The Primo Vantage has a lot of rubber on them. They weigh in a tad heavy but they make up for that in their ability to better resist puncture. Their thickness make them a little more difficult to mount also, especially if you pair them with thorn resistant tubes. That said, I plan to stay with these on my everyday chair going forward. In the 33 years I've been buying chair tires these have the thickest rubber I've seen. And they inflate to 90 psi for smooth, low resistance rolling.