wide tires
All Star
Joined: Feb 2006
Posts: 928
Likes: 0
From: Va.
RE: wide tires
It doubt the guy would have changed the gears to go to a 285 tire unless he was towing something heavy with the truck. If you know what RPM's are you running at given speeds you can determine the ratio also. Close anyway. If you speedometer has been off, than your MPG calculation has too. With taller tires you are travelling farther than the odometer thinks. Depending on the original tire size and how far the reading is off. Say 320 miles to a tank instead of the 280 the odometer reads. Just a thought. Your mileage might not be that bad.
Record Breaker
Joined: Mar 2006
Posts: 1,759
Likes: 0
From: in the woods NY
RE: wide tires
ORIGINAL: Chopper1
It doubt the guy would have changed the gears to go to a 285 tire unless he was towing something heavy with the truck. If you know what RPM's are you running at given speeds you can determine the ratio also. Close anyway. If you speedometer has been off, than your MPG calculation has too. With taller tires you are travelling farther than the odometer thinks. Depending on the original tire size and how far the reading is off. Say 320 miles to a tank instead of the 280 the odometer reads. Just a thought. Your mileage might not be that bad.
It doubt the guy would have changed the gears to go to a 285 tire unless he was towing something heavy with the truck. If you know what RPM's are you running at given speeds you can determine the ratio also. Close anyway. If you speedometer has been off, than your MPG calculation has too. With taller tires you are travelling farther than the odometer thinks. Depending on the original tire size and how far the reading is off. Say 320 miles to a tank instead of the 280 the odometer reads. Just a thought. Your mileage might not be that bad.
So the speed is calculated by the sensor in the axle housing and not in the tranny. His speedo will be correct.
All Star
Joined: Feb 2006
Posts: 928
Likes: 0
From: Va.
RE: wide tires
I'm not familiar with the setup.
The only thought I would have, is the sensor would either read the alxe shaft, gears, or the input. Either way if the diameter of the tire is greater than the original, than the circumferance will travel farther than the original with the same, one revolution of the shaft. JMO
The only thought I would have, is the sensor would either read the alxe shaft, gears, or the input. Either way if the diameter of the tire is greater than the original, than the circumferance will travel farther than the original with the same, one revolution of the shaft. JMO
Thread Starter
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Captain
Joined: Sep 2005
Posts: 722
Likes: 0
From: Long Island, NY
RE: wide tires
ORIGINAL: GOD RAM IT
He has a 98
So the speed is calculated by the sensor in the axle housing and not in the tranny. His speedo will be correct.
He has a 98
So the speed is calculated by the sensor in the axle housing and not in the tranny. His speedo will be correct.