Originally Posted by
Sullalto
How's the position? Sitting upright on a MTB is a ton more aero drag than even a semi-upright endurance position. Which will likely make more of a difference than weight. So will rolling resistance on 35mm semi slicks vs 2" knobbies.
Mostly I ride hardpack, and I can do it on 26mm gravel kings. But 40, 45mm tires give me a lot more flexibility about choosing lines and let me carry more speed because I'm not dancing around rocks and ruts.
I'm going to say no on both accounts.
With Aero, this was a 3-hour long solo bike ride and honestly we're doing good to average 15 miles per hour. At those speeds Aero means almost nothing.
As for tires, the mountain bike has the lowest resistance tires I've ever seen, at 10 watts per tire they have less rolling resistance in my Supple 40 mm gravel tires.