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bwessale's avatar
bwessale
Explorer
Feb 03, 2017

Mixed Tire PSIs

I have a double-axle trailer and replaced the rear axle tires. I now have Carlisle RH on the front axle and Carlisle HD on the rear axle. The RH has a recommended pressure of 65 PSI and the HD has a recommended pressure of 90 PSI.

Should I run the two sets of tires at their recommended pressure, or should I run the rear tires at 65 PSI to match the front tires?

My concern is that if the back tires have 90 PSI and the front tires have 65 PSI, won't the back tires end up carrying 30%-50% more load than the front tires?

And if they do, does that matter?

I called Carlisle tire, and they recommended running each set of tires at their recommended PSI until I make the permanent fix and replace the front axles RHs with HDs.

Thanks,

Bill
  • ScottG wrote:
    donn0128 wrote:
    No matter what IMHO you asking for trouble. Before towing at hiway speeds you really need all 4 tires the same size/rating.


    X2.
    One good panic brake and your going to be all over the road.


    Why, what would cause it to do that?
  • Having similar (identical) tires is of course by far the best.

    Increasing the pressure in the back tires will not make them carry more weight, at least not appreciably more. The suspension of the trailer is what determines how much weight falls on each axle, not the tire pressure. The only ways that the tire pressure would affect things is by slightly changing the diameter of the tires (and hence slightly altering the geometry of the suspension system) and by affecting how the tires react to dynamic loads.
  • Welcome to the Forum....your first post.
    Others above are giving you good advice. This is not a good idea.
  • donn0128 wrote:
    No matter what IMHO you asking for trouble. Before towing at hiway speeds you really need all 4 tires the same size/rating.


    X2.
    One good panic brake and your going to be all over the road.
  • No matter what IMHO you asking for trouble. Before towing at hiway speeds you really need all 4 tires the same size/rating.

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