Enter your Original Tire Width, Profile, Wheel Diameter, Width, and Offset (ET), then plug in your New Tire Width, Profile, and Wheel Diameter to see your Speedometer Error, how much your Ride Height shifts, and whether your new setup's Overall Diameter actually fits your wheel wells before you buy.
Speedometer Error
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Original Overall Diameter
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New Overall Diameter
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Diameter Difference
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Ride Height Change
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Offset Difference
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Plus sizing involves increasing wheel diameter while decreasing tire sidewall height to maintain similar overall diameter. This provides better handling and appearance while keeping speedometer accuracy.
When the overall tire diameter changes, your speedometer will read incorrectly. A larger diameter makes the speedometer read slower than actual speed, while smaller diameter makes it read faster.
Wheel offset (ET) is the distance from the wheel's mounting surface to its centerline. Changing offset affects how far the wheel sits in or out from the vehicle, impacting clearance and handling.
No, you must consider load ratings, speed ratings, clearance issues, and manufacturer recommendations. Always consult your vehicle manual or a tire professional before making changes.
Multiply tire width by aspect ratio to get sidewall height, then add twice the sidewall height to the wheel diameter. For example: 225/60R16 = 225 × 0.60 × 2 + 16 inches.
Larger wheels with lower profile tires can improve handling and braking due to less sidewall flex, but may reduce ride comfort and increase susceptibility to pothole damage.
Yes, when changing wheel and tire sizes significantly, your TPMS sensors may need recalibration or replacement to ensure accurate pressure monitoring in the new setup.
Oversized tires can rub against wheel wells, suspension components, or body panels, especially during turning or suspension compression. This can cause damage and safety issues.