Depends on the axle and transfer box ratios. 13.6 and 14.9 are the more 'normal' matches I've seen with 18.4 rears, but that does vary. The best suggestion I can make is that you figure out the transmission output speed, rear axle FINAL/TOTAL reduction ratio, transfer box ratio and front axle TOTAL ratio. Then get the tire 'rolling circumference' for your tires (or the proposed replacements) from the tire manufacturers website. With that information you can calculate the theoretical ground speed for both the front and rear axles. With that in hand, you want to get the front 'leading' (turning faster) by 1-5% (I'd aim for closer to 5%). Find a tire combo that will do that. At just a guess, I'd say that if you presently have trouble with the tractor 'plowing' or scuffing the fronts then the front tires are too small... Beyond that you'll need to compute the ratios out to know what tire you need.
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