I run 18.4 x 42's on a R52. I use a 6 row corn head. Have no problem harvesting corn, could be a problem if corn wasn't standing. Once you run duals you won't go back. Randy
If you buy new, I'd go with Unverferth, have a set and they are MUCH heavier wheel than a JD, and you can take the dual off without taking main wheel off. Have heard of JD dual's cracking.
Not a problem to take the outer dual off for hauling, the outer duals attach to the inner wheel with a separate set of bolts. I actually saw a R62 running with just the inner duals (owner was running a 6 row corn head instead of an 8 row)..based on the weight I would think it isn't recommended but would be fine for transporting. If you buy the combine and want to get rid of the duals I have a nice set of 30.5x32 tires on rims that will fit an R62_72 that I would give as partial trade for your duals
I'm interested in trading for your duals. I have 30.5 x 32 singles. I'm in Montana, but the combine is in Mandan ND. Willing to give some good $$$ to trade for good 18.4 x 42's. dumfrmr@direcway.com