annoying creeking

Both my road bike and my mountain bike are fairly new and expensive.. but both are giving me a right head ache with strange creeks.. from the cranks.. the handle bars and the chain.. I need advice on how to service them.. does anyone know of a good source of infomation on the art form?

 

Sometimes the cleats on shoes are the cause of creaks. Are you using the same bike shoes on both bikes? If so try tightening them, at least that is the easiest first approach.