Im now 14 but i used to have a 125cc monkey bike like a year or to ago and they arent that fast but they are comfemterable, they handle nice,there easy to ride,extremly reliable,but there not dangerous as long as you know what your doing....But if your 17 i would reccomend a bigger bike like a yz,kx,cr,rm125 or a 250f....good luck=)