Always best to have the same size...if run for any length of time you run the risk of damage... I bought a used "Super Swamper" for my spare...cost me $10.00...not alot of tread left on it and it doest match the make of my other tires..buts its covered by a cover and it WILL get me out of trouble..!! When I replace my current tires I will replace that spare with one of the best ones I take off..
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