I have R4's that I use with chains on all 4 on my steep driveway. It looks like R14's might be just a bit better on flat land with a normal snow fall. However either 4's or 14's would have a hard time in deep or wet snow. On ice either would be useless without chains.
In the deep snow of last Dec 17th, I would be waiting for spring melt without chains.
Alan
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