How to Choose a Hitch Bike Rack: Platform vs. Hanging

Start with your hitch

A hitch bike rack slides into the receiver, the square tube under your rear bumper. Most bike racks fit one of two receiver sizes. The 2-inch size is standard on most trucks and SUVs, while 1-1/4-inch receivers are common on smaller vehicles such as sedans and crossovers. Each rack is built for a specific size, and some models come in both, so measure the opening before you shop. Heavy-duty trucks may have a 2-1/2- or 3-inch receiver. Many hitch racks are not made for those, so check the rack maker’s fit guide.

Next, find your hitch class. It is usually printed on a sticker or label on the hitch itself. If the label is gone, one major rack maker’s guide says a 1-1/4-inch receiver is either Class I or II and a 2-inch receiver is Class III or IV. The class matters because it sets the weight limits, and that same maker caps Class I receivers at two bikes, whatever the rack can hold.

Do the weight math first

Tongue weight is the downward load a hitch is rated to carry. A loaded bike rack is all tongue weight, because the rack and every bike press down on the receiver. Rack makers spell it out: the rack plus the loaded bikes must not exceed the tongue weight specified by the vehicle maker and the hitch maker. Use the lower of the two numbers. Check the owner’s manual, often in the towing section, and the label on the hitch.

Do not lean on a generic class chart. Published numbers vary: one rack maker lists Class III hitches at 500 pounds of tongue weight, while another lists 600. The first maker also tells owners to double-check with the receiver or vehicle maker, since the numbers can change from one vehicle to another.

Distance adds to the load. A rack sits well behind the bumper, and the farther the bikes are from the hitch, the more leverage they put on it. That is why hitch extenders call for caution. One rack maker tells owners to ask the hitch maker about reduced tongue weight ratings when an extension is used, and warns against stacking extensions. Another allows its extender only on Class III or higher hitches.

Heavy bikes and e-bikes

Most hitch racks list a total capacity and a maximum weight per bike, so check both. E-bikes often weigh 50 to 80 pounds. Two of them add 100 to 160 pounds before you count the rack, which can use up a smaller hitch’s rating fast. Rack makers point e-bike owners to racks with a higher weight rating, ideally with a loading ramp.

Not sure what your bike weighs? Step on a bathroom scale while holding it, then subtract your own weight.

Platform vs. hanging racks

Platform racks hold each bike by its wheels, with a clamp or arm to keep it in place. Nothing grips the frame, so they suit almost any frame style, from step-throughs to carbon road bikes to full-suspension mountain bikes. Check two specs in the listing: the maximum wheelbase and the tire-width range. Fat bikes run tires about 3.5 to 5 inches wide and need wider trays, and small kids’ wheels need trays that can hold them securely.

Hanging racks carry bikes by the frame from two arms. They are usually lighter and easier to store, and they carry several bikes in a small space. The trade-offs: the contact points can scratch paint, bikes hang close together and need straps or padding so they do not rub, and bikes without a straight top tube, such as step-throughs and many kids’ bikes, may need a frame adapter bar.

Hatch access, locks and wobble

Think about how often you will open the back with bikes loaded. A tilt-down rack angles the load away from the vehicle so the hatch or tailgate can open. A swing-away rack pivots to the side for full access. One major rack maker warns that some racks can interfere with certain bumpers and tailgates, and suggests tilting the rack down and lowering the tailgate slowly the first time to check clearance.

Security has two parts: a lock that keeps the rack in the receiver and locks that keep the bikes on the rack. If you will leave bikes on the vehicle at a trailhead or overnight, look for a rack with both built in.

Wobble is the other common complaint. Many racks use a threaded hitch pin or an anti-wobble bracket to snug the rack inside the receiver, and add-on threaded stabilizers are made for both receiver sizes. Check that the rack is tight before every trip, and follow the rack’s instructions for rechecking it.

Plates, lights, length and clearance

Loaded bikes can hide your license plate and taillights. Rules on plate and light visibility vary by state, so check your state’s DMV rules before a long trip, especially if you will cross state lines.

A rack also makes the vehicle longer. Take extra care when backing up and parking, and measure your garage before you pull in with the rack on. On lower vehicles, a rack that sticks out behind the bumper can scrape on steep driveways and dips, so take them slowly. If your vehicle carries a spare tire on the back, make sure the rack clears it.

One more rule from a major rack maker: never mount a hitch rack on a trailer or other towed vehicle.

Roof racks and roof boxes as alternatives

A hitch rack is not the only way to carry bikes. Bike mounts can ride on a base roof rack with crossbars, which leaves the hitch free and keeps bikes away from the tailgate. The downsides: you lift each bike overhead, you add height for garages and drive-throughs, and you add wind drag. U.S. government fuel economy guidance says a large rooftop cargo box can cut highway fuel economy by about 6 to 17 percent, against about 1 to 5 percent for a rear-mounted cargo box or tray. If you need room for gear as well, a cargo roof box on top with the bikes on the hitch is another setup. Browse all car racks and auto gear to compare options, or our cycling section for bike accessories.

Once you have settled on a style, compare hitch bike racks by receiver size, bike count and per-bike weight limit. Measure before you order: items can be returned within 30 days of receiving the order if they are unused, undamaged and in the original packaging, and return shipping is paid by the customer unless the item is defective or not as described. Details are in our Return and Refund Policy.