I have a Cannondale Quick 5, which I use exclusively on the road. I chose it because I wanted the flat handlebars, but otherwise wanted as many road-like features as possible. The bike has a triple crankshaft (48/38/28) and 8 gears (32-11) at the rear. I installed clipless pedals.
The bike came with rims that fit 700c tires, and the dealer threw in a pair of 38mm tires, which I understnad is narrow for a hybrid but wide for a road bike. I am contemplating putting on true road tiers. What is the smallest I can go without changing rims? Should I change the rims too? Will I notice a significant difference in rolling resistance?