I've recently purchased a MadAss 125. It is my second bike and I use it to get to work and back home. I've brought it brand new and have done about 300 km. Today... on the way to work, I felt it wobble. I've pulled over a few times to check and finally decided I'll ride it to the bike shop to get it checked out. as the wobble got worst and worst... I pulled in to small streets to go through the back way to get there. Thinking that at lower speed, less traffic, I'll be okay if anything happens. about 500 meters after that.. the rear wheel locked up. I then realise it was caused by a missing axle nut. the axle have move out of its socket and caused the back wheel to lock. ](*,) I then contacted the shop... it took them a few hours... and finally got it picked up and fixed 7 hours later. :angel: When the mechanic showed up, he immediately said someone had tampered with my bike. he said it is a self locking nut and it does not fall off by itself. It's a bit hard to believe, as I've only just move to this apartment block. I've only parked the bike in the garage or outside work. Only after I was riding home.. I realise, some of the weird noise that happens at certain speed is not longer there(sound of lose chains). Thank god, that I didn't hurt myself because of it. but what I want to know if its possible for the axle nut to become lose itself. I've also noticed, both in the owners manual and prior to today, the axle are inserted from left to right. After the shop have worked on it today, it's now inserted right to left. Does this have anything to do of how a "self locking" nut work? Do you think they sold me a bike with lose nut?