I purchased a Mongoose Amasa Comp second hand many months ago and I have been told by a bike mechanic that the headset is the wrong size. When the front brake is pulled the steerer or the bearings slightly knock against the head tube.

I have been searching for a correct headset on the net but there are so many types and sizes im completely confused.

I searched the Mongoose web site and it says that the original head set was a Ritchey Logic Zero but I can't find what type of headset this is or what size it is.

Can anyone give me a link to the headset I need or an equivalent? Please.

This isn'y my bike but ity is the same if it helps.

http://www.moredirt.co.uk/ratebike.php?id=5234