Maintaining the same overall diameter ensures your speedometer remains accurate, your vehicle's gearing works as designed, and safety systems like ABS and traction control function properly. A difference greater than 3% can cause significant issues with vehicle performance and safety systems.

Yes, tire size can impact fuel economy. Wider tires typically create more rolling resistance, which can decrease fuel efficiency. Heavier wheels and tires also require more energy to rotate, further reducing economy. For maximum efficiency, stay close to your vehicle's original equipment specifications.

When plus-sizing, you can typically go 10-20mm wider than your original equipment without issues. However, going too wide can cause tires to rub against suspension components or fenders during turns or over bumps. The maximum width depends on your specific vehicle, wheel offset, and suspension setup.

Plus-sizing often improves handling by providing a wider contact patch and stiffer sidewalls, which enhance cornering stability and steering response. However, the trade-off is typically a firmer ride and potentially more road noise. For daily driving, a modest plus-one size usually offers the best balance between improved handling and ride comfort.

Your ability to use the same tires year-round depends more on the tire type than the size. If you live in an area with severe winters, you should consider dedicated winter tires regardless of size. In milder climates, all-season tires in your new size may be suitable year-round. Remember that wider, low-profile tires typically perform worse in snow and slush.

If you maintain the same overall diameter (within 1-3%), reprogramming is typically not necessary. However, if your new tires have a significantly different diameter, you may need to recalibrate your speedometer and odometer. Some newer vehicles with advanced driver assistance systems may also require recalibration when changing tire sizes substantially.