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umop3pisdn-
Pretty sure the Supersonic is a track tyre in Conti's eyes, which is why they make the GP TT.
Ah yeah, when I search for the tyres, it's listed under Triathlon/TT, but description said;
This tyre is intended for race use only in solo events on the road or as an all-round track clincher (indoor & outdoor).
edscoble
Because they're aimed for TT.
If you want to go faster, get bigger tyres and run a much lower pressure than you think.
The Conti GP 4000s is the idea choice for UK road and condition.