To complicate things even further

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Posted by Clint Dixon [172.70.127.160] on Wednesday, September 20, 2023 at 15:11:45 :

When talking about correcting a speedometer (with gearing - either internally to the transfer case - or externally with an adapter) tire revolutions per mile is taken into account. This is based upon overall tire diameter, or more specifically, tire circumference. These calculations is shown in the link provided by Tim Ellis (which I eluded to below).

However if we have a need match an axle ring and pinion ratio to a desired tire size and/or engine RPM at a given speed, tire circumference is not as much of a factor as Effective (loaded) Tire Radius. These calculations are shown here. Effective tire radius is measured from the ground to the center of the hub with the truck naturally loaded.

Junior

Follow Ups:

Another tid bit: 100rpm at cable = 60mph on ALL speedos - Chris Case 23:59:50 09/20/2023

Re: 100rpm at cable = 60mph - figure gears from that? - Chris Case 00:07:18 09/21/2023

Re: To complicate things even further - Vaughn 23:12:48 09/20/2023

Re: To complicate things even further - Clint Dixon 10:10:06 09/21/2023
- Re: To complicate things even further - Vaughn 10:30:19 09/21/2023

Re: To complicate things even further - Mike in Pa. 18:24:10 09/20/2023

Re: To complicate things even further - Jerry in Idaho 20:31:03 09/20/2023

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