Well i couldn't be bothered to get a rear tentionar(almost everyone i meet dirt jumping says they break) so i decided to try and use the box guide thing that came on the bike, along with a half like chain so i didn't have to adjust the guide wheel so much. When i reassembled after mucking around with the guide wheel for the umteenth time, I forgot to put the box back on but it works a dream! And i do agree i wouldn't mind a better rear brake, thought about running the front one through the headtube? So i still have the freedom of one cable. Thanks for the comments, Chris