'Blocks' throwing off tyres??

Compound too hard, gets cold and brittle maybe?? Rips off on rocks, rear more susceptible because driven more than front unless in 4wd??

As you could imagine Signman , a number of factors contribute to this including the rubber compound, its shape and depth.

Tyres in your picture are generally better than average.

But basically its caused by wheelspin and the stress of the
tyre tread when it deaccelerate as the wheel hits a rock edge.

Wheel articulation is a primary cause , and lowering tyre
pressure improves this.

Cars with leaf springs suffer more from it for the same reason.

Using 4wd as much as possible and using diff locks also reduces it.

hey, you didn't mention what brand they were.....why's that? ;-)

Andrew

Look like BF's a/t's to me ?? That seems to be very excessive to me. I did 50k on mine on the old lux and they copped a hard time,rocks,shale,beach work, Vic high country, pressures up and down to suit, did a lot of off road Id say 30% of the 50k and didnt look like the ones in the picture. I reckon I would have got another 50 out of them only I sold it.I did have a few where the lugs were cut and gouged. I have fitted the same to the prado as I had such a good run with them on the hilux. So far havnt done nearly as much rough stuff with the prado so time will tell. I hope they dont end up like yours. Regards Steve M

Ref ThreadID: 35262 - I had a similar issue with some Dick Cepek FCIIs.

Relevant facts were.
Vic High Country rocky terrain
Tyres were 3+ years old with about 80,000-90,000ks on them
Low Tyre Pressures (18-20psi) on the day I lost blocks on all 4 tyres.
Air Lockers in.
Done the same tracks before without the same damage.

Only difference this time was lower pressures & age/wear of tyres.

Rears lose more blocks & sustain more cuts because they are usually more heavily loaded particually climbing steep hills when the weight is transfered to the back. We see a similar wear out central Oz with overloaded vehicles too.
Over or under inflated tyres seem to increase the damage at times as well.
Cheers Craig...........

G'day Signman
Had exactly the same thing with a set of another brand of tyres a few years ago. That was due to the hard compound. As they proved to be unsuitable for my purposes the dealer replaced them with something else.
It would certainly not be related to rocks being flung from front to rear - would take a lot more force than that to rip the lugs off.
Mine were worse on back also - due to the weight being on the rear when ascending rugged terrain.
Are you able to get a refund/exchange?
Cheers from the Moose

Just face facts Dave, your old bus was struggling most of the time to keep up with us on those rocky and steep hills Ha Ha Ha.

Jokes aside David, you looked at my tyres at Talbotville and saw similar wear and chopping, some of those stones were pretty sharp down in Vic. plus I took a months wear off mine towing Bert up that hill.

Bite the bullet Dave, and get out of that Tojo mate.
Colin

Signman,

I had much the same problem as you.
While I was at the Queanbeyan 4WD show I spoke to the rep from the brand of tyres that I used and he said it has a lot to do with tyre pressure.
If the tyres are too hard they will not grip, combined with the Troopie suspension not as supple as most vehicles and the low down grunt that the Troopie has, something has to give.

You are pushing 3t up a rocky outcrop that is hard to walk over let alone drive a vehicle. When the tyres do get grip the vehicle is not going to leap forward like some light weight 4WD. Something has to give.

Better a tyre lug is broken away than the teeth in the gear box.

I will be down in the Vic High Country again next week. I am going to air down a bit more and see if there is any difference in tyre wear. I have a new set of STT so any damage will be from the VHC. I will let you know how I got on when I return next week.

Wayne

In my opinion 28 is too high. You need to be down to 18-22. I do a lot of High Country trips on 285/75/16 STT's at 18 and have never had a problem. No lockers though. You need to have flexable tyers that roll over the rocks and not force against them - OMO! - it works for me.

David.