Tyre diameter difference 265/70/16 - 265/75/16

Thanks Al. I need a slightly more offroad tyre for a trip next year. The ones ofeered are 70 profile. We do not really need the extra height as we don't tow nor do we climb over rocks. But I must admit I have climbed over a couple of trees. Couldn't pull them off the track so climbed over.

Thanks

OK - I give up. Where does the 5% come from?

Moose, the 70/75 is the aspect ratio. What that means is the sidewall of the 265 tyre is 70 or 75% of the width of the tyre. Therefore a 70 series sidewall is 185mm tall (70% of 265) and a 75 series is 198mm tall (75% of 265)

Thanks John but I knew what the numbers meant - I was trying to figure out the 5% bit. I can see that the resultant difference in this case is about 5%, but I don't see how multiplying the width by 5% will always provide the correct answer. Perhaps I've misread Don's answer, but that's how I interpreted it.

Well in this case the difference between a 70 series and a 75 series is 5%. 5% of 265 is 13.25.... It's because its a ratio.
Same if you were to use an 85 series in the example. Then you'd have a sidewall height of 225mm which is 15% higher than a 70 series.

I dont understand your thnks to everyone bar don reply because when i posted my reply to your question i was not having a go at anyone i was only saying that you didn't need to go to a web site to work it out

The 70 & 75 is the height of the side wall expressed as a percentage of the width (265mm)

Regards Don

Fair enough. I thought you were. That's the problem with the written word. Grammar and punctuation can make a phrase appear quite condescending. As did your lpost.

Thank you for clearing that up.

Phil

No worries

Regards Don