More tyre questions - bigger diameter on Jackaroo

Savvas, I would contact a Jackaroo Club (not many 'roos in most clubs). There are Clubs for your vehicle in most capital cities. They would give you some hands-on advice.

Savvas, There has been alot of stuff on the overlander forum regarding upgrading sizes and the ADR24, this is in regards to overall diameter, the overall diameter will change by more than 15mm, 28mm according to the BFG guide, needs to be checked with your insurance co., my insurance co. made it quite clear, if the tyres are illegal you will not be insured.

Dean

Savvas, theoretically you are right.. yes the TYRE will stand 14 mm taller, but the VEHICLE GROUND CLEARANCE will only increase by 1/2 that...ie 7 mm, because the axle is in the centre of the tyre radius.
Not a big net vertical gain for the increased rolling diametre the vehicle has to push around.
What is written on the sidewall is not gospel, it varies amongst manufacturers.

You may find this site interesting....
http://www.miata.net/garage/tirecalc.html

cya

I am also looking at BFG ATs for my 99TD Jack. I got prices and talked to my insurer and I could increse tyre size by 1".
This meant that I could only go to the size between 245 and 265 (I think it was a 245/75 instead of 70) which were also about $50 more expensive then either of the other two sizes.
Tim

We put 245/70R16 BFGoodrich A/T tyres on our 98 TD Jackaroo a couple of years ago. They have been good and tough - no punctures at all in many 100s of Ks of outback driving. They do give a very slight increase in clearance, are a bit noisier than the standard on-road tyres the vehicle came with, make no appreciable difference to fuel consumption, but do make the speedo a bit inaccurate (it under-reads the speed you are going by about 5 km when doing an indicated 100 km per hr.)