Jetblack 4 bike tow bar carrier the new jetrack tow ball mounted bike carrier is suitable for all types of bikes from small childrens bikes to full blown downhill bikes jetracks simple design allows for easy mounting and securing of any style of bike through the bungy fasteners and features tough high density foam padding on the tubing for ease of use and protection for your bike easily attached to the tow ball with dual allen bolts the jetrack system is a safe and secure option for your bike