OK... a dumb odometer question...
Posting Guru
Joined: Mar 2001
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OK... a dumb odometer question...
Guys, I have 31's on my '79 F100, 300. I understand the math of the greater circumference giving more speed than what registers on my spedo. I deal with it, until I get to the interior of the truck. Here's my question: Since I'm really traveling faster than my spedo indicates, is my odometer also registering less miles than I'm actually traveling? This makes sense to me, yet it now complicates my calc's for MPG, oil change intervals, yada yada yada. Has anybody had this suspicion running larger tires?
Lead Driver
Joined: Nov 2000
Posts: 6,637
Likes: 349
From: Albuquerque
OK... a dumb odometer question...
It's true.
1977 Ford F-100
400m/c6/4:11/Gear Vender O.D.
Crane hydralic roller, forged, ported polished,Deamon,Edlebrock, yada, yada, yada
280,000 miles
Stock on the outside
modified/rebuilt everything
1977 Ford F-100
400m/c6/4:11/Gear Vender O.D.
Crane hydralic roller, forged, ported polished,Deamon,Edlebrock, yada, yada, yada
280,000 miles
Stock on the outside
modified/rebuilt everything
Senior User
Joined: Dec 2000
Posts: 435
Likes: 0
From: Nebraska Farm
OK... a dumb odometer question...
yes it happens, but its a pretty small percentage. Just because your 5mph different at 60 doesn't mean your still 5 different at 10. Its all a percentage difference. Mine with 33's is about 10% off. which at an actual 60 mph, my speedo shows approx. 55 mph. For a measured mile, my odometer only trips 9/10 of a mile. over 100 actual miles, I only show 90, and so on. It isn't that big a deal to me, I would rather not know what mileage I get poor is poor.
Dave,
79 F-150 4x4, 390 w/C6, Edelbrock carb, 33X12.50 never will be finished.
Dave,
79 F-150 4x4, 390 w/C6, Edelbrock carb, 33X12.50 never will be finished.
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