[TR] Tire Sizes

Randall tr3driver at ca.rr.com
Fri Jul 26 15:30:10 MDT 2019

The 185HR15 will be quite a bit taller than the 185/65.

The number after the slash “65” when present, indicates the ratio of sidewall height to tread width, in percent.  So for 185/65, the sidewall is only 65% as tall as the tread is wide, meaning roughly 120mm high.

When the second number is not present, the ratio is usually in the region of 80%, meaning the 185HR would be around 144mm high.  Almost an inch taller (ride height) than the 185/65.

All very approximate, and can vary somewhat from tire maker to tire maker or even tire model to tire model.

In case you’re wondering, the ‘H’ is a speed rating, meaning the tire should be able to sustain speeds of 130 mph (when loaded within the limits given elsewhere on the tire).  ‘R’ indicates radial tire construction.


Sent from Mail for Windows 10

From: William Pugh
Sent: Friday, July 26, 2019 4:07 PM
To: TR3/6
Subject: [TR] Tire Sizes

What…if any … is the difference of 185HR-15  … and 185/65/15…??

Thanks, not trying to start a war…😉

Bill Pugh
Wallace, CA

Life is too short
to drive Boring Cars

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