Having a real problem with my 2014 Kona Unit singlespeed. I have ~10,000 miles on it based on Strava so it gets real use, but primarily on the streets, not the trails.
About 6-8 months ago it developed a creak. Or more accurately a series of creaks. I have been replacing components but am running out of options. Here's what I have replaced so far:
Front cog
Rear cog
Chain
Bottom bracket
Pedals
Rear freehub
The creak comes from the rear half of the bike. It is not the seat post, it happens if I stand. If I am pushing hard up a hill it does not happen, but only happens when I am pedaling. Here's the weird part: I get on the bike and start riding, it is silent. At about 15 miles the sound starts, by 20 miles it is awful. Then the next morning, I start riding, silent again.
One of the last things left could be the rear wheel. If I want to see if it is the spokes, I know I can put some drops of oil on the spoke holes of the hub and where the spokes cross each other. Going to try that.
Any other options?