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@gbj_tester
Looks like a re-branding of the old Ultra Speed (slick, 220tpi Nylon, no breaker). I use the UltraSpeed for time trialling, and have ridden them at Calshot too. Very low rolling resistance and enough grip, but they are probably best kept for racing as the tread is very thin, so you won't get a huge mileage out of them on outdoor tracks.