What sort of bottom bracket does a Trek 1.5 2011 take? My bottom bracket is on its way out.. No longer getting smooth rotation even without chain attached. I was wondering if anyone knew what sort of bottom bracket the frame supports? I've googled but the results are fairly mixed.

Also I assume I just need a special bottom bracket wrench to replace it, is that correct?

Cheers,
John
From Trek's archives and Bikepedia, it looks like that bike has an FSA Vero compact crankset (no mention of the bottom bracket (BB)).

From the Amazon page for the FSA Vero Compact it appears the crank is compatible with a JIS square taper bottom bracket.

JIS square taper bottom bracket is a common type of cotterless bottom bracket, available from many manufacturers.

You'll need to check that the bottom bracket shell sizing and threading matches the BB, too.

You will need a special tool to get the crank off and another for the BB.

See also: 


Sheldon Brown on Cotterless Crank removal
John Allen on Cartridge BBs
Park Tool on Cartridge BB servicing
Park Tool on BB tool selection
Park Tool on Cranks