Tyre size question

[Swivel]

Just a quick question
What's the difference between a 180/55-ZR17 and a 180/55-17. would they still fit on the same bike?
Cheers

[RGVforme]

Just a quick question
What's the difference between a 180/55-ZR17 and a 180/55-17. would they still fit on the same bike?
Cheers

Im not sure but I think its Speed rating then tyre design.....So ZR is

Z speed rated to 150mph

R is a Radial made tyre.

Im sure someone else on here will confirm or correct.

[T.W.R]

https://www.google.co.nz/url?sa=t&so...InJWrtbMsmqPYw

The Z is the important factor...... Speed rating. Unmarked is most likely only H rated

The link explains it

[Gremlin]

https://en.wikipedia.org/wiki/Tire_code

Physically, you're looking at the numbers, so yes, they're identical. Letters (as also mentioned above) amongst many things can be speed rating and notation for radial etc.

[Blackbird]

The only thing to add is that the total width of a tyre varies across different brands. The OEM Dunlop D214 190 section tyre on my was 197 mm across its maximum width. The 190 section PR4 which I currently have on it is almost exactly 180 mm.