2005 Dahon Speed TR, 2006 Dahon Mu SL, 2000 GT XiZang, 1999ish Rock Lobster, 2007 Dean Animas CTI
Could it be balance? Maybe one bike is heavy at one end, that would make a big difference in how it feels to try to pick it up. Try to pick up your bike from the handlebars instead of the cross bar. It'll seem a lot heavier until you get it high enough for the rear wheel to swing under and balance the weight....