Surly Steamroller owners...

i think you meant weight in the rotating components.

Hello

Yes it's what I mean, and (important point) in the context of a urban situation where most of the effort is used to accelerate.

I'm no specialist in physics but I don't think the difference in rotating/non rotating part is huge when for example climbing a mountain. In this case, a gram is a gram, rotating or not (even if sometimes to regain some speed the climber has to accelerate).

In urban situation where the main point is to accelerate again and again and again, the moment of inertia becomes important.
And to be precise I suppose that the place of the weight is important. A rim, a tire or a tube can cause a big variation in this moment of inertia, I doubt a hub can.

This is easily verified in real life when using heavy tires (I remember using Schwalbe Marathon Plus on one of my hybrid bikes… the first day it was a huge surprise..)

To this we need likely to add friction , tires rolling resistance, global behavior of the wheel like (lack of) lateral stiffness that can translate part of the effort to a lateral movment instead of a forward movement, same consideration about stiffness applies to the frame itself (highend road race frames are.. stiff.. really stiff...)

The weight is not always the enemy. When riding on the flat out of this repeated acceleration context, it is of low importance, and when riding down hill, a heavier set will go faster.

But at the end, what I wanted to say was just that we can safely love Mr Steamroller even if it is slightly heavier than other frames.

Luc