Bottom bracket threads issue

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Technics100

I was wondering if anyone can help. I recently bought a frame and it came with a Campagnolo Athena BB marked as 1.37" X 24 tpi.. I want to change to a Shimano Hollowtech II BB and cranks.. am I right in thinking it's Italian threaded? I bought a Shimano one off eBay but the diameter is too large.. can someone tell me what BB to order?

Thanks

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3c70 in reply to @Technics100

Italian bb threads are clockwise on both sides but bsa is counter clockwise on the drive side and clockwise on the nds. You could use that to quickly check what the original is.

Or measure as above suggestion. All good!

Edit: but it does sound like you just need a bsa bb

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