Joined: Jul 2002
Posts: 40,863
Likes: 3,115
From: Sacramento, California, USA
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
As others have said, it's not the distance, it's the hilliness or windiness of your commute. Pick a reasonable gear ratio (65 to 75 gear inches, say) and you'll be fine.