18.5x8.50-8 Trailer tires are wider 8" trailer tires. They are typically found on snowmobile trailers, boat trailers, and other small to mid size trailers. They are used with 8x7" trailer wheels. We mount tires for free! Buy a rim and a tire, we'll send them to you mounted and ready to install! Click here to shop Wheels for the 215/60-8 and 18.5x8.50-8 tires.