My daughters track/xc coach asked me to teach him about his bike.
We completely disassembled the bike, found a loose cassette, both brake calipers loose, brake pads worn and BB bearings needing replaced.
He seemed to have fun doing the work. Later in the week we will reassemble and he'll learn to set up and adjust everything plus wrap the bars.
Untitled by
flog00, on Flickr
Untitled by
flog00, on Flickr