SnapRing TireSavers protect your 36" to 39" tires during the off-season from harmful UV rays, dirt, acid rain, and animals. Install by simply sliding the cover over the tire and letting the ring snap together. Includes 2 covers. Lowest Prices for the best rv covers from Covercraft. SnapRing TireSavers Tire Covers - 36" to 39" Diameter - White Vinyl - Qty 2 part number ST7004WH can be ordered online at etrailer.com or call 800-298-8924 for expert service.