text: how can i center my bike tire very precisely so my disk breaks don't rub? i got a new bike with disk breaks since i do a lot of road riding, but it's a hybrid because i do some trail, so it's got a mountain bike frame.  anyways, i'm having a real hard time getting the front tire centered really well and it seems like my front disk break keeps rubbing the tire at one point.  i can get it nice and centered sometimes when my quick release is off, but as soon as i tighten it, it gets off again.  are there any special methods or tools that people use for this?  the gap between the disk and the breaks is so much smaller than the old rim breaks on my previous bike. like one of them said tighten both nuts up at once and you can also adjust the brake pads ... there should be alan key nuts if you have a look and you can loosen them of