Depends on your focus, really.
If you race, then rotational mass and rolling resistance is going to make a huge difference, or if you are riding ultradistance (Century +). Otherwise, it's more or less a wash. Properly inflated, there isn't a huge amount of difference in wide vs narrow tires, in the long run. Different job, different wrench.
Originally Posted by
Alathea
Is rolling resistance REALLY an issue if you are a clyde? I mean, we are already pushing weight around, is a few ounces of tire weight going to make that much of a difference? Am I missing the point of 'rolling resistance'?