Headset and head tube problem

[martin46]

Tried to fit a NOS Tioga beartrap 2 headset into a NOS Haro frame today and it was not having it. So i checked the diameters and to my surprise the internal of the head tube is 32.1mm and the external of the headset cups is 32.6mm  I would say there's not much chance of it going in. Anyway i have a mate with a tube reeming kit, so nipped round to borrow it only to find that it only goes out to 30.5mm which he assures me is plenty for doing standard/early roadbike mtb frames with 1" threaded steerers. Now im completely stumped.
Anyone else come across this issue and any ideas what to do or where i might get it resolved?

[pkripster]

What sort of haro frame those headsets usually fit 87 88 and 89 I'd say

[martin46]

What sort of haro frame those headsets usually fit 87 88 and 89 I'd say

Its an 89 Group 1 RT

[oldtired]

is the frame and the headset painted ,  powder coat can be quite thick ,   could account for the difference ,    1" road bike headset is smaller than whats considered 1" bmx  

[martin46]

is the frame and the headset painted ,  powder coat can be quite thick ,   could account for the difference ,    1" road bike headset is smaller than whats considered 1" bmx  

Headset is chromed, so is the frame. inside headtube is bare metal though.

[oldtired]

seem to remember there being two size headsets available ,       maybe someone can confirm?     both those sizes look right