different sized wheels
#1 _uglybob_
Posted 07 October 2006 - 05:33 PM
#2
Posted 07 October 2006 - 06:42 PM
#3 _devilsadvocate_
Posted 07 October 2006 - 08:07 PM
#4 _CHOPPER_
Posted 07 October 2006 - 08:09 PM
#5 _uglybob_
Posted 07 October 2006 - 08:25 PM
#6 _CHOPPER_
Posted 08 October 2006 - 02:16 PM
#7 _ZAK308_
Posted 08 October 2006 - 03:33 PM
I was informed by the WA Dept. of Planning and Infrastruture that all vehicle modification are governed by the national code of practice for light vehicle construciton and modification. There was a link to the document on their website (www.dpi.wa.gov.au).
"Section LS tyres, rims, suspension and steering" states under modifcations without certification that "All rims fitted to a front axle OR a rear axle must be of the same diameter, offset, width and mounting configuration (except for spare wheels used in an emergency situation)".
To me this means that front and rears can be different, as long as the 2 front are the same and the 2 rear are the same.
There is a lot of info in this document dealing with allowable modifications, maximum wheel and tyre sizes, max rim widths and different aspect ratios for front and rear. Its worth a read. If there is no link on the DPI website, try a google search.
#8 _devilsadvocate_
Posted 08 October 2006 - 05:48 PM
At present the focus appears to be on the size of the rims and not the overall diameter of the tyres? .........can achieve the same change in ride height by going to a taller tyre.
#9 _uglybob_
Posted 09 October 2006 - 10:05 PM
cheers again guys
ben
#10
Posted 10 October 2006 - 01:00 PM
1. The over all diameter isn't increased by more than 15mm. This allows for different size rims from front to rear given the tyre profile allows the over all diameter to remain within 15mm.
2. The track measurment isn't increased by more than 26mm (1 inch)
3. The tyre and wheel combination doesn't foul any part of the steering, suspension or body on any of its operation.
A good book to get is the NJOY universal tyre fitment guide. Lots of good info in there..It has most specs on most models.
Hope this helps.
#11 _devilsadvocate_
Posted 10 October 2006 - 02:06 PM
thanks for that ^ ,redslur......15mm change in diameter, is this +/_15mm, can be smaller too, doesnt leave much room for variations, how do they specify the original diameter of the tyre?Wheel and tyre combinations are as simple as:
1. The over all diameter isn't increased by more than 15mm. This allows for different size rims from front to rear given the tyre profile allows the over all diameter to remain within 15mm.
2. The track measurment isn't increased by more than 26mm (1 inch)
3. The tyre and wheel combination doesn't foul any part of the steering, suspension or body on any of its operation.
A good book to get is the NJOY universal tyre fitment guide. Lots of good info in there..It has most specs on most models.
Hope this helps.
Go to a tyre place and for a stock torrie they may fit a set of 185/70/13, 589mm diameter or a 185/75/13 608mm which I believe is close to the original in size, difference = 19mm, is the 185/70/13 illegal?
Edited by devilsadvocate, 10 October 2006 - 02:07 PM.
#12 _revmaniac_
Posted 10 October 2006 - 05:48 PM
#13 _DocDamage_
Posted 10 October 2006 - 05:58 PM
#14 _CHOPPER_
Posted 10 October 2006 - 06:22 PM
devilsadvocate, the regs state that the overall diameter must not be more than 15 mm larger that the largest tyre optioned for that vehicle, model or series. So for an LH - UC, the largest optioned tyre is the DR70H14 ( optioned to the L34 and A9X ) at 625 MM. Therefore you can go to a 640 MM diameter tyre. Anything bigger possibly needs to be certified. Previously, the regs atated if you exceeded that margin, the speedo needed to checked for accuracy.
revmaniac, what a load of crap. I know of at least 30 vehicles that have a smaller profile tyre on the rear from the factory, including the VE HSV barges. Safety reasons, my arse!
#15 _torona kid_
Posted 10 October 2006 - 08:11 PM
(F) 205/40-16 ® 255/40-17
would this be all good and its going to be engineered
#16
Posted 11 October 2006 - 08:26 AM
Generally the allowable increase/decrease is taken from the tyre placard found in the glove box lid. Specific to that vehicle.
A good tyre shop should be able to advise you accordingly. I failed to mention that you can decrease the diameter by up to 26mm.
As far as profile differences go, allowable limit is 10% aspect ratio variation from front to rear. I.e a 45 profile front, 50 profile rear on similar width tyres.
Edited by Redslur, 11 October 2006 - 08:27 AM.
#17 _CHOPPER_
Posted 11 October 2006 - 06:46 PM
Where is that stated?As far as profile differences go, allowable limit is 10% aspect ratio variation from front to rear. I.e a 45 profile front, 50 profile rear on similar width tyres.
#18
Posted 12 October 2006 - 02:44 PM
#19 _CHOPPER_
Posted 12 October 2006 - 07:22 PM
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