tyre sizes

I currently have bfg at's at 215/75/15

can some one explain to me what each number means?

is the 215 the width, and the 75 being the height?

I know the 15 is 15" rim, so what is the other two

all I really want to know, is one i've upgraded from a 2" lift to the propper 3" kit
I'd like to bigger tyres than what I have now, But I dont know what mud tyres to choose


for a 3" lift what's the biggest any one would recomend, I dont want any thing too bad, just a little bigger than 215/75/15

In my understanding the first number is width in millimetres.

The second number is the size of the sidewall as a percentage of the width.

Eg 215/75/15

The sidewall height is 75% of 215mm.

And the last number is the rim diameter.

So if I wanted bigger tyres, but to still fit 15" rims
I can get some thing like 215/ 80/ 15?

Tommo wrote: So if I wanted bigger tyres, but to still fit 15" rims
I can get some thing like 215/ 80/ 15?

Should be slightly taller. yes. But just as wide I believe.

Don't forget the rim width plays a role and there is a limit to what each rim width can take. 215 80s are usually just labelled 215. So instead of 215 80 15 you'll see 215 15. Some of the bigger tyres are measured by stating the actual diameter - like 31 10.5 15. 31 is the height and 10.5 the width (inches). It deals with the problem of aspect intrinsically.