back before mountain bikes were commonly available, we used to ride our racing bikes on dirt and gravel roads all the time. I remember one time having my bike sink into the mud up to the bottom bracket. That being said, I'm riding my mountain bike because it's the most durable. And also when I rode my vintage touring bike in last time, someone left a note on it wanting to buy the components. I figure other people might skip the note and just use an allen wrench instead.