How to Measure and Fit Car Rack Pads for Your Roof Rack
By Dakine | Backpacks, Luggage, Surf, Snow, & Bike Gear Since ... | Published: 2026-10-19
Category: How-to Guides
Learn how to measure your roof rack crossbars and choose the right size car rack pads for a secure, padded fit. Step-by-step guide with common mistakes to avoid.
Quick answer
Measure your crossbar circumference with a flexible tape, then check the pad's internal opening size. For standard square or round bars, the Dakine Rack Pads 18" work well; for aerodynamic or thicker bars, the Dakine Aero Rack Pads offer a sleeker fit.
Why pad size matters for safety and board protection
A loose rack pad can shift during driving, leaving your surfboard unprotected or even letting it slide off the roof. Pads that are too tight may not close properly, while oversized ones can flap in the wind. Getting the right circumference fit ensures the pad stays put and your board stays safe.
Standard vs. aero rack pads: what's the difference?
Standard rack pads like the Dakine Rack Pads 18" use custom extruded foam with a hook-and-loop closure, designed to fit square and round crossbars. Aero rack pads, such as the Dakine Aero Rack Pads 18" or the larger XL version, have a more aerodynamic shape and are better suited for modern, thicker, or factory aerodynamic crossbars. Both secure with hook-and-loop, but the aero versions offer a lower profile and a tighter wrap on streamlined bars.
Step-by-step guide to measuring and fitting your rack pads
- 1. Measure your crossbar circumference: Use a flexible measuring tape or a piece of string to wrap around the thickest part of your crossbar. Note the measurement in inches or centimeters. This tells you the internal opening size the pad needs to fit. Common mistake: measuring the width of the bar instead of the circumference. The pad wraps around, so circumference is what matters.
- 2. Measure your crossbar length (pad width): Measure the length of the crossbar from one end to the other. Most rack pads are 18 inches long, which covers the typical contact area for surfboards. If your bar is shorter, ensure the pad doesn't overhang excessively. Checkpoint: If your crossbar is significantly longer than 18", consider two pads per bar for full coverage.
- 3. Choose the right pad type for your bar shape: For square or round bars, standard rack pads like the Dakine Rack Pads 18" work well. For aerodynamic or thicker factory bars, choose aero rack pads like the Dakine Aero Rack Pads 18" or the XL version for extra thickness. Common mistake: using standard pads on aero bars can cause a loose fit and wind noise. Aero pads have a sleeker profile that matches the bar shape.
- 4. Attach the pad and test the fit: Open the hook-and-loop closure, wrap the pad around your crossbar, and press the closure firmly. The pad should be snug enough that it doesn't slide when you push it, but not so tight that the fabric strains. Check that the pad covers the full width of your board's contact area. Checkpoint: After installation, give the pad a firm tug. If it moves more than an inch, try a different size or type of pad.
Product facts to consider
- Aero Rack Pads XL: The Dakine XL Aero Rack Pads have a 18-inch long pad with upper padding and a sleek hook-and-loop closure, offered in two sizes to fit a range of crossbar circumferences. If your crossbars are thicker or have an aerodynamic shape, the XL size gives you a better fit and more padding coverage.
Aero Rack Pads XL - Aero Rack Pads 18": The Dakine Aero Rack Pads 18" also use a sleek hook-and-loop closure and are offered in two sizes for different crossbar circumferences. For standard aero bars, the regular size provides a snug, low-profile fit without excess material.
Aero Rack Pads 18" - Rack Pads 18": The Dakine Rack Pads 18" feature custom extruded foam covered with durable 600D polyester fabric and a hook-and-loop closure, designed for square and round crossbars. If you have traditional square or round bars, this is a cost-effective option that still provides solid protection.
