Posted by Rick Kr on April 10, 2014 at 20:25:46 from (198.105.227.106):
Looking for someone to tell me I am on the right track.
I am switching my NH3930 4wd from 9.5-24s and 14.9-28s to R-4s. I need to keep the ratio the same for the 4wd.
Using Titan/GY specs:
For my current tires I came up with 78.8% front/rear.
Switching to 12.5/80-18s and 16.9-24s, 75.1%. (rear tires going faster)
12.5/80-18s and 17.5L-24s, 79.9% (front tires going faster)
Do you agree I need to go with the 12.5/80-18 & 17.5L-24 combo? It will be off by only 1%. Plus air pressure in the tires will vary that a little.
I can put the 12.5s and 16.9s on, as I already have them all, but thinking I should switch out the 16.9s for 17.5s.
FWIW, the R-4 option on this tractor was 11.2R20/16.9-24. The 20" rims are impossible to find. The tires I have worn out and need replaced, and I need to switch to the R-4s.
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