Can ST175/80R13 Be Used On One Axle and ST185/80D13 Be Used On Other Axle Of 2013 Jayco TT?

Question:

I have 4 ST175/80R 13 on my travel trailer, one needs to be replaced. i found that the spare tire new is a ST185/80D 13. My question is, can I buy another ST185/80D 13 and run on the same axle, front or rear without causing a problem with towing and braking? My axles are Dexter torsion axles.

asked by: Al B

Expert Reply:

It is not recommend to mix tire sizes on a trailer, as it will cause the trailer to sit unevenly and put additional pressure on one axle.

Now in addition your ST175/80R13 tires are radials where the ST185/80D13 are bias ply and these should not be mixed either. These tires have different ply designs and handling characteristics and mixing them on the trailer will cause a very unpleasant and unstable towing experience.

I recommend going ahead and purchasing a ST175/80R13 spare as it is the exact size as your current tires, and is a radial tire so you will have no handling issues. This will avoid any possible issues.

More than likely your trailer uses the 5 on 4-1/2" bolt pattern so if that is the case I recommend the Karrier ST175/80R13 Radial Trailer Tire w/ 13" White Mini Mod Wheel - 5 on 4-1/2 - Load Range D # AM31991 as it has an 81 MPH speed rating and include a 1-year warranty on the wheel and 5-year limited warranty on the tire..

If your trailer has a different bolt pattern just let me know.

I included a video of the # AM31991 for you to take a look at.