I bought a Hardrock Comp Mountain Bike this summer because I wanted something strong enought to take the bump of my commute. The small potholes the few curbs I have to climb etc. Then this week I really started commuting, going the whole way via bike rather than drive and bike combo.

My bike has knobby tires. I rationalize to avoid the glass and flats that I assumed would occur more quickly with slicks(?). Now I am wondering how much speed am I losing with the knobbies? I covered my 12 mile commute in 41 minutes this morning.

My question is this, would slicks offer me more speed, how much more, and still hold up against the debris that we all encounter on the road?