Sorry to be so late in responding. Since your 185 is 2WD, most any tire will work, except for finding one the correct size. I have purchased Titan 489's at Walmart and then had them installed on the rim at a local tire store. Also, Tractor Supply Company downhere in TX sells a variety of ATV tires along with tractor and mower tires.
I don't know what type of ground, soil you are riding on but I would recommend that whatever tire you select, that you add slime before heading out. Sure does work good to keep you from being stranded with a flat.
I have purchased tires online for my motorcycle from Dennis Kirk. Like sourdough said, you have to pay the shipping cost which usually negates the original savings compared to buying them in a store.
www.denniskirk.com