A Smooth Ride.This space-saving Saris bike track mount unique design allows you to transport up to four bikes safely and securely, making it great for weekend biking outings with family and friends. Easy to move or remove, the 47-inch aluminum base simply lays on the floor of your SUV or van or in the bed of your pick-up truck. The Saris Single Trap is designed to be used with Saris Traps (fork mounts) and wheel holders, which can be bolted straight into any of the three slots, or angled across two slots to mount four bikes side-by-side and still have handlebar clearance.Simply lay the 47" L device inside car bike rack track on the floor or cargo area or mount it to the wall like a team sprinter van. Any way you mount the bike rack inside car, your bike will be carried safely to your destination so you can tear up the trails with it, so add these to your track system accessories.