Enter your Current Tire Width (mm), Aspect Ratio (%), and Rim Diameter (inches), then pick your Winter Tire Strategy and Primary Concern to get your Recommended Winter Tire Size — along with the Overall Diameter Change, Width Change, and New Sidewall Height so you know exactly what's going on your car this season.
Recommended Winter Tire Size
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Overall Diameter Change
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Width Change
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New Sidewall Height
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Narrower tires slice through snow more effectively than wide tires, which tend to 'float' on top. This improves traction and reduces the risk of getting stuck in snow.
Minus sizing means choosing a smaller wheel diameter with a higher sidewall tire. This provides better ride comfort, more air cushioning, and often lower cost while maintaining similar overall diameter.
Generally, you can safely vary the overall diameter by ±3%. Larger changes may affect speedometer accuracy, clearance, and vehicle performance.
Not necessarily. You can use the same wheels if you choose winter tires in the same size as your summer tires, though minus sizing often requires smaller diameter wheels.
Small diameter changes (within ±3%) have minimal impact. Our calculator shows the percentage difference to help you stay within safe limits.
Always use four matching winter tires. Using only two can create handling imbalances and reduce overall safety, especially in turns and during braking.
Look on your tire sidewall for numbers like '225/60R17'. The first number is width (225mm), second is aspect ratio (60%), and the last is rim diameter (17 inches).
Higher aspect ratios (60-70%) are generally better for winter driving as they provide more sidewall flexibility and comfort when driving over snow and ice.