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I am using one to solve the same problem. It will work fine with an EC44 lower cup and 1 1/2" crown race on a straight 1 1/8" steerer. Think you are getting confused by the metric to imperial conversion and the dimension of the crown race shoulder at the bottom of the 1 1/8" fork (which is 30mm dia).
The alternative is to use a ZS44 cup, but think it depends on what the frame was designed for.
I looked at this initially, but it means the fork is effectively 15mm shorter as the ZS bearing sits inside the 44mm headtube as opposed to the external cup of the Ec44 and I didnt want to lose that length/negative handling effect.BTW the HS136 is a VERY tight fit on the fork 30mm crown race shoulder. The trick is to put it in boiling water first to expand it. It will then contract onto the fork steerer to be a very snug fit.
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velosaurus
But thats from 1.5" to 1 1/8? I would need one from 40mm to 30mm. But I dont really like adapters. Thank you, though!