hi all, I know not the most favourite bike in the world. just after some advice I've done sub 300 miles!!! on the above a 2014 model the rear hub keeps coming loose. I tighten the 2 nuts up as I gather you can't go mad or it squashs the bearings, but the dam thing keeps coming loose! I got the bike from work and I really enjoy riding it. But I'm getting really annoyed with it, it only takes 15 odd miles and it comes un done any tips please thanks!!