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I am riding from 54 up to 58!
The Leader AX in yellow is a 54 with a 110mm stem I think,
the Olmo is a 54 with a 120mm stem while
the Somec is a 56 with a 100mm stem and, lastly,
the Holdsworth is a 58 with a 90mm stem!I think 54.5/55 is my correct size with a 100mm stem. So this might fall perfectly lenght-wise. My only worry is the height. The Leader AX in Bugno colors I had recently was a 58, but due to the way the seatpost works, you need to add a couple of cm to the minimum saddle height and, in fact, on that one I could barely touch the pedals!
Thought you were riding 54 cm frames these days? You might at the very least need to shorten that stem...