Needed new front tires for my 165d. Current (probably original) tires are Goodyear 6-12, ag tread. I live where mail-order is the only option, and cannot drive out of here - air or water only. Ordered two Carlisle 6-12 ag tread tires. One just arrived. It looks too small in rim diameter (rim size) to me. It's about 12 inches. The Good year tire rim edge to rim edge is 13 and 1/8. Freight/postage will be too much to justify returning. Second tire will likely arrive tomorrow. What should I order for tires to fit these rims? Thanks.