Rutland we are spoilt for choice, but two great circular routes are:

Oundle-peterborough-B660 to Kimbolton, B645 to Raunds then Old road to Islip/thrapston and back to Oundle

Oundle-corby-Uppingham-Oakham-stamford-Barnack-peterborough-Wansford-elton-oundle

or a longer one.
Oundle-corby-uppingham-Market harborough B664-Melton mowbrey B6047-saxby B676 but right to Wymondham-Foss lane-Market overton-cottesmore-barnsdale lodge-stamford-barnack-peterborough-wonsford-elton-oundle

All have good pubs on route and all are criss crossed with other good roads. If anyone is ever over here shout as i do love a road trip.