Maximum legal tyre size -Landcruiser 100 series

Submitted: Wednesday, Jul 23, 2003 at 03:33
ThreadID: 6120 Views:26812 Replies:2 FollowUps:0
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I've been researching tyres to put on my Cruiser and am more confused now than when I started. Seems to me that the tyre sales people are prepared to let me put anything I ask for on it but what I want to be sure about is that I'm not gonna dud my insurance.

I've got a set of OE GXL rims on it and presently run Dunlop Grand Trek A/Ts [275/70R16]. When I purchased the vehicle it was fitted with the OE Rims and Dunlop Roadgrippers [LT235/85R16]. The tyre placard inside the drivers door lists the tyre spec's as LT235/85R16 108/104N

The owners manual lists both sizes above as being standard for the vehicle. [as I listed in the first paragraph]

I live in WA and think that I am allowed to increase the overall diameter of the tyre by 15mm maximum. [Although I'm not sure that is correct it is my understanding at this time. I stand to be corrected if that is not the case ]

I want to put Cooper AT or ST's on or BFG AT's but what I want to know is what is the maximum size that I can legally put on the thing. I want to go to 285/75-16's just to get a little bit higher off the ground.

Anyone help me with some sort of authoritive answer?

Dept for Planning and Infrastructure [RTA equivalent in WA]not much help as it depends on who answers the phone as to whether or not they even understand what I mean. 3 calls and 3 different answers.

Dave
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Reply By: Steve L - Wednesday, Jul 23, 2003 at 08:43

Wednesday, Jul 23, 2003 at 08:43
Dave,

You can go to 265/76R16 - these will give you a slight increase in clearance, but with a slightly narrower tyre. Diameter of 275/70 is 791.4mm, 265/75 is 803.9mm - this gives a 12.5mm diameter increase (less than 15mm) and thus 6.25mm clearance increase.

The 285/75R16's are more than the 15mm increase allowed - if you go that route you'll need an engineers certificate. Otherwise you'll be running them illegally and you'll also void your insurance.

Steve
AnswerID: 25664

Reply By: Member - DOZER- Wednesday, Jul 23, 2003 at 09:50

Wednesday, Jul 23, 2003 at 09:50
Hi Dave
You must own a std 105, if your placard is 235x85x16.
Other models of your 105 come with 275x75x16(GXL)
the 235 is 32 inches diameter, so is the 275x75.
A 285x75x16 is closer to 33 inches, 255x86x16 is 33 and a third inches and only in mud terrain pattern.
I believe because the gxl 105 had 16x8 rims, you can run them and put on the 275x75x16. If you are worried about the placard, go to toyota and buy a gxl one. That then makes it legal both ways:-)
This was allowed to be done on the 80 series, so why not the 105
Andrewwheredayathinkwer mike?
AnswerID: 25670

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