Tyre Question
Submitted: Wednesday, Dec 03, 2003 at 22:03
ThreadID:
8948
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P.C.
I have done a search of the archives but have found nothing to set my mind at rest.My situation is this,I have just purchased a '94 GQ patrol DX 4.2D,it has a two inch lift and a brand new set of Bridgestone Dueler A/T Lt 285/75R 16 tyres,is this set up legal in N.S.W.? It also has extractors,GIO refused to insure it when I informed them of this(been with them 25 years,never made a claim),AAMI were happy to cover me with with up to four modifications,I listed tyres as one of the mods but just told him they were "biger" he seemed happy with this,could this come back and bite me on the arse?
Reply By: Member - Rohan K - Wednesday, Dec 10, 2003 at 13:47
Wednesday, Dec 10, 2003 at 13:47
P.C. there is plenty on this topic in these archives - I've written a bunch of it. Also over on Overlander
Forum you'll find a thread dedicated to this.
In short, look at your tyre placard and decide which is the largest diameter tyre it allows you to fit. Calculate the standard diameter (tyre width x profile x 2) plus rim in millimetres. For example (245 x .70 x 2) + 16 x (25.4) = 749.4 mm diameter. In this equation the .70 is the profile (read the other threads for an explanation if interested).
Once you've worked out the std, add 3%, e.g 749.4 x 1.03 = 771.9
Now add the 15 mmm allowed in NSW without an engineer's cert and you get a maximum allowable diameter of 787 mm.
Now, go find out what actual diameter your Duelers are and you'll have your answer.
The 2" lift is legal.
Truckster is right - tell the insurers everything.
AAMI are pretty good for 4x4 insurance (there is also 1 or 2 threads on that in here too). You'll find they don't consider tyres a mod, just an accessory. The lift and the extractors are mods so you have 2 left.
Smile, you're on ExplorOz
Rohan (
Sydney - on the QLD side of the Harbour
Bridge)
AnswerID:
39851
Follow Up By: Member - Rohan K - Thursday, Dec 11, 2003 at 16:21
Thursday, Dec 11, 2003 at 16:21
Oh, a couple of other things to bear in mind:
1) A wider tyre with the same profile, will also have a larger diameter and,
2) You may not exceed a 26 mm increase in width without an engineer's certificate.Smile, you're on ExplorOz
Rohan (
Sydney - on the QLD side of the Harbour
Bridge)
FollowupID:
257595