Larger Tyres

James,
My understanding of the rules in most states are that it is quite okay to go up one tyre size above the manufacturer's largest recommended size. I am guessing thae cruiser would come out with 265/75R16 in which case the 285/75R16 would be okay.
You are lucky in that your vehicle has ample power & torque to cater for this size increase. I was thinking of putting that size on my 4.2T/D Patrol, but with it's gearing being higher than the cruiser, I would really have been working the drive-train too hard in my opinion.
Other things to consider are, more stress on wheel bearings and braking capacity could be slightly affected. Also, your speedo will be out about 5% (you'll be doing around 105k/h when your speedo shows 100), so watch out for the double-bubble-trouble.
Cheers,
Roachie

Gidday James. Do an archive search and you'll find all you need on this topic.

In short, while Roachie is not technically correct, he still comes up with basically the right answer.

You may fit a wheel/tyre combo that is not more than 15 mm larger in overall diameter than the largest wheel/tyre combo specified on the vehicle's trye placard. Find the tyre placard, select the largest combo then come back here and I can give the exact maximum diameter you can fit (which may be satisfied by a variety of width/profile/rim combinations).

Cheers.

Hi James
I am not sure about 100 series, but on my 80 series TD I run BFG A/T 285/75R16 and it has been awesome. Better ground clearance etc. Engine runs at a lower rev on long trips & fuel economy is not adversely affected either way.
Andrew(Dozer) & a few other guys also uses that or bigger on their 80s. Hopefully you could get a reply from them. Read somewhere that the Yokos are pretty good and BFGs are crap. Mine is still rather newist to comment about wear so pay to do a search on which brand. As for state/insurance, you will have to look it up properly. :)
Cheers

James,

I am in SA and am buying a 120 series Prado. I want some bush capable boots on it and am replacing the original equipment highway biased Dunlop Grand Trek AT20's.

I went to my Tyre Dealer and there was a big printed poster on the wall put out by Cooper Tires (note american spelling) that suggested the one alternative tyre available for my vehicle in that brand. Cooper A/T.

The original Dunlops are 265/65R17. Mathematically they have an overall diameter of 776.3mm (265mm x 0.65 plus 17 x 25.4). The Cooper A/Ts are 265/70R17 and have an outer diameter of 802mm. This is a 26mm increase. The tyre dealer, who seemed unaware of the 15mm maximum increase when asked, said "haven't heard of a problem with these, we fit them all the time".

I went to the Toyota dealer that afternoon to ask about this issue and lo and behold there was a 120 GXL Prado ready for delivery to a customer with DEALER FITTED Copper A/T 265/70R17s. I ask "Any legal issues with these tyres?" Dealer says "none that we know of".

So much for the 15mm maximum increase under National ADRs.

Steven

James

Hope this is not too late to help - been going back a bit on the threads. We covered the same ground on post 11692 - have come to the view it is not on for us.

B & J