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Tyre Tread Widths - Interesting Stuff......


Tony
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On some tyres the actual width displayed is telling fibs? I appreciate that there are other factors contributing to the actual tread width once on the car and even more so once the car is in motion so maybe this is why some race series only allow one make of tyre?

 

Key to reading tyre measurements

post-2-0-16373800-1415094774.gif

 

Actual widths

 

Avon ZZR 185/55/13   170mm tread width
Toyo R888 185/60/13  178mm tread width
Toyo R888 205/60/13  198mm tread width
Kumho V70a 215/50/13  203mm tread width
Toyo R888 225/45/13   221mm tread width
Federal FZ-201 195/50/15  209mm tread width
Federal RS-R 195/50/15  176mm tread width
Toyo R1R 195/50/15   183mm tread width
Toyo R888 195/50/15  191mm tread width
Kumho V70a 195/50/15  180mm tread width
Kumho V70a 195/55/15  190mm tread width
Federal RS-R 205/50/15 182mm tread width
Yokohama AD08r 205/50/15  196mm tread width
Toyo R888 205/50/15  198mm tread width
Kumho V70a 205/50/15  208mm tread width
Yokohama A048 205/50/15  208mm tread width
Toyo R888 225/45(&50)/15  221mm tread width
Kumho V70a 225/50/15  206mm tread width
Dunlop DZ03G 225/45/16  230mm tread width
Dunlop DZ03G 225/50/16  235mm tread width

 

 

 

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  • 1 month later...

Often wondered how the stated width relates to the actual contact patch on the road?

 

Given variances in profile/pressure/vehichle weight I guess there's almost no accurate correlation at all?

 

Eg....Given my 18's will take a 235 and a 245. This doesn't necessarily mean a 245 will have a wider footprint. Just points to the differance in that particular manufacturers sizes, relative to the next smaller or bigger size.

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Possibly. But a list of width sizes, as given with differant makes and models that clearly give differant widths, doesn't mean those makes and models will give a footprint directly relative to the width measurement.

 

Assuming the same make and model would give best chance, with a wider size. Fluid dynamics and pressures aside. To my thinking anyway. ...?

 

 

Interested to see what Tony and others says reguarding this. :)

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  • 7 years later...

Sorry to revive this thread but where did you find those actual tyre widths?

I'm currently looking to upgrade my 205 tyres to 215 but if my current 205s are more like 208 fitted and the new set of 215 that I want is more like 210 then I'll be paying a lot more for a more awkward size for not a lot of benefit.

Thanks

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On 05/07/2022 at 13:25, anothercarguy said:

Sorry to revive this thread but where did you find those actual tyre widths?

I'm currently looking to upgrade my 205 tyres to 215 but if my current 205s are more like 208 fitted and the new set of 215 that I want is more like 210 then I'll be paying a lot more for a more awkward size for not a lot of benefit.

Thanks

Sadly Tony is no longer with us and I have no idea where he got those figures from. I guess it's going to depend on what brand tyres you have fitted now and what you're planning on replacing them with.

I must've missed this thread when Tony posted it but it's not something I've ever thought about.

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