You will need to shorten (sorry) lengthen your stem by approximately 45 mm. As above said, the conversion depends on brake type. We have toured many years, my stoker removed her drops within the first year. I never understood the reason for stoker drops. I hardly ever used the drops, so when we replaced our santana with a new custom bike, we went for slightly angled-back flatbars, ergon grips and GP5/GP3 bar ends. I wish I changed years back. On windy days, the reach on the bar ends approximates drops. The wider bars are more comfortable and stability is better, especially when fully loaded with front panniers. The mtb brake levers allow quicker and stronger braking.