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Fri Dec 10, 2004 6:42 am

I tried to figure out what the difference is in height between the 135 and the 145 tires. But none of the tire websites list a 135 and I couldn't really figure out what they were indicating with a 145.

Also, will a tires overall height be affected by the width of a rim? i.e. going from a 4.5" to a 5.5" rim.

And, just for grins....I know that a 175/55 x 15 is the same overall height as a 135 but is wider. These seem to be nearly impossible to find. Is there another tire in the same vein that is available?

Fri Dec 10, 2004 6:58 am

If I remember correctly the ratio of sidewall to thread is 0.78. If you take that and multiply it by the with (135, 145, or 165) it will give you the height for the sidewall. You then multiply it by two and divide by 25.4 (to convert from mm to in. To that number you add the rim size (15") and that should get you the tire height.

[(135*0.78*2)/25.4] + 15 = 23.3"

For other combinations you would need the correct ratio, in the 175 you are talking about the ratio is 0.55. So the formula yields:

[(175*0.55*2)/25.4] + 15 = 22.6"

Although not identical very close. Hope this helps.

Fri Dec 10, 2004 8:36 am

I'm a Nankang dealer.

135 = 23.62 overall height, 5.59 section width 4 rim width

145 = 24.25 overall height, 5.98 section width 4 rim width

Nankang doesn't make a 175/55/15

good luck!

Fri Dec 10, 2004 10:36 am

Thanks guys! That really helps. It's great seeing the math broken out.

So it looks like going from a 135 to a 145 is about a 1/2" to 3/4" difference in height? I can live with going from a 135 to a 145.

Now Chickengeorge, the heights that you give are based on a 4" rim. Would a wider rim yield a lower height?

Say going from a 4.5' to a 5.5'. It seems kinda logical that as the contact points are placed further apart that the overall height of the tire would change to compensate. Or would this be negligible unless the wheel was extremely wide?

Fri Dec 10, 2004 12:49 pm

Jerry J wrote: Thanks guys! That really helps. It's great seeing the math broken out.

So it looks like going from a 135 to a 145 is about a 1/2" to 3/4" difference in height? I can live with going from a 135 to a 145.

Now Chickengeorge, the heights that you give are based on a 4" rim. Would a wider rim yield a lower height?

Say going from a 4.5' to a 5.5'. It seems kinda logical that as the contact points are placed further apart that the overall height of the tire would change to compensate. Or would this be negligible unless the wheel was extremely wide?

Sounds logical to me. I'm not sure how big a diff it would make though.

Fri Dec 10, 2004 12:53 pm

Jerry J wrote: Thanks guys! That really helps. It's great seeing the math broken out.

So it looks like going from a 135 to a 145 is about a 1/2" to 3/4" difference in height? I can live with going from a 135 to a 145.

Now Chickengeorge, the heights that you give are based on a 4" rim. Would a wider rim yield a lower height?

Say going from a 4.5' to a 5.5'. It seems kinda logical that as the contact points are placed further apart that the overall height of the tire would change to compensate. Or would this be negligible unless the wheel was extremely wide?

I would recomend you check with the tire manufacturer what is the range of rim width sizes they recommed for their tire. A 5-1/2" rim is getting very close to the same width as a 135 tire.

Fri Dec 10, 2004 5:25 pm

Miguel Arroyo wrote:
I would recomend you check with the tire manufacturer what is the range of rim width sizes they recommed for their tire. A 5-1/2" rim is getting very close to the same width as a 135 tire.

This is why I'm thinking that I'd go ahead and get 145's to go with my new wheels. I've heard that might even be a stretch. I just don't feel comfortable putting my Kleber (tubed) 135 on there.