Yes, the 'dents' are for crank ring and heel/crank arm clearance. I was just teasing earlier when you were wondering as to the durability of your aluminum frame. Looks like you have a steel front fork unless what I'm assuming are a few surface rust spots are grease or dirt. If I recall correctly, the 1990 model year switched to aluminum front fork. Nice looking bike; that Crit frame may be a bit twitchy until you are used to it, but it is super responsive and can accelerate like no one's business. And again, have no worries about frame strength. I'm riding a 63cm version and its held up to my abuse more than admirably. Enjoy the ride!