+1

The wheelsets of two of my bikes are very light, and within a few grams of each other. Both bikes--one just under 20 pounds and the other 28 pounds--climb about the same, which is to say goat-like.

My third bike, the Portland, goes from being a reasonable although not stellar climber in the three seasons, to having to granny up even modest grades with the studded snow tires on. The three-season tires are 250 grams each, and the studs are 875 grams each--or about 2.75 pounds total difference.