Re: Measuring Rear Rim Size and Difference in Ride Height

Posted by Texasmark1 on October 16, 2018 at 05:17:54 from (75.107.74.117):

In Reply to: Measuring Rear Rim Size and Difference in Ride Height posted by RTR on October 15, 2018 at 15:52:29:

I have 2 tractors with 13.6x28 with (on a 12" rim) stamped on the side of the tires and I know the rims to be 12" as I measured them when changing.

I have another I recently purchased without the notation (on a 12" rim) on the tires......all tires were F1 with over an inch of lug showing. I'm assuming that tire is made to ride on a 13" rim and I
assume what is on the newer tractor. To look at the two tractors side by side the latter just looks larger and the wheels were made in '88 rather than '63 or '65 like the other two....has fewer
mounting points for one thing (Ford wheel dish to tire wheel interface) so there could be some uniqueness there. I may just go out and measure since this topic came up then I'll know for sure;
idle curiousity.

I do know that tires have a static OD dimension and a dynamic due to compression of the tire at the point of ground contact.....some tire charts spec both (radial charts as I recall) and the
conditions.

With that said and having gone through a lot of tires in the process of getting a soft riding with good traction lawn/pasture mower I find significant variances in specified dimensions vs actual
measured under different wheel sizes and conditions especially with low ply (2-6) bias tires. I can support the axiom that tire size differences can occur depending on ply type, air pressure/load
carried, or wheel mounting width differences.

Remembering, as I was buying that last Ford, I thought it had 2 different OD rears since it was sitting at a tilt. Observing, they were of different mfgrs, same dimension specs, ( ply ratings and
type) and wheels, only to find out later that one had around 15 psig in it and the other less than 5. Air pressure definitely did have an impact on appearance....with no visible bulge you see when a
tire is low on air pressure to give you a clue that it's low.

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