When to change your car tires

Do I need new tires? | When to change tires
May 31, 2015 – 10:47 am
The when to change your car

Some performance-minded drivers upgrade their original equipment wheels with wider, bigger wheels. It’s called tire upgrading or plus sizing.

Why do it?

  • It offers better handling when done properly
  • It can make the vehicle look sportier

Two ways of doing it:
1- Plus 1, 2, Etc.

The most popular form of plus sizing is increasing your vehicle’s wheel diameter and your tire’s rim diameter. An example is changing from a 14” wheel to a 15” wheel. This is called “plus 1.” (Going from 14” to 16” is plus 2, etc.) To make plus-sizing work, the tire’s aspect ratio decreases while the wheel diameter increases. (Note: The overall diameter of the tire never changes, just the wheel diameter.)

2- Plus Zero

If you want to leave your wheel diameter the same, you can still change to a wider tire. (Note: You may need a wider wheel as well.) An example is going from a P195/75R14 tire to P215/65R14 tire. What this means is that your tire width will be wider (195 millimeters to 215), your aspect ratio will be smaller (75 to 65) but the wheel diameter stays the same (14 and 14). Why do this? A wider contact patch on the road can mean better grip and handling.

What Is Staggering?

A staggered fitment is putting larger wheels on the back of your vehicle than the front of your vehicle. This specification comes from the vehicle’s manufacturer, and is designed to improve performance on vehicles with rear-wheel-drive.

Very Important Plus-Sizing Legal:

Michelin recommends checking with the vehicle manufacturer to identify any restrictions to an alternate tire size. Changes in the tire/wheel diameter can affect vehicle systems such as gearing, traction and stability control systems, braking and speedometer reading. Some manufacturers have already tested and approved multiple wheel diameters, so be sure to ask your authorized MICHELIN tire dealer on any sizing needs.

Source: www.michelinman.com
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Popular Q&A
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When do you think is the right time to change your tires?

Tyres should have indicators on them where you can see whether a tyre is worn out and has to be replaced or not. Each manufacturer has their own indicator sign, but it's usually very similar to the following:
1. Look for a sign (in this picture a little triangle) that indicates the place of the tread indicator.

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