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Thanks all for the discussion. Lot of interesting points made.
I did the balance test with the bike in question and the elbow angle. The existing stem supports those two reference tests.
Based on the discussion, I would be surprised if 10mm makes a difference. I have several "race" geometry bikes that are all slightly different dimensions from 58 to 61 ctc st. Most are square or within a tolerance measurement of one. I would like to replicate fit on all the bikes but have a limited number of stems to choose from. This small difference, if any, allows for using the existing ones.
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