SPD-SL really worth it over SPD from a scientific standpoint
I have my SPD pedals and gravel-shoes for a while now and I installed them on my new roadbike because I am fine with them and I really like the ability to walk normal with my gravel shoes.
Now, I have to look for new shoes and for a while now I am thinking about getting SPD-SL cleats for summer.
So the optical things aside - how much more efficient is a spd-sl pedal? I know that it has bigger contact surface - but is the gain really measurable in watts? Is it really worth it? Is there some scientifical standpoint for this where someone tried to measure it?
I mean, on some side is has to be, right? Otherwise I would not understand why everyone is using shoes with cleats you can not really walk on. :-)
And yes, I just choose what I am happy with and I dont feel preasure to buy something just because others have it. I am just curious and I like to test different things to gain experience.