Other's views will vary, but I've given up completely on CO2 carts. They won't inflate my 35 or 37mm tires past about 60 psi, and there are a lot of thorns around here. I've had as many as nine flats in a 100-mile ride. I carry a 30-year-old Zefal frame pump or a newer Topeka (Road Morph, I think). The Zefal has surely inflated hundreds of tires and still works like new.