Andrewh is correct in stating that if the toe in on the trike is not set correctly, it will make pedaling it MUCH harder. You will also find out that the tries can wear out in just a couple hundred miles instead of several thousand miles. One not very scientific test is to let the trike go on a very slight incline. It should start on its own and roll down the incline and gain speed as it goes. The best way is to measure the toe-in with a homemade tool but the technique is not always simple and varies from trike to trike. Once correctly set, the toe-in should be OK for a long time. The other factor is that you did not buy a trike designed for road riding. KMX trike were specifically designed for off-road and will stand up to the abuse resulting from off-road riding. Trike weight, design, bearing quality, tire design, gearing, and your own fitness all are factors in how easy it is to ride. The good thing is that the more you ride, the easier it gets no matter which trike you own.