I have a ADHX and a ADHX45. If I could only choose one it would be the 45. Event though they are similar in geometry that small difference makes the 45 more stable. For tires I use 32mm Rene Herse Stampede Pass and for gravel I use Rene Herse Corkscrew 44mm. At one time I thought my Trek Domane was the best bike I ever owned and that was until I purchase the Time frames. Now the Domane sits on my trainer and I ride the other two.