I swapped from a 100mm/+17 degrees to a 110mm/+17 degrees stem when I went from Mark's drop bars to the Map/Ahearne bars, and did not change the spacer height (20mm). I like the bars a lot, and with my increasing lack of flexibility am much more comfortable with the upright position. Suggest you get the wider MAP/Ahearne bars if you mount shifters and brakes on the bars.
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