^ oops, thats just the lower, this is what you need;
http://www.ebay.co.uk/itm/Acros-AI70-Headset-Bearings-Upper-Lower-as-found-in-many-Canyon-Bikes-/201555260934?hash=item2eeda13606:g:cTYAAOSwsN9XAp0~
Was actually only the lower I needed (top seems smooth still) - but might as well get a full set for future replacement
@woods_alexis started
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^ oops, thats just the lower, this is what you need;
http://www.ebay.co.uk/itm/Acros-AI70-Headset-Bearings-Upper-Lower-as-found-in-many-Canyon-Bikes-/201555260934?hash=item2eeda13606:g:cTYAAOSwsN9XAp0~