Headset bearings for Giant Defy 2

Smuggs

Active Member
Hi all,
I ‘be just stripped my headset bearings on my 2016 Giant Defy Advanced 2 bike, only to find I am missing some ball bearings in the bottom bearing set.
i think the bike takes an overdrive 2 road bike kit MH 137 bearing, which I could buy, but would prefer to just replace the ball bearings and reassemble.
can anyone advise on the size of ball bearings I need?
many thanks
Smuggs
 
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