I was having quite a lot of issues with this bike, all related to creaks and the flexy handlepost. So much so that I got sick if it, boutht a minivelo and was going to sell the mu. But after many attempts at solving the issue I decided to totally strip down the headset. Found that it looked fine but the bearings didn't turn. Ok...

So a new a new litepro headset later and the bike is great again. Silent running and a solid handlepost. And just to punish me my new super expensive minivelo is now making creaking sounds... Bikes hate me.