How to Install a Roof Rack: Crossbars on Raised Rails, Flush Rails and Bare Roofs
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Installing roof rack crossbars is usually a 30- to 60-minute job with basic tools. The steps depend on your roof type, so identify that first. Always follow your rack’s instructions and fit guide, since measurements and torque values are vehicle-specific.
Table of Contents
Step 1: Identify Your Roof Type
| Roof type | What it looks like | What you need |
|---|---|---|
| Raised side rails | Rails with a gap underneath | Clamp-on crossbars or towers for raised rails |
| Flush side rails | Rails with no gap | Towers made for flush rails |
| Fixed points | Covered mounting points | Fixed-point towers and fit kit |
| Bare roof | No rails or points | Clip-in towers with vehicle-specific clips |
Not sure? See what is a roof rack.
Step 2: Gather Tools and Parts
- Crossbars, towers and any fit kit
- The included key or torque tool, or a torque wrench
- A tape measure
- A step stool
- A soft cloth to protect the paint
Step 3: Set the Crossbar Spread
The fit guide lists the distance between front and rear bars, often measured from the windshield or between bars. Measure carefully. Correct spread affects load capacity and fit with accessories.
Step 4: Mount the Towers
- Raised rails: wrap the clamp around the rail and snug it loosely.
- Flush rails: position the foot and engage the clamp under the rail edge.
- Fixed points: remove the covers and bolt the towers in.
- Bare roof: set the foot pads on the roof and hook the vehicle-specific clips into the door frame.
Step 5: Center and Square the Bars
Make sure both bars are centered side to side and parallel. Equal overhang on each side keeps it balanced and quieter.
Step 6: Tighten to Spec
Tighten each tower evenly to the torque in the instructions. Many rack systems include a torque-limiting tool. Don’t overtighten, especially on bare roofs.
Step 7: Test and Check
- Push and pull firmly on each bar. Nothing should shift.
- Open and close all doors on bare-roof systems to check the clips.
- Re-check tightness after the first drive and periodically.
Load Limits and Fuel Economy
Thule explains that several of its crossbar models are rated for up to 220 pounds per pair, but the vehicle’s roof limit can be lower and the lowest value always applies. The total includes the rack, accessories and cargo. FuelEconomy.gov notes that roof cargo increases drag and lowers fuel economy, so remove the rack when you don’t need it.
- Please verify the roof rack's compatible dimensions before making your purchase.56-inch long cross rail roof rack mounts to most cars, SUVs, or crossovers with raised longitudinal rails, gap between rail and car roof must be 1/2 inch (1.3cm) and above, distance between two rails must be bigger than 42 inch (107cm) and smaller than 49.6 inch (126cm) , diameter of rail must be within 1.4-2.1 inch (36-55mm). Vehicle fit found in Product Description below.
- Reduced Wind Noise: Rubber sealing strips minimize wind noise for a quieter, more comfortable drive. Refer to the installation video for guidance.
- Durable and Robust: High-quality aluminum alloy construction resists corrosion and supports up to 165 lbs for heavy loads.
- Anti-Theft Security: Features a secure anti-theft locking system with rubber-coated steel clamps and a non-rust lock for added protection.
- Compatibility and Installation Note: For proper fit and safety, watch 2 instructional videos on our detailed page for guidance.
Universal crossbars like these fit many raised side rails within a certain width range.
Reducing Wind Noise
- Add a fairing at the front bar
- Use aero-shaped bars
- Keep bar ends trimmed or capped
- Remove the rack when not in use
Frequently Asked Questions
How long does it take to install a roof rack?
Often 30 to 60 minutes for crossbars. Bare-roof systems may take longer the first time.
Can I install a roof rack myself?
Yes, most crossbar systems are designed for DIY installation with included tools.
Do I need special tools?
Usually only the included key or torque tool. A torque wrench helps with some systems.
How far apart should roof rack crossbars be?
Follow your fit guide. Spread is vehicle-specific.
The Bottom Line
To install a roof rack, identify your roof type, set the crossbar spread from the fit guide, mount and center the towers, torque them to spec and test them. Respect the lowest load limit and remove the rack when not needed.
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