly sure you posted the wrong video though, I think you were supposed to upload the one from your "private test road" where it's banging off the limiter with the gate open?
    • This is something to be careful of. I did a bit of digging on the NM35, as I spend a lot of time on near brand new cars and CANBus related stuff, which uses the same "OBD2" plug for a fair chunk of making my life easy. The NM35, does NOT support OBD2. The data pin is actually on Pin3, which is a manufacturer specific pin, and requires Consult3 to connect to the NM35. Your low voltage, is either because the NM35 doesn't have 12V to the constant power pin on the J1962 (OBD2) connector, OR, it is attempting the standard comms, (CanBus, K Line, etc) and can't see any voltage on those pins. Some people have had success accessing SOME data from the vehicle on OBD2 specification, using a module that supports KPW. My assumption, like Duncan has stated, it will likely actually be JOBD, where there is some cross over with the OBD2 and JOBD standards. Note, lots of "OBD2" dongles, do NOT support KPW, which is what you need for a lot of Japanese vehicles of this era (And even up until recent years!), EG, Subaru, Suzuki, etc.    The end of this thread is probably worth a read, as some people did find a way to get a display up in the NM35 recently, looks like someone implemented all the stuff needed to make it work. (The right protocols).  
    • Depending on the purpose of the car, and how much more fabbing you want to do, and what clearances you have, you could look to raise the motor, which will raise the front diff up. Likely would mean altering the chassis rails etc etc, hence the more fab work you'd need to do. However, this can create issues, not just in clearance with everything fitting under the bonnet, but you've also raised a LOT of weight up in the car, and this will DEFINITELY alter handling characteristics (But, so will how much weight you've already added to the front end). You'll also have to deal with the fact the gearbox to rear diff is now out of alignment too for the tail shaft, and alter the angle of the diff, or deal with a bit of potential vibration. Raising the motor an inch up, is effectively the same as making the whole car sit higher by not lowering it as far. So one inch higher motor, theoretically means you can drop the car an extra inch lower, and maintain the same angles in the CVs. Again, depends on the purpose of the car. If it's a just cruiser on the street car, maybe won't be an issue. If it's meant to be a time attack car, I can see you not wanting to raise the motor. This is just for you to ponder as an idea.
    • Have you not seen geospy.ai? It can now give GPS co ords to within a metre from a photo, even if it's a random photo you take inside. Supposedly at the moment only the government/law enforcement has access to that... Supposedly...
    • I've got the rear ones, they're certainly beefy. I need to take them to my driveshaft guru to check over, he's very fussy about the quality of components so I'll let you know if they are made of cheese by a blind man.   Are you in Australia? A mate just had a set of EN26 shafts made for his K20 Lotus by our fabricator which were quite cheap (compared to Driveshaft Shop) so if you can procure the CV's and draw what you need he'd make them for ~$800 for the pair.
×
×
  • Create New...