Bicycle inspection

I went to inspect my bike on Saturday. To my surprise, my bike has been in use for 5 years, so the keys were not working properly.

When I went to the bicycle shop, it was crowded. After waiting for a while, I gave my bicycle to the bicycle shop. An hour later, the bike came back. I was impressed by the smooth movement of the keys! 

I would like to continue to use it carefully.

Thank you for reading!