In 1932, the route was slightly extended south to Convoy  south of US 30 before absorbing SR 51 south to Greenville the next year. All of SR 51 was then renumbered to SR 49 in 1935 extending the route from downtown Dayton to Michigan.
In 1932, the route was extended slightly southward to Convoy , which is south of US 30, before incorporating SR 51 south to Greenville. In 1935, all of SR 51 was renumbered as SR 49, extending the route from downtown Dayton to Michigan.