Originally Posted by roadwarrior

LOL...a friend of mine had a popping sound when the cranks hit a certain spot. He could not figure it out, so I rode the bike. Originally I thought it was the seat post, or seat...stood up it stopped. Sat down, there it was. Pulled the seat post, did the whole deal...popping still there. It was the bottom bracket.

Cracked me up.

Speaker membrane...LOL.