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October 09, 2020 2 min read

Sometimes choosing the right tyre size or even understand what on earth the guy at the tyre shop is talking about can be quite daunting. We've all been there nodding our heads like we know what the fuck he's talking about! 

Choosing the right tyre size can be difficult so we have explain what the sizing means for you to be able to understand what your car may need. 

Tyre Size Detail

  1. Tyre width - "235" on the sidewall indicates 235mm (millimetres) which is the cross-sectional width of the tyre. This would be considered depending on the use you were going for. For example general use, drift or drag. 

  2. Profile or Aspect Ration - "45" on the sidewall is the height percentage (%) compared to the width of the tyre. For example the tyre height would be 45% of 235mm = 105.75mm in height. 

  3. Construction of the Tyre - The letter "R" represents the construction of the tyre. Essentially "R" rated indicated the tyre is radially constructed. This means the internal ply cords extend from bead to bead. The "Z" on the tyre above means this particular tyre is rated for speeds above 240km/hr (slow the fuck down). 

  4. Rim diameter - 17 on the sidewall code indicates 17inch (inches) which is the diameter of the rim which the tyre is on. You may consider this for ride height or wheel fitment. 

  5. Load Capacity & Speed Index - This symbol represents the maximum load capacity depending on the load capacity index & the speed at which the tyre can safely operate at. This is all considering the tyres are in useable condition, fitting correctly, correct inflated pressure, balanced & aligned correctly. 

The tyre sidewall code is obviously located on the sidewall of the tyres (it's in the name lol). That code does represent the tyre information of that tyre although you may also be wondering what tyre size is the right one for your car or recommended by the manufacture. 

The information for the correct tyre size can be found in a few places depending on your car;

  • The owner's manual
  • The fuel hatch
  • The glove box 
  • The drives door post

It may be worth checking this information along with consulting your local tyre shop to see if both are telling you the same thing!


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