Hey guys!
I was told that 225 50's would be suitable for 17's on a magna but after talking to bob jane,they said they werent right.
Does anyone know what tyres would be best?
Thanks.

225/50/17 is the original size, a lot of people put 235/45/17 as they are cheaper & a bit wider.
The original size is the one you want.

I'm running 225/50/R17's, these are the same size as stock VRX wheels.

215/55/17 will fit nicely too.

Not much different OD than the stock 16" or 17" tyres & can be got with a 94 load rating without too much hip pocket pain....

entirely depends on the rim width. a 225/50 17 is ideal for a 7 inch wide rim. 7.5 or 8 inch rim can accept a more common 235/45 17.Saying that, I run a 235/45 17 tyre on 7 inch wide rims with no problems apart from a tiny bit of sidewall bulge

why not go a thinner tyre for the sidewall stretch?

why not go a thinner tyre for the sidewall stretch?

Most people seem to go for the 235 width due to the price & range available..

why not go a thinner tyre for the sidewall stretch?You'd typically do that on 8"+ rims and the narrower tyres will have too low a load rating.

Do all Magna's have the same size tyres?

My stock size is 215/60/16 according to my tyre placard. JJ, What's yours?

The 225/50/17 should have an overall diameter of 656.8mm, which is 7.6mm smaller than my stock tyre (664.4mm) and that is within the +/- 15mm that the RTA regs allow for.

So if your factory wheel tyre is same as mine, then yes 225/50/17 is a good match.

One issue might be that tyre manufacturers don't make that size tyre, or simply the dealers don't stock it.
So a different size might be recommended.

235/45/17 has a diameter of 643.3mm which is TOO SMALL for my car and a defect if found fitted, not to mention probable cop out for insurance companies.
235/50/17 has a diameter of 666.8mm which is just 2.4mm more than my factory size and that's perfect.


Hope this helps too.
Oggy.

Oggy, Ralliart/VR-X s2/GTV/GTV-i came with 17's as standard in a 7" wide rim. All had tyre dimensions from factory of 225/50 R17. A 235/45 R17 is indeed outside the allowable dimensions but every tyre shop I have been to won't bat an eyelid to fitting it. I had an argument with a tyre dude at bob Jane when he tried fitting them to my dads commodore and told him it was not allowed according to the RTA. He ended up looking in his special book and I was correct. In all the times I have been stopped by police or insurers have had it they have not said a thing about my tyres

Do all Magna's have the same size tyres?

My stock size is 215/60/16 according to my tyre placard. JJ, What's yours?All 3rd gens either had 205/65R15s, 215/60R16s or 225/50R17s.

Basic rim/tyre rules in NSW:
You can go one inch wider in rim than the tyre placard displays as widest optional rim. Non VRX/Sport/Ralliart Magnas are 6" rim. So you can go up to 7". Widest legal fitting to 7" rim is 225. Yes, physically you can ram anything in to a 7" rim, but it ain't legal!
I have 225/50/17 and it is ok and legal. Just very hard to find those sizes and they tend to cost bit too.... And don't forget the Load Rates either!
Tyre shops sell and install. That's all. You as the owner need to know the Laws.

Killer, where does it say putting over 225mm wide rubber on a 7" rim is illegal.
I've read through the RTA regs and never noticed any rules about what rubber fits on what rim.

Each tyre has a min and max rim width fitting. Go on line and check some of the manufacturers websites like yokohama, dunlop, bridgestone, goodyear (I'm pretty sure yoko has a comprehensive table). 235/45R17 fits min 7.5" wide rims whereas 235/50R17 can go down to 7" due to the extra sidewall height.

I understand that there are recommendations, but where is it written in any legal sense?

AFAIK, there is no law stating that you cannot put (for example) a 255mm wide tyres on a 6.5" rim, but if there is a law/regulation about it, I'd like to know for the sake of the knowledge.

My understanding is this:

Widest legal fitting to 7" rim is 225. Yes, physically you can ram anything in to a 7" rim, but it ain't legal!
should be fixed to this:

Widest recommended fitting to 7" rim is 225. Yes, physically you can ram anything in to a 7" rim, but it ain't recommended!

Cheers,
Graham.

RTA law uses the word "fit". That doesn't mean physical ability to ram any tyre to any rim but follows the tyre industry safety regulations. Unfortunately I don't have such file to post but have seen certain pages and even some tyre shops refer to it.
Also, one can only widen the tyre it self by (from memory) 25 mm. So, 205 + 25 = 230 mm. Closest legal to that is then 225, not 235.
You could always just keep using 235s on 7" rim and wait what insurance inspector says at time of a claim. But then it might be too late of course....
And yes, check some of those tyre sites, not many except Michelin allow 235 on to a 7" rim.



Killer, where does it say putting over 225mm wide rubber on a 7" rim is illegal.
I've read through the RTA regs and never noticed any rules about what rubber fits on what rim.

of course you are all talking about legal modifications *without an engineer's certificate* right?

because you can get an engineer to sign off on rims up to 9.5" wide and tyres that are 245/40r18...

RTA law uses the word "fit". That doesn't mean physical ability to ram any tyre to any rim but follows the tyre industry safety regulations. Unfortunately I don't have such file to post but have seen certain pages and even some tyre shops refer to it.
Also, one can only widen the tyre it self by (from memory) 25 mm. So, 205 + 25 = 230 mm. Closest legal to that is then 225, not 235.
You could always just keep using 235s on 7" rim and wait what insurance inspector says at time of a claim. But then it might be too late of course....
And yes, check some of those tyre sites, not many except Michelin allow 235 on to a 7" rim.

I'm pretty sure my old mans Hilux has 255's on a 7" rim. They actually put 265's on the same rim too. But because of the higher profile, ie; 70, it's supposed to be ok.

I'm pretty sure my old mans Hilux has 255's on a 7" rim. They actually put 265's on the same rim too. But because of the higher profile, ie; 70, it's supposed to be ok.


As I previously mentioned, it depends on sidewall height. Higher sidewall allows fitment to wider wheels due to extra stretchability. So 235/50R17 is perfectly ok on a 17x7" wheel but 235/45R17 is not.

RTA law uses the word "fit". That doesn't mean physical ability to ram any tyre to any rim but follows the tyre industry safety regulations. Unfortunately I don't have such file to post but have seen certain pages and even some tyre shops refer to it.
Also, one can only widen the tyre it self by (from memory) 25 mm. So, 205 + 25 = 230 mm. Closest legal to that is then 225, not 235.
You could always just keep using 235s on 7" rim and wait what insurance inspector says at time of a claim. But then it might be too late of course....
And yes, check some of those tyre sites, not many except Michelin allow 235 on to a 7" rim.

Please, go read this: http://rta.nsw.gov.au/registration/downloads/vsi/vsi09_rev4.pdf
As hosted at this page: http://rta.nsw.gov.au/registration/downloads/vsi/vsi_dl1.html

1) There is no limit to the increase in width of the tyre.
The stupid part about the rules is that they limit the change in RIM width that you can make, but there is no restriction on tyre width other than, as you said, that the tyre fits and "It is still the responsibility of the vehicle owner to ensure the vehicle remains safe even if modified within the limits."

2) Wookie, for cars weighing over 1201kg, the REAR wheels can be up to 2" greater than "the widest optional
wheel available for the axle assembly used". This may be debatable that the widest optional wheel is on the TMR/Ralliart vehicles, so 2" over that (10"?) or just 2" above what is written on the tyre placard = 8" in my case.

However, there's some big drawbacks. "The front wheels shall be : No wider than the maximum permitted for rear wheels on your vehicle or 204mm (8 inches)."
And regardless of an engineer, FWD vehicles can only go 1" greater than the manufacturer's optional wheel widths on the vehicle.

AWD vehicles max wheel width is 8" unless the manufacturer specifies larger and then that is the max width.


And on tyres, this one is a killer that I didn't know about until tonight.
"If the wheels are listed on your car’s tyre placard or in the owners handbook then the tyres you fit must be those listed on the placard or in the handbook for these wheels."

My tyre placard says just one thing: 215/60/16 on 16x6"JJ rims. So while I've got the factory rims on, I MUST run 215/60/16 tyres! That sucks, I'm definitely changing rims now just so I can run a different tyre.

So Killer's right that the tyre shop can tell you what tyres fit on what rim width for your car, but not all of them know what's legal, so please double check measurements with some simple maths and reading the linked rules above.
Each state's rules are easily available on-line, so no one that can use this forum should be ignorant of the legalities of their modifications.

Please, go read this: http://rta.nsw.gov.au/registration/downloads/vsi/vsi09_rev4.pdf
As hosted at this page: http://rta.nsw.gov.au/registration/downloads/vsi/vsi_dl1.html

1) There is no limit to the increase in width of the tyre.
The stupid part about the rules is that they limit the change in RIM width that you can make, but there is no restriction on tyre width other than, as you said, that the tyre fits and "It is still the responsibility of the vehicle owner to ensure the vehicle remains safe even if modified within the limits."

2) Wookie, for cars weighing over 1201kg, the REAR wheels can be up to 2" greater than "the widest optional
wheel available for the axle assembly used". This may be debatable that the widest optional wheel is on the TMR/Ralliart vehicles, so 2" over that (10"?) or just 2" above what is written on the tyre placard = 8" in my case.

However, there's some big drawbacks. "The front wheels shall be : No wider than the maximum permitted for rear wheels on your vehicle or 204mm (8 inches)."
And regardless of an engineer, FWD vehicles can only go 1" greater than the manufacturer's optional wheel widths on the vehicle.

AWD vehicles max wheel width is 8" unless the manufacturer specifies larger and then that is the max width.


And on tyres, this one is a killer that I didn't know about until tonight.
"If the wheels are listed on your car’s tyre placard or in the owners handbook then the tyres you fit must be those listed on the placard or in the handbook for these wheels."

My tyre placard says just one thing: 215/60/16 on 16x6"JJ rims. So while I've got the factory rims on, I MUST run 215/60/16 tyres! That sucks, I'm definitely changing rims now just so I can run a different tyre.

So Killer's right that the tyre shop can tell you what tyres fit on what rim width for your car, but not all of them know what's legal, so please double check measurements with some simple maths and reading the linked rules above.
Each state's rules are easily available on-line, so no one that can use this forum should be ignorant of the legalities of their modifications.

Just something to add that no one else has said yet. The track cannot be changed by more than 25mm which means the offset cannot be changed by more than 12.5mm. This will determine to some extent what sort of wheel and tyre combination you can fit together with the rule that the tread of a tyre cannot protrude beyond the guard (note not the sidewall bit but the actual tread bit).

Not to mention discrepancies in actual tyre dimensions between manufacturers

Is anyone able to clarify 100% which rim size is used in terms of a legal up-size.

Is it: 1) what the actual tyre placard on the vehicle says, or
2) is it considered to be the biggest rim available across that model range.


case in point my TH executive has the tyre placard listing 15" rim so a legal 2" increase means 17" max,
however a VRX has 17" as a factory fitment, so 2" increase means 19" should be ok.

If it is the tyre placard on the actual vehicle, is there any way around this?
legally of course.

Get a VRX badge and placard and stick them on your car, then go to 19"s. Might work. lol

Is anyone able to clarify 100% which rim size is used in terms of a legal up-size.

Is it: 1) what the actual tyre placard on the vehicle says, or
2) is it considered to be the biggest rim available across that model range.


case in point my TH executive has the tyre placard listing 15" rim so a legal 2" increase means 17" max,
however a VRX has 17" as a factory fitment, so 2" increase means 19" should be ok.

If it is the tyre placard on the actual vehicle, is there any way around this?
legally of course.

the 2" bigger rule (in terms of diameter) is redundant.

the rule is now based on Outside Diameter.

As Oggy and wookiee have said, the +2" rule is redundant, and it goes entirely by rolling diameter (+/-15mm in NSW). You can go as large a diameter you want as long as the overall rolling diameter stays within that +/-15mm. There's restrictions on going smaller (so that you can still place your jack under the car if you get a flat) but why you'd do that is beyond me lol

Do NOT swap tyre placards. It's illegal to remove one I believe and definitely illegal to replace with a different one

1) It's based on your tyre placard. I believe you could get an engineer to OK a wheel size change based on the VRX or Ralliart provided they believe the suspension between yours and the other are the same. But a police officer doing an inspection will give you a defect if your rims are over 1" wider than what is mentioned on the placard unless you have an engineers certificate (or he's not feeling nasty).

You can put 19" rims on your TH or even bigger, just make sure the width is only 1" wider than what is on your tyre placard, or get an engineers certificate.

suspension/control arms between models with 16" and 17" is different. Mitsubishi changed the geometry of the upper rear control arm to give further clearance from the inside-top of the tyre