PRESENTLY USE DAHON FOLDING BIKE! TRIED TO USE MOUNTAIN BIKE TODAY. FELT UNSTABLE AND UNSURE. I ONLY USED FOR A MINUTE> WILL I GET USED TO IT? FEEL UNCOMFORTABLE! IT WAS QUITE HEAVY TO RIDE, OR SHOUL DI SAY REQUIRED A LOT OF STRENGTH VERSUS DAHON. USED ONLY FOR MINUTE. WILL I GET USED TO IT. DIFFICULT TO EVEN START? FELT SHAKY. P L E A S E H E L P!