I recently bought a second hand Bianchi mountain bike as a second bike to mess about on off road. It went in to the local cycle shop to have the shifters & gear cables changed & an adjustable stem fitted. I bought some Land Cruisers which I fitted yesterday. Now, I have fitted my own tyres many times before but this time when I put the front wheel back on I have a wobbly wheel no matter how much I tighten the quick release. Also the back brake feels rough when I pull the leaver. Any ideas what I've done?