I've been meaning to write about these tires for a while - I received a set last summer from my Continental Sales Rep, Adam (back in Tennessee) and then neglected to mount them on any wheels before moving to Oregon. Well, Oregon winter weather came and went - spent on my favorite winter tires from Michelin - and I've now switched back to using my Bontrager Race X Lite Aero wheels; on which I had installed the 4000s'.
I've spent a lot of time on Michelin tires - which I love; but I don't really like the break-in time required to scuff them in and wear off the waxy residue on the rubber. I've never had that problem with and of the Continentals I've ridden. I can install them and immediately go take a nice, fast, aggressive descent and not hear the "chirping" sound that I've come to know as my new Michelin's skip through a corner. The Continental tires bite the pavement beautifully in a loaded corner from day one and the 4000s iteration is no different. In fact, in the 250+ miles I've ridden on them so far (with plenty of high-speed, twisty downhills) I have yet to find their cornering limit. I can't push these tires hard enough through a corner at 40+ (or a tight hairpin at 25-ish) mph for them to let go and make me wish I hadn't done that. I'll attribute this to Conti's claimed 30% improvement in grip. Hard to measure exactly - but noticeable in cornering confidence.