What is the fine-grained topic of the following text: Among the changes over the 2009 model are new graphics and colours (still anodised), a higher geometry, a lightened and redesigned tensioner, new dropouts to make removing the rear wheel easier, a new heat-treated fork and a whole range of UN components (rims, cranks, hubs, freewheel). Only return the topic.
2009 model bike upgrades