The Conti tires are great - but the Race Sport versions can be a challenge to find
Oh... Jusk checked with Continental UK, these are discontinued already. My advise for everyone to grab a pair if you can find one. If not, why not to go for the next one in the BijeRollingResistance table?
Thunder Burt Super Ground Addix Speed
Here is the link to the table again:
https://www.bicyclerollingresistance.com/mtb-reviews