Best Tires for Old Sears Roper? Sizes, Brands & Where?

#1
She currently has a 10/3.5-6 stud for the front and a 13/5.00-6 (looks like a turf) in the rear. Just checking what should be on there. The rear definitely doesn't come close to squeezing in the front forks. Are these the correct sizes? There really isn't much room to go any larger or wider. I was thinking something a little more rounded than the studs but not sure how that would handle turns. We'll mostly be riding on grass/dirt off road. Anyway, any info would be greatly appreciated.

Thanks much,
Robert
 
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