" From: Frank Swygert <farna@xxxxxxx> " " " Just divide the width in millimeters by 25.4 to get inches. To figure " the sidewall height, multiply the width in mm by the "series" number " with a decimal in front of it. A 195/78 has a sidewall height of 195 x " .78 = 152.1 mm (6"), a 205/70 like I run 205 x .70 = 5.7". I said " sidewall height, but that's really the total height of the tire from " the rim to the center of the tread -- the tread bulges just a bit from " the edge of the sidewall. I checked it on my car to make sure I'm " correct! Total diameter is wheel size plus sidewall height x 2, on " mine it's 15 + (5.7 x 2) = 25.4". there's another factor. spec tire width is assuming a particular rim; widen the rim by 1" and the actual tire width increases by 10mm. reference rim for the 195/78s is probably 5.5", so running them on 7" would make them an actual 210mm wide. " ------------------------- " From: WILLIAM SERCKIE <realtorbill@xxxxxxxxxxxxx> " " " I am running 195 78 14 on my 65 w/a set of 14x7 Cragar Smoothies, btw 215/70s are almost precisely the same rolling diameter as 195/78s. ________________________________________________________________________ Andrew Hay the genius nature internet rambler is to see what all have seen adh@xxxxxxxxxxxxxxxxx and think what none thought _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list