Can a 175/80R13 Tire be Used as a Spare for a Trailer with 185/80R13 Tires?

Updated 08/07/2025 | Published 07/04/2025

Question:

Hi If I have ST185 80r13 on my trailer will a ST175 80r13 be ok as a spare?

asked by: Michael S

Expert Reply:

Hey Michael, thanks for reaching out!

Yes, and no.

Yes, because you can technically hobble along to the nearest tire shop to get the right size tire. No, because if that tire shop isn't as nearby as you were hoping, then you could really mess up your suspension.

What I recommend doing is picking up the Karrier ST185/80R13 Radial Trailer Tire with 13" Aluminum Wheel - 5 on 4-1/2 # KE33JR as your spare, that way you have a tire that matches exactly so you can safely travel until you're able to get another spare.

Did you find that smaller tire size cheaper than the size you currently have?

expert reply by: Jon G

Jon G.

8/7/2025

Hey Michael, Did you end up getting the Karrier tire as your spare, or did you find another solution? I'm curious to know how it worked out for you so I can help others in a similar situation.