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I read that the old Ones were pretty good on RR and the new were only slightly better. CBA to find the reference now, but the old Ones certainly feel like fast tyres and they are made of soft, thin, grippy rubber, so I'll settle for that.
Not having to pump them up might be worth more time than the RR difference!
frank9755
inappropriate_bike
Ah, they're very different tyres, the old and new.
The old ones are think, high RR and won't leak air.
The pro (new) ones are more supple, thinner (as good PP) (hence loose a little air) and very very low RR.