We are planning to buy an older Sears single speed adult tryke for pleasure riding out here on the country roads with little traffic. My question is how hard is a tryke to pedal considering they are much heavier than a bike?. I know my old single speed 26in. bike will give you a workout on the slightest hill I dont want to find myself standing up or pushing the tryke half of the time. Most of where we will ride is fairly flat.