Stupid Question

[lee3645]

What does the number for tier size stand for? The owner’s manual states that rear is a 150/70 ZR 17 I get that the 17 is the rim size but what about all the rest.

[GytRDunKat]

150 is the width (mm) and 70 is a percentage of the width, which indicates sidewall height (70% of 150). ZR is the speed rating.

[Black_peter]

No such thing as stupid questions..
(with in reason )
Only people too stupid to ask..

[lee3645]

Sweet thanks guys

[prozac420]

150 is the width (mm) and 70 is a percentage of the width, which indicates sidewall height (70% of 150). ZR is the speed rating.

Z indicates the speed rating of the tire. The R designates the tire as being a radial.

[GytRDunKat]

Z indicates the speed rating of the tire. The R designates the tire as being a radial.

I thought of that after I wrote it. Good catch!