problems with new bike
 

alright so i got a new trek madone with ultegra on it with a triple in the front and 10 in the back. whenever i start putting pressure on the pedals or just start going over 20mph, it makes this grinding noise. normally the noise wouldn't bother me, but i feel like im losing a lot of power. i've checked both the derailleurs and those are adjusted fine. whats the problem?

You run this back thru the Dealer first ? What did they say?

how the heck can you hear a grinding noise at 20 MPH on a bicycle?
just the the air moving past your ears is plenty loud.

do you have a stethoscope and a long set of hoses to attach to parts of the bike?

or a contact microphone to attach to your ipod to record this ?

Since it's both new and pretty expensive, you're entitled to have the dealer make this work to your satisfaction. It's possible nothing's wrong and you're just hearing normal drivetrain noise, which can vary depending on the rear hub, chain or cassette, and which can seem louder on carbon frames. Or there might be minor adjustment issues which the shop needs to resolve.

That said, and consider the source here (I sell chain oil) you might simply be hearing more noise than necessary because of your or the shops choice of chain lube, and how it's applied. If it doesn't need adjustment, consider switching to a lube known to make drivetrains quieter, and apply it properly so it can do it's job.

what would you suggest for a type of lube?

If you visit the site, you'll see that the stuff I make is a heavy oil, which isn't thinned with solvents. IMO, only heavy oil type lubes are suitable for today's narrow chains who's moving joints are more high loaded.

There's lot of opinions about what's best for chain lube, my stuff was designed around my opinion of what works best. If you want other opinions about it, you might google "chain-L reviews".

Be sure that both wheels are fully seated in the dropouts.

+1 New high end bike, take back to the dealer now. Diagnosing problems in person is usually more successful than over the internet.

If it's a new bike the lube that is on the chain is good for about 1000 miles. http://www.sheldonbrown.com/brandt/chain-care.html