While some bike models last just a couple of years, others change with the times to stay at the top of riders' wishlists. In this new series we're looking at the evolution of three bikes that enjoy enduring popularity with UK riders, each from a different genre of mountain biking. Kicking things off is the Lapierre Zesty, a full-suspension rig that's come a long way since it was launched in 2007 (on sale in 2008).