What size s-12's for my 2002 wr426

I want to put mich s-12's on my stock 2002 wr426. What sizes do I need front and rear and where is the best place to buy them cost wise. S-12's seem to come in funny sizes. I ride in michigan which is almost all soft sand. Is this what others using or is there something better out there?

Awesome tires! For the front all they offer is the 90/90-21.

For the rear you can use either the 130/80-18 (equivalent to a 110) or the 140/80-18 (equivalent to a 120). If you are mostly in sandy stuff I would go with the 140/80-18.

Rockymountainatv has good prices.

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