Well, it sounds better than saying the "two thousand and ten" bikes doesn't it ? "Oh-ten" or "twenty ten" sound much better than "two thousand and ten". And when it comes round to 2023 people will probably say "twenty twenty three" instead. People call the 2001/2002/2003/2004/2005/2006/2007/2008/2009 bikes "Oh-whatever" so why not for the 10's ? I mean, nobody calls the 2012 olympics the two thousand and twelve olympics do they ? No, they all say twenty twelve...