New Tyres - What size?
Submitted: Monday, Sep 20, 2004 at 14:25
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Member - Alan S (NSW)
Good afternoon,
The tyres on my Landcruiser DX have come to the end of their life and its time for a change, I have bought some 16x8 rims and am about to order some tyres but am unsure about what size to order. At the moment I have 7.50R 16 6PR fitted on split rims.
The tyre sizes I am considering are 265/75 or 275/75 Coopers AT's. I don't want to go any bigger than that because the % difference with the speedo will be too much.
I have had a look at the
tyre size calculator http://www.miata.net/garage/tirecalc.html
but it is off little use to as I don't know what 7.50R 16 6PR relates to.
Any words of inspiration out there? Thanks, Alan.
PS. Just become a member, great site
Reply By: Truckster (Vic) - Monday, Sep 20, 2004 at 14:32
Monday, Sep 20, 2004 at 14:32
http://www.rebelsunlimited.com/html/xacm0014.shtml
7.50 x 16 = 32 1/4" , but read on.
Remember that all brands of different sized tires can be different sizes too...
Some may be
EG 32.3, some 33, some 33.8 ACTUAL inches... So this throws your speed out too.
Remember you can only go 15mm from Original to be legal if thats an issue. if not go 275/75's.. And go ST's!
AnswerID:
77129
Follow Up By: Member - Alan S (NSW) - Monday, Sep 20, 2004 at 14:40
Monday, Sep 20, 2004 at 14:40
Thanks for that, I didn't realsie that tyres could go to 85, I thought 80 was the max!
I hadn't considered the legal issue as the GXL Landcruisers etc all run much wider tyres. Do the legal issues relate to each model or would one standrad apply to all landcruisers????
FollowupID:
336781
Follow Up By: Truckster (Vic) - Monday, Sep 20, 2004 at 15:02
Monday, Sep 20, 2004 at 15:02
You would be best contacting RTA, or www.lcool.org might know nSW rules now.
If yours comes with the cheeze cutters, to go wider you need to get it engineered. Which should be cheap and simple since that same model comes with wide tire pack.
Good luck!
FollowupID:
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Reply By: Member - Alan S (NSW) - Monday, Sep 20, 2004 at 17:07
Monday, Sep 20, 2004 at 17:07
Hi Truckster,
Thanks for highlighting that issue to me. Being new to this country I didn't realise how regulated everything was. Since posting my original post I have found out that if I don't get the modification certificated by an engineer then the vehicle will be illegal which may make my insurance null and void.
The cheapest way to get a cert seems to be if I can prove that the tyre change won't affect the speedo by more than a few percent then it should just be a rubber stamp job. I have looked up the web sites recommended on the web that do the calculation for you but how do I prove it myself?
According to the calculator on
http://www.miata.net/garage/tirecalc.html a change from 7.50R 16 6PR (i.e. 225 85 R 16) to 265/75 R 16 has only a 1.9% but how do I prove this?
Thanks,
Alan.
AnswerID:
77149