How To Read Your Tyre Size

Along with the manufacturer's name and the name of the tyre (e.g. Bridgestone Ecopia), there's always a set of numbers and letters that relate to the size of the tyre. Here's a rundown on what those numbers mean:

Example: 215/60R15

  • 215 is the width of the tyre in millimetres.

  • 60 is the aspect ratio or tyre profile.

  • R means it is radial construction.

  • 15 is the diameter of the wheel rim in inches.

What's a tyre's profile?

This relates to the depth of the sidewall (the wall at the side of the tyre). The profile is expressed as a percentage of the tyre's width. Eg. Our 215/60R15 tyre has a profile or sidewall that is 60% of the 215mm (width).

A low profile tyre is generally 50% or below, down to as little as 30% with ultra-low profile tyres. Higher performance vehicles are usually fitted with tyres that have lower profiles. 

While low profile tyres give you greater control and better handling on corners, they can give a slightly harder ride. Also, going to a lower profile on the same size wheels will alter your speedometer reading so you'll need to fix that up before you hit the road. Talk to Tasman Tyres and we can help you get the right fitment.

Car/4x4 Tyre Sizing

Fitting different size tyres to the original equipment can alter ride, height, gearing, speedometer accuracy and odometer reading rates. This can end up costing you money! Our expert staff can advise the appropriate tyre size for your vehicle if you change rim size. The original tyre size is found on a chart, usually inside the driver's door frame.


  Contact your local branch to inquire if your size is available in a particular pattern