The size tires the 2015 Toyota Highlander has is p245/60r18. This part will need to be replaced eventually. You should change Your tires every 30,000 to 50,000 miles or so. You don't want to get into any wrecks on the road. Making sure Your tires are in the best condition is key to not crashing. You will come into problems with this part at some time or another. You could run into feathering issues. You could face cupping problems. Premature tire wear is something You could face. The part might become loose at some point. Make sure to inspect the tire pressure once a month. Check for holes, in case You run over something sharp.
The 2015 Toyota Highlander comes with two different tire sizes based on the trim package and engine option. The Highlander LE, LE V6, XLE V6, and LE Plus V6 come with P245/60R18 standard; while the Highlander Limited V6 and Limited Platinum V6 come with P245/55R19 standard.
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