Exactly. And I have quite a bit of experience with mountain bikes, living in a hilly town. Cheapo mountain bike wheelsets/tires can easily reach 5000 grams total weight. I had one of these on one of my first bikes. Switched to a sub-2000 gram wheelset with light tires, dropping weight close to 4 pounds. What a difference climbing made. I imagine road wheelsets might not be quite that different.