In the 18 years since Michael Sullivan left the corporate world and bought a tire store in California, he’s quadrupled that business’ sales. But he admits he hasn’t done it alone.

Bill Leach had wanted to expand beyond his one-store tire business in Paola, Kan., for some time. So when he finally found the perfect location for a second store, about 30 miles away in Baldwin City, Kan., he was ready to roll. And one decision at least was an easy one.