13" rims . Blew out a tire on my trailer so I thought I would purchase two new tires One of the old tires will upgrade my spare. Looking online I noticed some tires call for a 5" rim. Not sure if mine are 4.5" or 5". Never knew it made a difference but if it does my purchase will be decided on your input. What would be the difference? These are ST 13/175/80 radials.
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