<page_title> Rollo (cyclecar) </page_title> <section_title> Models </section_title> <table> <cell> 4½ hp <col_header> Model </col_header> </cell> <cell> 1 <col_header> cylinder </col_header> </cell> <cell> 549 cc <col_header> capacity </col_header> </cell> </table>
The ​4 ¹⁄₂ hp had a single-cylinder 549 cc.