Plus-sizing refers to increasing your wheel diameter while adjusting the tire size to maintain approximately the same overall tire diameter. Moving from 17-inch to 18-inch or 19-inch wheels with correspondingly lower-profile tires is one of the most popular aftermarket modifications. When done correctly, plus-sizing can improve your vehicle's appearance and handling. When done incorrectly, it can compromise ride quality, damage components, and create safety issues.
The primary benefit of plus-sizing is improved handling response. Larger wheels accommodate wider tires with shorter sidewalls, and shorter sidewalls flex less during cornering. This translates to sharper turn-in, more precise steering feel, and reduced body roll. The visual improvement is also significant since larger wheels fill out wheel wells and give vehicles a more aggressive stance. Many automakers offer factory plus-size options on sport trims for exactly these reasons, so the concept is well-established and supported.
However, the trade-offs are real. Lower-profile tires have less sidewall cushion to absorb road imperfections, resulting in a firmer ride and more road noise. They're also more susceptible to damage from potholes and curb strikes because there's less rubber protecting the wheel. Larger wheels are heavier, which increases unsprung mass and can negatively affect ride quality and acceleration. You may also experience reduced winter traction because narrower, taller tires generally cut through snow better than wide, low-profile tires. And let's not overlook cost: larger tires and wheels are more expensive to purchase and replace.
The golden rule of plus-sizing is maintaining overall tire diameter within three percent of the original. If your stock setup is 215/60R16, which has an overall diameter of about 26.2 inches, a plus-one size of 225/50R17 maintains nearly the same diameter at about 25.9 inches. Going to 225/45R18 for a plus-two keeps things close at about 25.9 inches as well. Straying too far from the original diameter affects speedometer accuracy, ABS and traction control calibration, and can cause clearance issues with suspension components and fender wells. Online tire size calculators make this math easy and are essential tools before purchasing.
When plus-sizing, stick with reputable tire brands that offer proven performance in your desired size. Brands like Michelin, Continental, Bridgestone, and Pirelli invest heavily in developing tires for popular plus-size applications. Avoid the temptation to buy cheap tires to offset the cost of expensive wheels, as low-quality tires on premium wheels is a poor combination. Ship.Tires makes it easy to find every available tire option in your desired plus-size fitment, and you can compare reviews and specifications to ensure you're getting the right balance of looks, performance, and value for your specific vehicle and driving needs.