Seatpost was rubbing on the frame (my fault, mudguard was resting on the frame and occasionally blocked the post from being fully lowered). I've noticed the paint has now been chipped, but was there always meant to be a dent in the frame where the seatpost goes down?
2025 C Line 6 Speed (more like zero speed when my slow ass is riding it)
by AllergicToMyLandlord