1. Symbols
1.1. Bicycle
1.1.1. So how this symbol connects to the deeper meaning is (DM~ Getting Older and leaving the house) When you start to learn to ride a bike, your parents are always there to guide you, same with when you are young, and as you get older you start to stray from your parents not needing their help as often, and your parents just keep their distance and help you when you need it, "I kept waiting for the thud of your crash as I sprinted to catch up" And finally when you learn all you need to know you leave your parents behind and go on and live your life "The hair flapping behind you like a handkerchief saying goodbye"
2. Meaning
2.1. Surface Meaning
2.1.1. Learning to ride a bike
2.2. Deeper Meaning
2.2.1. Getting Older and leaving the house
3. Evidence
3.1. Analysis
3.1.1. So in the first line "When I taught you at 8 to ride a bicycle" and the last line "Like a handkerchief waving goodbye" These two lines are basically the start and finish of her childhood, first learning to ride and at the end being able to ride alone.
3.2. Imagery
3.2.1. When you read the line "Like a handkerchief waving goodbye" you can picture two things 1. Her actual hair flapping behind her like a handkerchief waving goodbye" or 2. You can look at in a different way and see This like she is saying good bye and leaving her dad behind.
3.3. Structure
3.3.1. There isn't much white space so I guess the author wanted it to be quite fast and up-beat.
3.4. Words Choice
3.4.1. "When you grew smaller, more breakable with distance" The Author means that when you get further away it will be easier to lose that person.