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@Smallfurry
hmmm. kinda thought mine was 45mm. It definitly tapers a touch. My new bear cover is a tad too wide.
I'm 90% sure its this headset in both mine and Dans bikes. 41mm bearings, 45mm headtube.
http://www.fullspeedahead.com/storage/insidetech/items/EN_cd23382e-7b8d-489f-8172-234f31524569_Orbit%20IS%20Carbon.pdf