275/60/15 for example.
25.4mm per inch.<--conversion.
aspect= sidewall ( be sure to use decimal point)
width= over all,not just the tread.
heitht=aspect x width =( ? ) x 2 + rim size

width= 275/25.4 = 10.8"
height= 10.8 x .60 = 6.48
6.48 x 2 = 12.96
12.96 + 15 = 27.96"

hope this helps .


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My '68 Camaro (http://hometown.aol.com/Dougs68Camaro/index.html)
Doug G.
68 Camaro
406 ci.
13.5@102 W/ 2.73POSI.



[This message has been edited by DOUG G (edited 04-24-2002).]

Got another one for ya. This site has been so helpful to me, just thought I would pass it on.

http://www.miata.net/garage/tirecalc.html

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67 Pro-touring Camaro-327, 9:1, Comp XE268 Cam, Perf. RPM Intake. 750 Holley, Sportsman II Heads, Ceramic coated headers, 700R4 trans, 17" Amer. Racing TT2's, 12" disc brakes, custom stereo, black with white stripes, cowl ind. hood.

And here is yet another helpful site.
http://www.discounttire.com/dtc/brochure/info/helpDeskHome.jsp

Doug- Thanks for posting the tire math. It came at just the right time since I am trying to figure out what wheels and tires to put on my 67. The equation was very beneficial.

Richard