Chances are your very first bike tool was a 4, 5 and 6mm Park Y-Allen wrench. It was mine, purchased the same day as my Silca floor pump, both of which I still have. I spent slightly less than $40, which seemed an extravagance given that neither item could be ridden. As a relatively new cyclist I had a lot to learn about what constituted necessary. The bikes most of us ride have changed a lot in the last 10 years, let alone the last 20 years. Some of these changes—better-made clothing, improved hood and saddle shapes and more sophisticated shifting systems—have made incremental changes to our riding experience, but other changes—namely carbon fiber—has changed the cost of bikes and the care required to maintain them immeasurably.