and to

The X its a tarmac eater, and well ridden will leave behind all the pocket rockets on twisty roads because it eats corners like pacman.

The R is the X's evil twin same performance as the X on tarmac but with the added ability to do on rough what the X has limits, (i.e. road tyres)

The Z on the other end is the R and a lot more but you need to be quite a tall fella to climb on it.

The Z is also the best seller of the 3 since it was launched in 2008