165/55r14s are also?

Status
Not open for further replies.
Joined
Jul 27, 2004
Messages
2,470
Location
Frankfort, Kentucky
Time to do some tire shopping before inspection, and I was wondering what else I could be looking at. I remember that add to the 55 would remove some from the 165, but I don't know how to do that exactly and keep the speedo on.
 
Your overall diameter is your most important aspect. To find this is simple. Remember 25.4 mm in an inch and the "middle" number which is a representation of the sidewall height is proportional to the "first" number, which is the width of the tire in mm. So with your 165/55/14, 165 divided by 25.4 yields ~6.5. So this tire is ~6.5 inches wide. Now take this and multiple by the percentage of the sidewall, in this case 55. So 6.5 * .55 is ~3.57. There are (2) sidewalls when calculating an overall diameter, so 3.57 * 2 is 7.14 PLUS the diameter of the rim, which is 14. So 7.14 + 14 is 21.15 inch diameter.

By the way, some tire websites have overall tire diameters listed which saves you from doing this math. Hope this helped.
 
Status
Not open for further replies.
Back
Top