I agree with both Mike and Biggd on their points, but at this point I will continue running R4s on my L5240 because I use the full capacity of the loader frequently and am often in rough ground. I too run chains in the winter because the because otherwise the machine slides all of the place, but with the R4s even the chains are a bit compromised because, even though they are chain loop bearpaws, some of the crosslinks want to hide between the tire lugs. Plus at nearly 100 pounds apiece they are a real chore to put on. Chains perform much more smoothly on turf tires and can usually be of a lighter construction.
Which tractor are you upgrading to, standard L or Grand L? If you are just going up one step to the standard L and your terrain isn't too rough I would think that the R14s would work out fairly well as the loaders on the Standard Ls only have about 2/3 of the lift capacity of the Grand Ls ...but if your driveway has any slopes I bet that you will still need chains.
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