I have issues on my #bike lately.
I hear a strange noise when i move the pedals while riding, but not when i don't move the pedals. The noise isn't constant, maybe for 2km there's nothing, then for 1km i have it.
In today's #commute i rode with the offroad tyres. I can exclude is the freewheel because i still have it.
Remaining checks are:
Bottom Bracket (my bet)
I rode just 1500km mainly on tarmac. No muddy road and i did standard maintenance. That's strange.