Tyre time

Submitted: Friday, May 06, 2005 at 09:49
ThreadID: 22711 Views:2851 Replies:6 FollowUps:5
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G'Day all,
I'm after some advice on tyres for my 120 Prado. I mainly bought the Prado to tow my van, so it does spend most of it's time on road either towing or as day to day transport. Recently I've caught up with some old mates who are getting into more off road stuff, not mountain climbing, but fire trails and the like. I'd like to factor in this use when it comes to making a choise on new tyres.
Question : Would I be better off sticking another set of Grandtreks on, or something a bit more agressive? If so, which brand and type? The only thing that would concern me is excessive road noise.
Any advise?

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Reply By: BenSpoon - Friday, May 06, 2005 at 10:16

Friday, May 06, 2005 at 10:16
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.
AnswerID: 109990

Reply By: Member - Stan (VIC) - Friday, May 06, 2005 at 11:30

Friday, May 06, 2005 at 11:30
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

AnswerID: 110000

Follow Up By: Capt. Wrongway - Friday, May 06, 2005 at 12:47

Friday, May 06, 2005 at 12:47
Is there any "down side" to fitting 70"s instead of 65"s on a standard set-up 120? ( as you can see, I know bugger all about tyre sizes. )
FollowupID: 366595

Follow Up By: Member - Stan (VIC) - Friday, May 06, 2005 at 13:19

Friday, May 06, 2005 at 13:19

The only "down side" is the legal side of things as accorging
to your complience place you can't fit larger tires - possible
problems with insurance, warranty, plus you need a certificate of complience etc... Also your speedo will be out by about 5km/hr.
e.g. speedo 60km/hr - real speed 65km/hr....

Having said that as long as you tell insurance what size tires
you are running there should be no problems and I don't
know anyone who had problems with vicroads by going
from 265/65/R17 to 265/70/R17.

The upside of fitting 70" is that you will get aroud 0.5-1cm more
clearance under the diff, so less chance of hitting/sratching something
while driving offroad...

FollowupID: 366605

Reply By: Member - Paul P (Bris) - Friday, May 06, 2005 at 12:10

Friday, May 06, 2005 at 12:10

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


AnswerID: 110009

Follow Up By: Member - Stan (VIC) - Friday, May 06, 2005 at 12:16

Friday, May 06, 2005 at 12:16
Coopers ATR come in LT construction as well and they
are quiter compared to BFT AT.
FollowupID: 366585

Reply By: Truckster (Vic) - Friday, May 06, 2005 at 12:39

Friday, May 06, 2005 at 12:39
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
AnswerID: 110015

Reply By: Trev88 - Friday, May 06, 2005 at 12:58

Friday, May 06, 2005 at 12:58
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.
AnswerID: 110016

Follow Up By: Capt. Wrongway - Friday, May 06, 2005 at 13:25

Friday, May 06, 2005 at 13:25
G'Day Trev88,
Thanks for your responce. I really do'nt want to change rim sizes as I've already fitted Prado 17" steel rims and Grantreks to my van and trailer, plus two spares, with the aim of keeping all the same. It is a big dission, as I do'nt want to end up with something I'm not happy with, especially if there is increased road noise, as well as the cost. I've just clicked over 65,000km on the Grantreks and they've just about had it, so I'm going to have to make my mind up very soon. I'm not overly impressed with Coopers, only from a few problems that friends have had with them.
( balancing & side wall cracking at 35,000km ) I am swaying towards the Goodyears and am looking for advise on the new GT Radials brand.
Maybe I'm just being too hard to please. I did'nt find buying the bloody 4by this hard.
FollowupID: 366608

Follow Up By: Member - Stan (VIC) - Friday, May 06, 2005 at 13:35

Friday, May 06, 2005 at 13:35
The GoodYear ATR is good tire as well and got the same
strong sidewall as MTRs, althought I am not sure
if it is available in 17" size yet...
FollowupID: 366611

Reply By: DrewT - Friday, May 06, 2005 at 14:35

Friday, May 06, 2005 at 14:35
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
AnswerID: 110032

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