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Nope, the Vigorelli which is stiff as the proverbial upper lip. I'm not a track sprinter by any stretch of the imagination but I've always found the Planet X track to be pretty stiff, at least compared to the wet noodle that is the Stealth.
I'd be riding steel all week with slow tyres so going back to something light(ish), stiff with fast tyres and tubes felt incredibly fast going uphill. There really is nothing better than climbing on a lightweight fixed with the right gear.
Awesome! Was the butchery conceived on the PlanetX & did you notice any PlanetFlex on your stompsation?