Creaking bike = cracked rim?

[raleighnut]

Because the rim join is corroded in that way I'd ask em to check it, some rims have a joiner in there some are just butt welded together.

 

[Sbudge]

If you've lubed the spokes I think that can be eliminated. My thought would be the seatpost or saddle clamp (as already suggested above). Something less likely but which I've had myself is the rear wheel quick release not being seated/tightened quite right.

I can definitely second that opinion. Had a very annoying creak that seemed to only come when putting a lot of weight on the pedals. Turned out to be the QR... Took ages to find though.

 

[Globalti]

TBH that rim joint is pretty corrroded. I bet the rim is full of water - do you ride in all weathers and on salty roads? If that's the case it's likely that the nipples are corroded to the spokes and the tension can't be increased. If pressing down on both sides of the rim with the axle on the ground produces creaks I'd say the spokes do need tightening or there's a cracked flange. Get it inspected by a mechanic at a decent shop, not at a bike supermarket.

Have you also inspected the frame carefully for cracks?

 

[Smokin Joe]

Have you also inspected the frame carefully for cracks?

Go on, really worry him now

 

[nappadang]

Go on, really worry him now

I did have a minor cardiac arrest at this thought.
It's in LBS I'm awaiting diagnosis and more worrying, the price of repair.