Having the correct gear inches tailored to your strength and riding style is all that matters esp on climbs. We have a few Dahons and homebuilt mini velo bikes. My favorite is still the wife's bike with a 30t ring in front and an 11/34 cst on 406mm wheels. I can climb the steepest of hills in the San francisco area sitting down. Spin smoothly and lean forward so the wheels won't lift. I remember an electric bus tailing me one time up Sacramento st from the water to taylor st. Bus driver gives me a thumbs up as he passes me on the summit.
On the downhill, you just have to coast as the gears won't be high enough on a single ring 30t crank. Enjoy the climb