The bottom bearing on my road bike has seized I took it out and it says on the side 52x12x45 but I can't seem to find a corresponding size on any websites.
I know I could email a supplier and ask but you get a faster and more accurate response here. IMO.
[i]more accurate response here[/i]
Not for headset bearings, there a complete bugger, normal bearing supplier dont tend to stock the type of bearings we need for headsets, that have an angled upper and lower contact surface.
I'd make a wild guess that you need the T808 from [url= http://thebearinghub.com/headset-bearing-models ]this page[/url] but as the supplier behind it hasn't pulled his finger out, getting them from a them or anywhere not from the original manufacturer is a bit problematic.
Sorry, thought I was posting on my headset thread so deleted entry.
The make and model of the headset would help.
Either FSA or Barelli - the finishing kit is Barelli.
Found what I needed here:
Airebearings
http://www.ebay.co.uk/sch/airebearings/m.html?_nkw=&_armrs=1&_from=&_ipg=25&_trksid=p3692