I had the right idea but wrong dimension. 23.23" is the diameter, not the circumference. Elvis had it right with the 43.98" dimension. Guess it was too early in the morning for me. Bruce Benson From: Bruce Benson Sent: Monday, May 05, 2008 9:48 AM To: dmcnews Subject: [DML] Re: Speedo gear rpm The 195/60/14 tire is 23.23" in diameter. A mile = 5,280 feet x 12"= 63360" . Divide that by the tire's 23.23" = 2727.5 revolutions per mile. 60 mph is a mile a minute so at 60mph the speedo gear is turning 2727.5 rpms. Bruce Benson ___________________________________________________ ------------------------------------ To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnewsYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/