What brand is this logo? Can anyone identify this?
The headbadge says K2. Here is the K2 website
That's the logo for K2 Bike - the sticker above is probably a retailer sticker. K2 Bike was started in 1998 after the K2 organisation decided to merge their Ski, Skate and Bike brands under one brand. The bike brand was a company that K2 had previously bought called Girvin Mountain Sports who sold the "Proflex" range of bikes.
(I was at the launch party!)