Plus sizing or up-stepping is the practice of replacing the wheel with a larger one and mounting a lower profile tyre while maintaining the same (or approximately the same) diameter and circumference as the original tyre.
These dimensions must be maintained in order to prevent considerable changes in speedometer accuracy, torque and traction control. Our tyre plus sizing calculator can help you to find optimal tyre dimensions for plus sizing.
Plus x sizing means increasing the wheel diameter by x inches, so plus one sizing means increasing the wheel by one inch. A special case of the tyre plus sizing is the Plus Zero sizing which means switching to a wider tyre without changing the existing rim diameter. But beware, take into account that a wider tyre may require a wider rim/wheel.
Plus sizing methods: Plus One and Plus Two always require a replacement wheel.
Changing to a wider tyre requires reducing the aspect ratio (which is the second number in the sequence of numbers that describes the tyre's size e.g. 195/65 R15). Since the aspect ratio is the ratio of a tyre's width to its height, it follows that if the width is increased, the aspect ratio should be decreased if the final result is to remain the same—which is the objective of plus sizing.
Why Plus Sizing?
Plus sizing is usually done to improve aesthetics but also performance since original tyres are fitted with respect to, beside performance, noise, abrasion resistance, and comfort. Therefore, they may not be good enough for performance enthusiasts.
- Pros and cons of plus sizing - Putting on larger wheels and lower tyres looks really cool, but bigger wheels means more weight which can affect fuel economy, suspension, braking system,...
- Tyre plus sizing calculator - Tyre Plus Sizing Calculator helps you to find the optimal tyre size when you install the larger wheels on a car. It calculates the tyre dimensions for plus sizing.
- Tyre size for rim size calculator - It gives you answer to the question:"I'm going for 6.5 x 15j rims. What's the best tyre size?"
- Tire width for a wheel/rim size chart - There is a tire width range for every single wheel size. When replacing a wheel or a tire with a wider one, you could ask yourself: what tire widths fit to my wheel?
- What is the Measuring Rim Width? - Each tire size has a rim width range on which the tire can be mounted.