In reply to johnl:
About the stickiness of stealth C4.
I could agree with the people who say C4 is the stickiest but then we are both wrong.
What I know and feel and even hear! there is a big difference in Stealth C4 now. The American C4 was sticky. But the new C4 stealth (Chinese) is in fact … quite hard and less sticky (N=1). One can even hear the new C4 placing my foot. Reference is my old American Pinks and my new Chinese Pinks.
Properties of the new rubber can be found on the Internet, if you search well, what I did once.
Easier to find is information of the rubber used by UnParallel shoes which seem softer and may be stickier then the old as well as the new C4.
https://www.unparallelsports.com/wp-content/uploads/2019/08/Unparallel-Rubb...
By the way; the CE mark – as we know – says the product is conform the Conformité Européenne. Not to confuse with the Chinese CE “symbol” what means Chinese Export.
I think the shape, stiffness etc of the shoe plays also an important role how good a shoes smears or edges.