I think all tubulars are foldable?? Anyway I'm pretty sure we're all talking about clinchers. I don't think the 4000 comes in a wire bead version (I just this minute found out it does come in a tubie!), but I could be wrong about that.
FTR, what I run is the 4000, not the 4000S. I'm not really sure of the differences, but I think the "S" is racier, it's 10 g lighter (ooooh!).



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