Smart Car Roof Rack Guide: Cargo Boxes, Bike Mounts, and Everything You Need to Haul on Top

The first time you realize your Smart car needs to carry something longer than the interior allows—like skis, a surfboard, or even just extra luggage for a weekend getaway—you start looking up at that empty roof space and wondering if a roof rack is actually possible on such a tiny car.

TL;DR

Yes, you can install a roof rack on most Smart models, including the Fortwo, Forfour, #1, and #3. The key is using vehicle-specific mounting systems that attach to the roof’s designated mounting points or door frames. Smart Fortwo models use a specialized mounting system that clamps to the roof edges, while the newer #1 and #3 have factory rails or integrated mounting points. You can carry up to 110-165 pounds depending on the model and rack system. Common uses include bike carriers, ski racks, cargo boxes, and surfboard mounts. Installation ranges from simple 15-minute clamp-on systems to more involved permanent mounts. Always respect the dynamic weight limits—what you can carry while driving is less than the static capacity—and never exceed the manufacturer’s roof load rating.

Key Takeaways

• Most Smart cars can accept roof racks using model-specific mounting systems
• Smart Fortwo uses clamp-on roof racks that attach to the door frames or rain gutters
• Smart #1 and #3 have factory roof rails on some trims or integrated mounting points
• Dynamic roof load capacity is typically 110-165 lbs depending on the model
• Popular accessories include cargo boxes, bike carriers, ski/snowboard racks, and surfboard mounts
• Installation takes 15-45 minutes for most systems and requires no drilling
• Always distribute weight evenly and secure loads properly before driving
• Consider aerodynamic cargo boxes for better efficiency and reduced wind noise
• Thule, Yakima, and Smart OEM accessories offer the best compatibility
• A roof rack can transform your Smart from a city runabout into a weekend adventure vehicle

Introduction: Why Put a Roof Rack on a Smart Car?

There’s something amusingly practical about strapping a cargo box to the roof of a tiny Smart car—the contrast is almost cartoonish—but once you’ve used it to carry camping gear, bicycles, or winter sports equipment, you’ll wonder how you ever managed without it.

The Smart car’s biggest limitation is interior storage. Even with the passenger seat folded flat and the rear seats down, there are items that simply won’t fit inside. Long skis, surfboards, large bicycles, and bulky luggage all exceed the Smart’s compact dimensions.

A roof rack solves this problem by adding a new dimension of storage—upwards—without compromising the car’s drivability or efficiency.

Here’s the thing about driving a Smart with a roof rack—you stop worrying about carrying gear long before you reach your destination. Once you’ve loaded up your bikes or cargo box, you realize the car is far more capable than most people give it credit for.

Smart Roof Rack Compatibility by Model

Smart Fortwo (All Generations)

Mounting system: Clamp-on or rain gutter mount

The original Smart Fortwo doesn’t have roof rails or factory mounting points. Instead, roof racks attach using specialized clamps that hook onto the roof edges or door frames.

Key considerations:

• Requires vehicle-specific mounting clips
• No permanent modifications needed
• Can be installed or removed in 15-30 minutes
• Available from Thule, Yakima, and Smart OEM
• Maximum dynamic load: 110-132 lbs (50-60 kg)

The Fortwo’s roof is relatively small—only about 33 inches wide—so choose accessories that fit within this dimension.

Smart Forfour (All Generations)

Mounting system: Clamp-on with longer crossbars

The Forfour has a slightly longer roof than the Fortwo, allowing for wider crossbars and more accessory options.

Key considerations:

• Similar clamp-on system to the Fortwo
• Wider crossbars needed due to longer roof span
• Slightly higher load capacity: 132-150 lbs (60-68 kg)
• Better stability due to longer wheelbase

Smart #1

Mounting system: Roof rails or integrated mounting points

The newer Smart #1 features roof rails on many trims, making rack installation significantly easier.

Key considerations:

• Factory roof rails on Premier and higher trims
• Standard crossbars attach directly to rails
• Load capacity: 165 lbs (75 kg) with rails
• Some Base trims may need clamp-on adapters
• Cleaner, more integrated look than clamp-on systems

The #1’s roof rails are designed to work with standard T-slot crossbars from Thule and Yakima.

Smart #3

Mounting system: Roof rails or integrated mounting points

Similar to the #1, the #3 offers roof rails on higher trims.

Key considerations:

• Roof rails standard on most trims
• Same load capacity as the #1: 165 lbs (75 kg)
• Sleeker design with lower profile
• Compatible with all standard roof accessories

Smart EQ Fortwo (Electric)

Mounting system: Clamp-on (same as gas Fortwo)

The electric version of the Fortwo shares the same roof design and mounting options.

Key considerations:

• Same clamp-on system as gas models
• Load capacity slightly reduced due to battery weight: 110 lbs (50 kg)
• Consider aerodynamic cargo boxes to reduce range loss
• Battery weight affects overall payload, so be mindful of total load

Types of Roof Rack Systems

Clamp-On Roof Racks

How they work: Rubber-coated metal clamps hook onto the roof edges or door frames. Crossbars span between the clamps.

Pros:

• No permanent modifications required
• Can be removed when not in use
• Fits most Smart models
• More affordable than rail systems

Cons:

• Slightly less stable than rail-mounted systems
• Can scratch paint if not installed carefully
• May create wind noise
• Not as sleek-looking as integrated systems

Clamp-on racks are the most common choice for Smart Fortwo owners. Brands like Thule and Yakima offer vehicle-specific fitting kits.

Rail-Mounted Roof Racks

How they work: Crossbars attach directly to factory-installed roof rails using locking feet.

Pros:

• More secure and stable
• Clean, integrated appearance
• Lower wind noise
• Easier to install and remove

Cons:

• Requires factory roof rails (not always standard)
• More expensive than clamp-on systems
• Limited to models with rails

Rail-mounted systems are the best choice for Smart #1 and #3 owners with roof rails.

Track or Fixed-Point Roof Racks

How they work: Permanent tracks are bolted to the roof using pre-existing mounting points.

Pros:

• Most secure option
• Sleek, permanent installation
• Can support heavier loads
• No risk of paint damage

Cons:

• Requires drilling or factory mounting points (rare on Smarts)
• Expensive
• Not easily removable

Fixed-point racks are not typically available for Smart cars due to the lack of factory mounting points on most models.

Choosing the Right Crossbars

Material Options

Aluminum Crossbars:

• Lightweight and strong
• Rust-resistant
• More expensive than steel
• Best for most Smart applications

Steel Crossbars:

• Heavy but durable
• Less expensive than aluminum
• Can rust if coating is damaged
• Use less common due to weight concerns

Aerodynamic Crossbars:

• Wing-shaped design reduces wind noise
• Slightly more expensive
• More fuel/energy efficient
• Recommended for Smart cars

Aerodynamic crossbars reduce wind noise and drag by up to 20%, which is especially important with the Smart’s small engine or limited EV range.

Crossbar Width

For Smart Fortwo: 33-37 inches (narrower roof)
For Smart Forfour: 40-44 inches
For Smart #1/#3: 42-46 inches

Always measure your roof width before purchasing crossbars. Too narrow won’t fit; too wide will protrude and look awkward.

Load Capacity

Dynamic load (while driving): The weight you can carry while driving. This is the critical number.

• Smart Fortwo: 110-132 lbs
• Smart Forfour: 132-150 lbs
• Smart #1/#3: 165 lbs

Static load (parked): The weight the rack can support when stationary. Usually much higher—up to 500 lbs or more.

Always exceed the dynamic load limit when securing items. The car’s handling and stability depend on it.

Best Roof Accessories for Smart Cars

Cargo Boxes

Best for: Luggage, camping gear, bulky items

Cargo boxes are the most popular roof accessory for Smart cars. They add significant storage capacity while keeping items dry and secure.

Key considerations:

• Length: Choose 40-55 inches (longer boxes may overhang)
• Height: Keep under 18 inches to maintain garage clearance
• Capacity: 150-350 liters is ideal
• Opening: Dual-side opening is more convenient
• Aerodynamics: Smooth, low-profile boxes reduce drag

Thule Motion XT and Yakima SkyBox are popular choices that fit the Smart’s compact roof.

Top choices:

• Thule Force XT: Great all-around box with medium capacity
• Yakima SkyBox: Sleek design with multiple sizes
• Smart OEM: Perfect fit but limited capacity
• Jetz: Budget option for occasional use

Bike Carriers

Best for: One or two bicycles

Bike carriers are ideal for Smart owners who commute to trails or enjoy weekend rides.

Types:

• Roof-mount: Bikes sit on top of the rack
• Fork mount: Front wheel removed, fork attaches to rail
• Frame mount: Bikes attach by the frame
• Wheel mount: Bikes sit upright with both wheels on rack

Key considerations:

• Weight per bike: 25-40 lbs typical
• Carrying capacity: 1-2 bikes on most Smart roofs
• Locking: Look for integrated locks for security
• Easy loading: Consider how high you need to lift the bike

For the Smart Fortwo, one bike is the realistic maximum. The #1 and #3 can handle two with careful weight distribution.

Top choices:

• Thule UpRide: Frame contact-free, secure
• Yakima HighRoad: Easy loading, excellent stability
• Smart OEM Bike Carrier: Perfect fit and factory warranty

Ski and Snowboard Racks

Best for: Winter sports equipment

Ski racks are popular among Smart owners in colder climates.

Key considerations:

• Number of skis: 4-6 pairs typical
• Binding protection: Ensure rack doesn’t damage bindings
• Locking: Important for expensive equipment
• Loading height: Consider lift height for roof-mounted skis

Most ski racks are designed to fit a variety of crossbar widths and work well with Smart’s narrow roof.

Top choices:

• Thule SnowPack: Premium quality, secure grip
• Yakima FatCat: Good protection, easy loading
• Smart OEM Ski Holder: Perfect fit, factory quality

Surfboard and SUP Racks

Best for: Water sports enthusiasts

Smart cars are popular among surfers because they’re easy to park at crowded beaches.

Key considerations:

• Board length: 5-10 foot boards
• Number of boards: 1-2 typical
• Padding: Soft padding protects boards
• Tie-down points: Straps must secure boards properly

Surf racks mount directly to crossbars with foam padding and strap tie-downs.

Top choices:

• Thule Surf Rack: Premium quality with soft padding
• Yakima Surfboard Rack: Reliable and affordable
• Inno Surfboard Carrier: Good value option

Kayak and Canoe Racks

Best for: Paddlers

Kayaking with a Smart is surprisingly possible with the right rack system.

Key considerations:

• Boat weight: Under 50 lbs is ideal
• Boat length: Up to 12 feet (may overhang significantly)
• Carrying capacity: One kayak or canoe
• Stability: Use J-style carriers or stacker systems

A kayak hanging off the back of a Smart car looks dramatic but works fine when properly secured.

Top choices:

• Thule Hull-A-Port: J-style carrier, easy loading
• Yakima JayLow: Versatile, holds various hulls
• Malone J-Pro: Budget-friendly option

Cargo Baskets

Best for: Oversized items, moving

Cargo baskets provide an open platform for carrying odd-sized items.

Key considerations:

• Size: Small or medium baskets only
• Weight capacity: 110-165 lbs
• Security: Use nets or straps to secure items
• Aerodynamics: Open baskets create drag

Cargo baskets are useful for moving but create significant wind noise and drag.

Installation Guide: Step-by-Step for Smart Fortwo

Installing a roof rack on a Smart Fortwo is straightforward with the right kit.

Tools needed:

• The roof rack kit with vehicle-specific mounting clips
• Crossbars (usually included in kit)
• Hex key or Allen wrench (often included)
• Torque wrench (recommended for proper tension)
• Measuring tape
• Step stool or ladder for reaching the roof

Step 1: Clean the Roof

Wash the roof thoroughly where the clamps will attach. Dirt can scratch the paint and interfere with the clamp’s grip.

Use mild soap and water, then dry completely.

Step 2: Assemble Crossbars

Lay out the crossbars and attach the vehicle-specific mounting clips according to the manufacturer’s instructions.

Most racks come partially assembled. Follow the detailed instructions included with your specific kit.

Step 3: Position the Rack on the Roof

Carefully place the assembled rack onto the roof. Position it so:

• The crossbars are parallel to each other
• They’re centered on the roof
• Clamps are properly positioned at the door frame or rain gutters
• The front crossbar is slightly taller than the rear (if aerodynamic design)

For Smart Fortwo, typical crossbar spacing is 22-26 inches apart.

Step 4: Attach Clamps

Connect the clamps to the roof edges or door frames. Each clamp should:

• Fit snugly against the door frame
• Not pinch or damage weather seals
• Be oriented correctly (each clamp is specific to its position)

Many racks use a rubber coating to protect the paint. Ensure it’s properly positioned.

Step 5: Tighten Crossbars

Tighten each clamp gradually, working in a cross pattern to ensure even tension.

• Follow the manufacturer’s torque specifications (usually 4-6 Nm)
• Don’t overtighten—this can damage the clamp or roof
• Check that the rack doesn’t move when pushed

Step 6: Test Security

Push and pull on the rack to test stability:

• It should not move side to side
• It should not shift front to back
• There should be no play in the clamps

Retighten after 50 miles of driving, as clamps can settle.

Step 7: Install Accessories

Once the rack is secure, attach your cargo box, bike carriers, or other accessories according to their instructions.

Always double-check that accessories are locked and secure before driving.

Smart #1 and #3 Installation (Rail-Mounted)

Installation on models with factory rails is even simpler:

Step 1: Identify Rail Mounting Points

• Some rails have fixed mounting positions
• Others have a continuous T-slot track
• Check your vehicle manual for specific details

Step 2: Install Feet or Direct Attachments

• Attach mounting feet to the crossbars
• Place the crossbars on the rails at the correct spacing
• Tighten the clamps or T-slot bolts securely

Step 3: Test Security

• Push and pull to ensure everything is secure
• Check that crossbars are parallel and centered

Safety and Driving Tips With a Roof Rack

Before Each Trip

• Check all connections: Ensure everything is tight
• Test load security: Push on cargo to verify it’s stable
• Verify clearance: Ensure you’ll clear garage doors and overhangs
• Check tire pressure: Add a few PSI for roof loads

During Driving

• Reduce speed: Keep under 75 mph (120 km/h)
• Allow extra stopping distance: Roof loads increase stopping distance
• Avoid sudden moves: Lane changes and cornering affect stability
• Be aware of crosswinds: Roof loads make the car more susceptible
• Listen for unusual noises: Whistling or thumping indicates problems

Parking

• Garage clearance: Know your total height with the rack
• Low overhangs: Watch for parking garage height restrictions
• Wind: Park with the rack facing away from strong winds

Range and Efficiency Impact

For Smart EVs, a roof rack reduces range:

• Empty crossbars: 5-8% range reduction
• Aero cargo box: 10-15% range reduction
• Bike carriers (empty): 8-12% range reduction
• Full cargo box with luggage: 15-20% range reduction
• Bikes mounted: 15-25% range reduction

Plan your routes accordingly and add charging stops if needed.

Smart Roof Rack Comparison Table

Feature	Smart Fortwo Clamp-On	Smart #1 Rail-Mounted	Smart #3 Rail-Mounted
Mounting Type	Clamp/door frame	Factory roof rails	Factory roof rails
Max Dynamic Load	110-132 lbs	165 lbs	165 lbs
Crossbar Width	33-37 inches	42-46 inches	42-46 inches
Installation Time	15-30 minutes	10-20 minutes	10-20 minutes
Wind Noise	Moderate	Low	Low
Price Range	$200-$400	$250-$450	$250-$450
Best Accessories	Small cargo boxes, one bike	Full-size boxes, two bikes	Full-size boxes, two bikes
Removable	Yes	Yes	Yes
Vehicle Modifications	None	None	None

Top Roof Rack Brands for Smart Cars

Thule

Best for: Premium quality, extensive selection

Thule offers vehicle-specific mounting kits for all Smart models.

Key products:

• Thule WingBar Evo: Aerodynamic crossbars
• Thule SquareBar: Classic square profile
• Thule Motion XT Cargo Box: Popular all-around box
• Thule UpRide: Premium bike carrier

Thule’s quality and durability make them the industry leader, but they command higher prices.

Yakima

Best for: Value and innovation

Yakima offers excellent alternatives to Thule, often at slightly lower prices.

Key products:

• Yakima JetStream: Aerodynamic crossbars
• Yakima SkyBox: Popular cargo box
• Yakima HighRoad: Easy-load bike carrier

Smart OEM (Factory Accessories)

Best for: Perfect fit and warranty

Smart-branded accessories are made by Thule or other premium manufacturers.

Key products:

• Smart Cargo Box: Designed specifically for Smart dimensions
• Smart Bike Carrier: Factory-approved and warrantied
• Smart Roof Bars: Vehicle-specific fit

OEM accessories are more expensive but offer guaranteed compatibility and maintain factory warranty.

Inno

Best for: Budget-conscious buyers

Inno offers good-quality racks at lower prices.

Key products:

• Inno Square Bars: Affordable crossbars
• Inno Wedge Cargo Box: Sleek design, lower price
• Inno Bike Carriers: Good value

Smart Roof Rack Cost Breakdown

Initial Investment

• Crossbars: $150-$350
• Mounting kit: $100-$200
• Cargo box: $300-$800
• Bike carrier: $150-$400
• Ski/snowboard rack: $100-$300

Total for a complete setup: $700-$1,500 depending on accessories.

Ongoing Costs

• Lock cylinders: $50-$100 (essential for security)
• Replacement parts: $20-$100 for lost or damaged items
• Aerodynamic efficiency loss: Increased fuel/energy costs

FAQ: Smart Car Roof Racks

Can you put a roof rack on a Smart Fortwo?
Yes, clamp-on roof racks are designed specifically for the Smart Fortwo and attach to the door frames or rain gutters without permanent modifications.

What is the roof load limit for a Smart car?
Smart Fortwo models have a dynamic roof load limit of 110-132 lbs; Smart #1 and #3 can carry up to 165 lbs with factory roof rails.

Will a roof rack affect my Smart’s fuel economy or range?
Yes, empty crossbars reduce efficiency by 5-8%, while cargo boxes and bikes can reduce range by 15-25% for EVs and increase fuel consumption similarly.

Can I install a roof rack myself?
Yes, most systems are designed for DIY installation and take 15-45 minutes with basic tools like a hex key and measuring tape.

Will a roof rack scratch my Smart’s paint?
If installed properly with rubber-coated clamps and clean surfaces, paint damage is unlikely. Ensure the mounting surfaces are clean and clamps are not overtightened.

Can I carry a kayak on a Smart car?
Yes, with proper kayak carriers and a crossbar system, a Smart can carry one kayak up to 12 feet long, though it will overhang the roof significantly.

How many bikes can a Smart car carry?
The Smart Fortwo typically carries one bike; the #1 and #3 can carry two bikes with proper roof racks and weight distribution.

Are Smart roof racks noisy?
Aerodynamic crossbars produce minimal wind noise, but square bars can be loud. Accessories like cargo boxes and bike carriers create additional noise, especially at highway speeds.

Can I use any roof rack on my Smart?
No, you need vehicle-specific mounting kits to ensure proper fit and safety. Thule, Yakima, and Smart OEM offer compatible systems.

Is it worth getting a roof rack for a Smart car?
If you regularly carry large items like bikes, skis, luggage, or outdoor gear, a roof rack transforms your Smart’s practicality and is well worth the investment.

References

Smart Car Roof Rack Resources and Information:

• Thule Smart Car Roof Racks
• Yakima Smart Car Roof Racks
• Smart Official Accessories
• Car and Driver Roof Rack Testing

Have you installed a roof rack on your Smart car? What’s your favorite accessory or most memorable adventure with it? Share your experiences in the comments below.