I am in my third month of cycling, after 30+ years of absence. I now try to maintain a habit of going for a one-hour every morning, around 10 miles. I noticed that I am exerting much more effort and going much slower than pretty much every one else on the trail. Don't get me wrong, I am ecstatic to be moving and cycling, but I am wondering if the slow and extra effort is because of my being very out-of-shape, or because of the bike (I have a cyclocross Giant TCX 2), or the tires.
The tires are 700X35 and they are knobby. I like them since the trail I ride on had a lot of cracks, and it is crushed stone in certain reaches. So the tires dampen the bumps a bit, but since I don't have a basis for comparison, I wonder what would happen if I would get thinner tires. Would I be able to go with less energy exerted? or would I end up with a flat every day because of the thinner tires? Would the thinner tires be a disadvantage during rain and snow?
Many thanks in advance.