had this a million times and still have it, but it can be from a few things~! 1. could be pedals, about 3 weeks ago i had a creaking sound... wasnt sure what it was... turned out it was the bearing in my right hand pedal being crushed and my pedal wobbled a bit... then in a ride i did a sidehop, messed up jumped down but my pedal body was left on the wall lmao! and axel still in the crank arm. i have creaking from almost all of my pedals lol i jus ignore it now haha 2. bb one time i jus cleaned my bb and the creaking went.. the end happy another time (different bb) i went to clean it and have a look, turned out there was cracks all over the place .. bin! 3. make sure you cranks and everything are super tight! cus it can come from stuff just being loose lol but my bets are on the pedals that seems to be the most common, see if they wobble a tiny bit on the axel (so the axel stays still but the body wobbles) when this happens dirt can get in and its the dirt being cruched that makes the creaking xD