Single Screw, where to put new pair of drive tires?

I allways been told new new old old.

 

I'd go with the tire dealer; New New Old Old.
New Old Old New, puts too much weight on the new tires and they'll wear quicker.

 

Either situation is not advisable but I think 2 new together and 2 old together is the lesser of two evils. Mix a new and an old on the same side and the worn tire will start to cup and wear weird.

 

I'd go with Northern Mechanic advice. He and the tire dealer know what they're talking about.

 

Depends on the axle. If it is a Mack axle, I'd recommend putting old-new/new-old. Mack axles aren't "open" like most trucks, and that little bit of difference trying to run new-new/old-old could trash the inner workings of the differential. Now if you're running virtually any other rear axle, you're probably dealing with a true "open" differential, in which case a little variance from one side to the other isn't all that big of a deal and you should run new-new/old-old in order to make the tires last longer.

 

Find a tire dealer that will give you some money for the half worn tires and replace all 4. Problem solved!

 

Yep, all 4 is the way to go. one side taller than the other will also wear the outside of the old tires and the inside of the new ones.

 

Replace all.

 

Replacing all is the best choice but if you're only doing two then put them on the same side.

A worn tire beside a new one is like running with an underinflated tire. It makes the old tire drag.