This will probably be too little to go on, but I’ve been racking my brain for a year trying to remember a book I read when I was in middle school. It was YA and from the late 60s or 70s. It may have been a bit more of a pulp paperback than YA, but it was definitely geared towards young readers. It had an urban setting and there was a racial understanding component to the plot. I think the protagonist was white and he ended up befriending an African-American classmate. Almost anything else I try to remember about the plot (was there gang tensions? were they accused of a crime and had to hide out?) then convince me I’m remembering a different YA novel I read around the same time. The one thing I do seem to remember is totally pointless and trivial, but the main character sees the girl he likes in a corner store and causes her to lose her balance by knocking her in the back of the knees. I know it’s not much to go on, but I’m open to suggestions and guesses. Thanks!