Converting race car tire sizes to standard form?

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Nov 30, 2003 | 02:08 PM

mantronix

Thread Starter

1st Gear

Joined: Nov 2003

Posts: 12

Likes: 0

From: The Motor City

I was looking at some race car specs. The wheels were listed as 17x9, but the tires were listed as 24/61-17. What system of measurement is this? For the sake of comparison, how do I convert that to the usual 2xx/yyR17?

Thanks.

Dec 1, 2003 | 01:38 PM

Alex@tirerack

6th Gear

Joined: Sep 2002

Posts: 3,343

Likes: 4

From: South Bend Indiana

>>I was looking at some race car specs. The wheels were listed as 17x9, but the tires were listed as 24/61-17. What system of measurement is this? For the sake of comparison, how do I convert that to the usual 2xx/yyR17?
>>
>>Thanks.
>>

Most non DOT race tires use sizing much like flotation truck tires

24 = overall diameter
61 = width in inches
17 = wheel diameter

The part I am confused about is 61 - There is no way that its 61 inches wide.

Can I get clarification on this number?

Alex