Tire size?

#1
I'm new to rebuilding old mini bikes. I'm not sure what size tires and rims I need to get for trail riding. I'm not doing any crazy off roady rally stuff, I'm just riding on dirt a lot.
 
#2
I'm new to rebuilding old mini bikes. I'm not sure what size tires and rims I need to get for trail riding. I'm not doing any crazy off roady rally stuff, I'm just riding on dirt a lot.
IMO, 6" wheels prove too small for the sand and loose dirt here. 8" seems to be the minimum size for me.

The driving factor is always about fitment though.
 
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