Thanks.. loved my Arkose SS. And correct, yes - the Dolomite's not in the 2019 range, Arkose with 30mm tyres was doing a better job for many of us. The Arkose has more potential with bigger tyres so we split the range into Arkose Road and Arkose Dirt. Same frameset, just different parts.
Think dolomite disc is being phased out. Reasoning being the 2019 arkose covers both bases. @jameso ? I had an Arkose singlespeed. Ace bike.