Originally Posted by
Rick Fischer
Hiyas all
I used Coopers in all since about '88, on all the high country trails, and all the deserts on the continent. They always performed, and always worked in the wet on bitumen. I can only recall a couple of punctures, and these were tradies tek screws! Only bad experience was me pressing my luck trying to extend replacement to Darwin from Canberra. "She'll be right!" Failed at Hells Gate bottom of Gulf on way to Roper River..............not much tread left at all. That wa a me FAIL! not the tyre. Anyway..............!
As to the "Poopers" comments one hears around the place, on investigation one finds that those have been run underinflated at some time prior. Not necessarily at the time of failure! Might have been 6 or 12 months before. Any wall de-lamination, tread failure, or similar can normally be attributed to running underinflated. Underinflation is excessive deflection = excessive heat buildup - damages the ply bonding/vulcanising!
Excessive deflection kills tyres whether on an earthmover, and aircraft or a car. Road vehicle design max deflection limit is 10%.
On my D2 loaded for three months I would possibly running 60psi in the rears for the highway. Fronts normally stay as always. When loads are varied one must do 2psi test on Passenger car tyres, and 4psi test on LTs. Never rely on the vehicle manufacturers' handbook values. Handbook values are set for ride and to provide "safe" understeer............................and in normal "domestic" use will be fine.
Off road going slow deflated and bulged :0) even up to about 80kph on corrugations, just watch/feel the tyre temp.
Only reason I am now on BFGs is that the Cooper distributor won't/doesn't do "sales" on deffie size!..............................and crappy PR!
Cheers all
RF