Tyre time

I had a bad run shredding grandtreks- The sidewalls were the cause of each and every failure- they are just too thin and soft.. I'd recommend going for a more balanced on/offroad tyre- one still that is quiet and well behaved on road, but has a slightly more agressive tread pattern. Something similar to the wrangler ATR or RTS maybe.

If you don't wan't to go up is size as most AT tires are 265/70/R17 instead
of 265/65/R17 as Grandtrecks then the best choice would be
Cooper ATR tires in 265/65/R17 size

Stan

Bazza

I would suggest going to a Light Truck spec tyre (LT) They will give you stronger side walls/construction. As stated you will go from a 65 aspect to a 70 aspect ratio with the 17 inch wheels. How aggressive the tread pattern is a matter of choice/use.

I use BFG AT's on my Nissan and have used them on a v6 four runner. These tyres perform well on road with tread pattern suitable for fire trails/state forrest tracks and dirt roads. Downside a little more road noise and harshness due to stiffer side walls and more aggressive tread pattern.

My thoughts

Regards

Paul

Since this exact question gets asked dozen times a day, have a look through a few pages, or try searching the site, you will have plenty of reading

Gday Capt

Im just going through the process myself and my findings so far are.

Coopers are releasing / realeased some at's in 17in that are around high $300's each.

BFG have a good tyre in the AT but not light truck but still good side wall strength.

The alturnative is to go down to 16in rims and put a tyre on with the same rolling diamiter as the Grand trek. That way you also end up with a much wider choice of tyre. But to do this you need to grind back the manufacture lugs on the brakes (toyota can do this for you) Toyota rims or AM ROH. (run a search on the threads and there is a link to the site for instructions on how to grind them back if you are a DIY type.)

Goodyear have a more agreesive pattern in the grand trek range in 17in but it is still a sillicon base and soft (only 40,000km on a set) and still $370 odd a tyre.

I am about 30k km off replacing mine so I would be interested in what you decide on and any feed back after a trip or two under your belt.

I fitted the Cooper AT LT 265/70/17's to my Prado about 20K ago. Didn't go for the ST's at the time because i was worried about the road noise on a car that spends the vast majority of its time ontroad

Very happy with the AT's. Absolutely no extra noise on bitumen & have performed ok off-road too (trips to Alice Springs area, Pedirka desert, Oodnadatta track, Vic high country etc)

I actually thought the 70 profile was a bonus with the extra 13.25mm ground clearance it gave me. Not really worried about having to remember that the speedo is slightly out