Originally Posted by dmanthree

I rode the 4000 ii for a few years and liked them. The 5000s are better in every way save for one: durability. I did flat the older tires occasionally, but the new ones, well, two blowouts in the first 400 miles? Too delicate. Which is a shame, too. The GP 5000 rides like a dream, handles well, and rolls really nicely. But there is no free lunch.