Anyone know the name/code of the bearings needed and where I can source a set?
Photo for reference:

Gt I drive 2005 by JCcreative, on Flickr

Off the top of my head I remember reading they were bearings out of a headset? Take them out and if they’re sealed cartridges there’ll be a code printed on the seals.

Thanks, will try that if noone else knows the part ( the problem I’ve got is its not my bike and I’d like to get the parts before he brings it round so I can swap the bearings out and give the bike back the same day as I’ve got nowhere to store it whilst I wait for parts to be delivered.

BETD do full sets
http://www.mountainbikecomponents.co.uk/items.asp?CategoryID=393&Name=GT+Bearing+Kits