"Computer is bicycle for the mind."

Now, fill in the blank: AI is ___ for the mind.

My answer is "race-car," but there might be better answers.

This is prolly the best answer tbh given the context in which Steve Jobs have that bicycle metaphor, and what the Scientific American article he referenced was looking at 

https://www.bicyclenetwork.com.au/newsroom/2020/05/07/bikes-make-humans-better-just-ask-steve-jobs/ https://i.imgur.com/XQ6G7xw.jpg

a jiraffe on the internet • nf.td/morereese

Yes, I'd say it's bicycle with additional things (AI isn't a standalone thing, it requires computer to run it).