ok i just need to know if i can put a 225/45/17 on a enkei ralliart rim, i was told i could but then rang another tyre place and they said the only ones i can put on are a 225/50/17 or 235/50/17? can i use a 225/45/17 legally on my car?

they will fit (that's what I ran at the track this week). but even though they'll be legal, they might be a bit small. your speedo will be out (further) by the % of difference.

544.3mm - OD of 225/50r17
533.05mm - OD of 225/45r17

so you'll be ~11mm (or about 2% smaller) in Outside Diameter (RTA pdf on wheel/tyres regs (http://www.rta.nsw.gov.au/registration/downloads/vsi/vsi09_rev4.pdf)).

cheers,
.wook

EDIT: I don't think you can run 235s on 7" rims. I might be wrong.

235 hell no :doubt: not a 7" rim, far too wide.

I use 225/45/17's and they fit just fine. 225/50/17's are a difficult profile to get. Your speedo will read 2% higher than your actual speed (so at 100Kph indicated, you are doing 98Kph)

Probably a good thing if you tend to speed a lot :doubt:

225/45r17's only have a 91 load index. Magna's leagally need a 94 load index. You can get some extra load tyres that would be ok but I wouldn't think they would be common.

235 hell no :doubt: not a 7" rim, far too wide.

im running 235 wide rubbr on a 17X7 rim and its not too wide at all. its wide but nothing wrong with it. gives it a tiny bit extra wall for rim protection also

im running 235 wide rubbr on a 17X7 rim and its not too wide at all. its wide but nothing wrong with it. gives it a tiny bit extra wall for rim protection also

Same I got 235/45/17 I had maxxis and now got the perilli dragons on my car no problem at all you can't notice the difference.

i have 225's on my 17x7s. they are fine. my mate had 235's on the exact same rims (standard r34 skyline rims) and they fit fine. i had 225's on my 16x6.5 r33 rims and they were ok too. i'm pretty sure they were even on the factory nissan tyre placard as an option size.

For awd owners, be careful not to go more than a 225 wide tyre, it could end in tears unlike FWD's.

For awd owners, be careful not to go more than a 225 wide tyre, it could end in tears unlike FWD's.


tell me bout it got 235/40/18s on my awd they rub like a mofo on full lock on the body

so the ralliart rims are only 7inchs wide? the other tyre shop said you cant put a 225/45/17 on a 7 inch tyre only a 7.5inch? im so confused :confused:

so the ralliart rims are only 7inchs wide? the other tyre shop said you cant put a 225/45/17 on a 7 inch tyre only a 7.5inch? im so confused :confused:

it has to do with the profile of the tyre, i know a 235/45/17 on a 7" rim is illegal and dangerous. ask to see there tyre and rim association book, it will tell u if a 225/45/17 is legal on a 7" rim or not.

I have tyres on my wheels also.

I have tyres on my wheels also.

congrats

225/50/17's are a difficult profile to get. Your speedo will read 2% higher than your actual speed (so at 100Kph indicated, you are doing 98Kph)

Really? 225/50/17s are standard fitment on my VR-X, as indicated on the place card. I would have assumed that they wouldn't screw up the speedo since they're a factory fitment :confused:

im running 235 wide rubbr on a 17X7 rim and its not too wide at all. its wide but nothing wrong with it. gives it a tiny bit extra wall for rim protection also

So am I.

however, last time I said so on these forums, I got flamed.

i think this thread is going no where like every other thread that has been about tyre size.

235/45 x 17s on a 7 inch rim is not correct: according to the spec in the rim and tyre guide. The guide is in state and territory motor vehicle registration regulations. Guide is the word.

I'd like to see the ADR safety specifications for non-standard tyre rim combos, to see if they affect the safe handling of any motor vehicle. ADRs are about vehicle safety.

20" x 8" rims on 245/20 or 30 profile rubber, on a vehicle designed for 16" rims and 210 width tyres... cannot be set up according to the manufacturers and the ADR requirement. Too-wide rubber makes it easier for a car to aquaplane, and having increased contact with the road, influence handling/braking and affect the dampers/shockies ability to function correctly. And when the springs are much reduced in height, and stiffened up... the amount of wheel travel is severley reduced. Meaning major changes to how a car handles mid-corner bumps and off-camber roads.

But OK, an extra 10mm width of rubber is illegal.

Go figure.

235s aren't supposed to go on 7" rims but having said 9/10 tyre shops sell and fit them, the other 1/10 will give you a weird look since they didn't know in the first place.

I'm on the 235 offenders list for the record.

the main problem with fitting wider tyres to skinnier rims is that you get more roll when you corner. when you turn into a corner with a wide tyre on a skinny rim the tyre flexes, so there is body roll. a skiiny tyre on a wide rim is stretched onto the rim so there is no flex in the sidewall, so when you turn into a corner the response of the car is much faster.

How exactly does one determine the width of a tyre... 235 45 R17 doesn't indicate to me anything regarding width, can someone enlighten me?

How exactly does one determine the width of a tyre... 235 45 R17 doesn't indicate to me anything regarding width, can someone enlighten me?

the first number is the width (in mm) of the tyre tread

the next number is the sidewall height represented as a ratio or percentage of the tyre tread width

the last number is the rim size (diameter) in inches :nuts:

cheers,
.wook

yeah so as wookie said 235 means 235mm wide. 45 means the sidewall height is 45% of 235, and 17 means it suits a 17" mag

Sorry to threadjack..but whilst on topic i should ask something. I've recently put 225/50 R16's on mine, to replace the factory 185/75 R14's. I haven't thought about the speedo tho. Could it be out? If so, by how much and how can I calculate all this?

the first number is the width (in mm) of the tyre tread

the next number is the sidewall height represented as a ratio or percentage of the tyre tread width

the last number is the rim size (diameter) in inches :nuts:

cheers,
.wook
Thanks for clearing that up Wook.

Sorry to threadjack..but whilst on topic i should ask something. I've recently put 225/50 R16's on mine, to replace the factory 185/75 R14's. I haven't thought about the speedo tho. Could it be out? If so, by how much and how can I calculate all this?
Oh its out alright....reads a whopping 0.3% too high. ie. speedo says 100km/h but your only doing 99.7km/h. Better get that fixed :P

the first number is the width (in mm) of the tyre tread

the next number is the sidewall height represented as a ratio or percentage of the tyre tread width

the last number is the rim size (diameter) in inches :nuts:

cheers,
.wook

And what about the load rating, any info?

And what about the load rating, any info?

Check this out http://www.bridgestone.com.au/tyres/products/car/dimensionsearch.asp

click the question marks, Load = how much weight it can support (Per tyre I'd think, someone better informed should confirm), Letter = speed, how fast it can go with out imploding.

Check this out http://www.bridgestone.com.au/tyres/products/car/dimensionsearch.asp

click the question marks, Load = how much weight it can support (Per tyre I'd think, someone better informed should confirm), Letter = speed, how fast it can go with out imploding.
And now that we're on the topic of load rating, it's the thing you'll get defected on, rather than the width. Magnas seem to have an excessively high load rating (higher than both falcon and commodore despite being the lightest), so worry about that before you worry about 235's being on a 7 inch rim.

Sorry to threadjack..but whilst on topic i should ask something. I've recently put 225/50 R16's on mine, to replace the factory 185/75 R14's. I haven't thought about the speedo tho. Could it be out? If so, by how much and how can I calculate all this?

Easy way to check is drive along with a GPS unit showing the current speed, and compare to your dash reading. That's how I worked out how much my Barina speedo was out after dealer swapped the stock wheels for alloys. Mine was 10%! :shock:

And now that we're on the topic of load rating, it's the thing you'll get defected on, rather than the width. Magnas seem to have an excessively high load rating (higher than both falcon and commodore despite being the lightest), so worry about that before you worry about 235's being on a 7 inch rim.
Would their high load rating have anything to do with it being FWD? Since the front of the car is the business end, so at the front it could be heavier than a commodore/falcon, but overall lighter. I donno how it could work with the AWD though.