I put my second spare on just after Arkaroola some years ago on the way to the Simpson because it was easier to get to. It was a General Grabber AT tyre and it went on the left rear when all the other tyres were the original Wranglers with highway tread. All tyres were the same size so I thought that was just fine. I drove 4,000km with it on and changed it over when I got home. At that point I realised that the AT tyre with the same size designation actually had a noticeably larger diameter due to he much deeper tread. No errors were recorded and 30,000km later there are no ill effects. I would say the car seems to be able to handle it but at others say for control on the road it is probably not good practice.
The Wranglers BTW were fine in the desert but got chewed up pretty well on the gibber plains there and back. They were replaced with KO2's on new 18 inch Compomotives not long after that trip.
Mike
MY14 TDV6, ARB Bar, Fyrlyt's, 18" Compomotove Rims. 265/60/18 BFG KO2's, Front Runner roof rack, removable rear false floor.
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