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Can R17 tires be replaced with R18?

2 Answers

PeytonFitz

07/24/25 7:48am

Tire R17 cannot be replaced with R18. Here are the specific details about tires: 1. The R in R17 and R18 represents the diameter (in inches): R stands for the tire's diameter. R18 tires have a larger diameter, so they cannot be interchanged. 2. Tires are round, elastic rubber products mounted on various vehicles or machinery for ground rolling: Tires support the vehicle body, cushion external impacts, ensure contact with the road surface, and maintain the vehicle's driving performance. Tires are often used under complex and harsh conditions, enduring various deformations, loads, forces, and high/low temperatures during operation. Therefore, they must possess high load-bearing, traction, and cushioning performance.

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JudahAnn

08/11/25 3:25am

Switching from R17 to R18 tires requires serious consideration. Having driven many cars, I believe this isn't something to do just for novelty. First, while larger wheels may look cooler, the factory-set dimensions are carefully calibrated. Changing them could cause issues. For instance, bigger rims mean thinner, stiffer tires, leading to a bumpier ride—especially on uneven city roads, making it less comfortable. Additionally, significant size differences can throw off your speedometer accuracy, risking unnoticed speeding on highways—a serious hazard. You must calculate the new wheel and tire's total diameter, ensuring it doesn't exceed the factory-recommended 3% limit, or you might face chassis scraping and reduced braking performance. Safety comes first, so consult a professional or check the manual beforehand. After modification, a wheel alignment is essential to avoid extra costs and headaches. Don't just focus on looks—prioritize long-term usability and daily safety.

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