I have a 2008 Rav4 with 235/55R18 tires. The size of the boot I ordered, a Healink size 15, fitted my spare tire very well and went through with no issues, swearing or frayed joints. After owning the car for 10 years, the New England winters caused the original cover's stitching to fail, causing it to come loose several times during car washes. The change cost me $25. So far I'm happy with the new replacement and hope it lasts a long time.