Put New Tyres On the Sprayrig...

G'day Willem, I quite agree. My operating conditions may be a bit
different, but I was advised that lowering pressure would decrease
impact damage..it is rubbish. That is exactly what the tyre dealer
who advised 50psi said to me. The comfort factor may be true..
the Hilux rides like a dray with that pressure & uprated springs,but
a tyre a week was too hard to take. cheers...oldbaz.

Well olbaz, I too have 20 years of spray rigs in all conditions, and i dont think you can compare the same as driving a 4wd on tracks.
I think the speed factor plays a very big part, at 15k you are not going to fracture a tyre like hitting a rock at 70 k plus.
Personally i will continue to use lower pressures on my 4by for track work, and mid range pressures on my sprayrigs, as the only tyre problems i have seem to be crap on the gravel roads inviting themselves into my tyres..

Cheers Pesty

Hey Pesty, pleased to hear of another sprayer out there. I wasnt
comparing spraying to general track work although the really
rough slow stuff is very similar. I had no damage at 40psi on the
likes of the Ood, Tanami, Mereenie, GRR etc. Interestingly every
one I stopped for with tyre problems was running lower than I was, about 5 vehicles I think. Anyway I'll stick with it as it seems to
work for me. cheers...oldbaz.

Hi GN, while I am convinced my theory on pressures is right for me in my operations I dont say it is right for all conditions. But after
running 40 psi in the outback without incident I will continue to do
so until comvinced otherwise. You are wise to use your own
experience I reckon rather than blindly following the sheep.
cheers..oldbaz. ps..I was expecting a bigger "spray" than I got !!
No pun intended...:))).

Hi Olbaz

actualy i read on a post once that the correct psi can be determined by checking the pressure difference from cod to hot and i think from memory if it is 6psi or more then the tyres are under inflated.

I think that seems to make good sense and stops you over inflating but also under inflating which i think leads to issues due to too much side wall flexing and heat biuld up.

Regards
GN

Hi Oldbaz,
I have read a few threads were travellers let there tyres down to travel on rough roads.I have always kept my pressures high (42fr/46r & 42trailer)I have done 6 trips to the cape and a trip to Stuarts Stoney Desert to name just a few with no tyre issues.I have always used good quality tyres and used there recommended tyre pressures for the load I am carrying at the time.
Cheers Guy

Hello Motherhen, Strange you should raise the tyre age issue,
another theory I dont subscribe to. I still use original splits on the
Hilux over summer when it takes on a fire unit capacity & the
Roadgrippers date from 1988...not a lot of tread on them but
they perform fine & show no signs of deterioration. I just fitted two brand new Michelins to one of my Peugeots, both were original unused spares off my 405s, cars made in 1994. Tyres
perform perfectly & no sign of ageing. I think there is a lot of luck involved with tyres & many theories on what is right & wrong. I
follow my own experience & will stick with high pressure as long
as it works for me. I did a test on my Jack at 30psi & again at
40psi, the fuel difference was about 15%. Add that to a 30%
gain if you stay under 100kph & the savings are huge. I've put
the Peugeots up to 35psi for 10% better economy & no sign
of abnormal tyre wear. 405s now do 16k to a Litre if held under 100kph, not bad for 2L autos & as good as most diesel cars.
An issue there will always be opposing ideas on, I guess, as long as
you're happy with your choice...happy travelling.....oldbaz.