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## Re: RPM vs MPH question

 To: "Keith Turk" Re: RPM vs MPH question Thu, 2 Jun 2005 08:37:05 -0500 <20050602.064336.3236.2.dmeadow@juno.com> <006a01c56768\$ec1d4c90\$8d00a8c0@keithhrijwmm4p>
 ```----- Original Message ----- From "Keith Turk" You really need to measure the tire on the car... wear being what it is and all.... the ideal way to do it is to measure from the ground to the center of the axle and then double that number... this takes into account the amount of squat the tire has.... But we aren't even that fancy at Bonneville... Keith *************************** Keith, with deference to your expertise at Bonneville etc., I believe the reason one needs the diameter of the tire is to solve for the circumference of it -- i.e. the distance covered by one revolution of the wheel. The circumference, for all practical purposes, won't change with tire squat -- only the portion of the circumference that lies flat on the road. For that reason, I would think it would be more accurate to measure the diameter with no load on the tire to get a true (to what extent possible) rolling circumference. I dont know that there is an accurate way to measure tire growth under high rpm, but that will also change the circumference and, therefore the distance covered per revolution of the wheel. Tell me where you think I'm wrong here, but this makes perfect sense to my tiny, little brain. Larry Daniels 79 MGB LE 72 Midget 58 Bugeye "You only need two tools: WD-40 and Duct Tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape." ```
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