4000 and 4000s, no probs for me
I have been riding on GP 3000, then 4000, then 4000 w/black chili, and now 4000s (also w/chili, yes, a few bucks more but I like the appearance of the tire's lettering better on my bike), for many many years. Other than an occassional flat (only one on my last 3 (I think 3, maybe only 2 sets, can't remember) sets of 4000s, a small wire got through the belt), I haven't had any problems. Did use a Michelin tire, can't remember which, for a few years, many years ago, but Conti's for many years now. In fact, in 40,000+ miles of riding (all but one year (Rhode Island) in the Kansas City metro, almost all riding on the Kansas side), I have never had a sidewall blow out, or cut, on any tire. I am fortunate to be able to ride on pretty good, pretty clean, roads. I am 6'3" and have weighed between 190 and 215 over that time (almost 20 years).
I find it curious to read about some posters that have suffered cuts on Conti tires, and some of which comment they will go to Michilen Pro3 Race tires -- I seem to have read on a post in this forum, recently, that many users of those tires have been suffering cuts on sidewalls. Probably just a consequence of the roads and road debris various riders have to endure.
Back to the Conti's, can I tell a diff between the 4000, 4000 w/chili, and 4000s w/chili, probably not, I just usually ride the latest / greatest Conti (also rode Attack/Force for a while too) that is offered, and they have all been great tires for me. I usually get only 2000+/- miles out of a set, I just figure that is the way it goes, being a bigger rider. Compared to gas costs for my car, not much to pay, really, in perspective to life and cars and my bikes.
Doug