Re: largest tire for rear spare carrier?
My wheels are 17x10 Mazzi Hulks with negative 12 offset. Tires are Wrangler MT/R's 13.50 and they fit fine on my carrier. Looks like it was made for it. I can't say for sure with 15.50's but with offset on the wheel you should be fine but like I said can't say for sure.
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