Hundreds Of Products Ready Today. Dispatch/Collection TRS Harness Belt Around a Roll Cage Installation Guide
Fitting a harness belt securely around a roll cage is one of the most important steps when building a road-legal track car or competition-ready vehicle. Whether you’re installing a 4-point harness in a weekend toy or a full FIA 6-point setup in your race car, understanding how to correctly mount your shoulder belts is essential for driver safety.
At GSM Performance, we work closely with TRS Motorsport to help customers get their harnesses installed safely, especially when wrap-around mounting is involved. One of the most common installation methods involves wrapping the shoulder straps around a harness bar integrated into the roll cage. When done correctly, this method is not only safe but often stronger and more direct than using bolt-in mounts, especially in custom or stripped-out vehicles.
In this updated 2026 guide, we’ll walk you through why this installation method is so widely used, break down how to do it step-by-step, and link you to TRS’s official video demonstration. Whether you’re a first-time builder or a regular track day driver, this guide will help you get it right the first time.
Watch the Process: TRS Motorsport’s Video Tutorial
If you’re installing your harness belts for the first time, or even if you’re just double-checking your technique, there’s no better starting point than TRS Motorsport’s official installation video. In just a few short minutes, the video gives a clear, step-by-step visual guide on how to correctly wrap your shoulder harnesses around a roll cage bar using the supplied adjuster hardware.
This video is perfect for anyone who wants to:
- Understand how the metal three-bar adjuster works
- See the correct belt threading technique in action
- Learn how to achieve a secure and symmetrical wrap
- Avoid common mistakes like twisting the webbing or incorrect tensioning
The TRS team carefully demonstrates how to keep the belt flat and tight as it’s looped around the roll cage bar, and how to properly thread it back through the adjuster for maximum grip and security. They also point out the correct position of the harness bar in relation to the driver’s shoulders, which is essential for both comfort and crash safety.
Even if you’re confident with the process, we always recommend watching the video as a refresher. A visual walk-through adds clarity to the written steps and gives you peace of mind that your installation matches what TRS themselves recommend.
We often play this video in-store when advising customers about harness installations. It’s one of the most effective ways to ensure your harness setup is done right the first time.
How to Securely Wrap Your Harness Around the Roll Cage: A Step-by-Step Guide
When it comes to motorsport, safety is paramount. One crucial aspect of ensuring driversafety is the proper installation of the harness system. At GSM Performance, we understand the importance of every detail in motorsport safety gear, which is why we’re proud to offer TRS harnesses among our selection. TRS Motorsport is known for its commitment to safety and quality, and in this blog post, we’ll guide you through the process of wrapping your harness around the roll cage, as demonstrated by Jake from TRS Motorsport.
Step 1: Prepare the Three-Bar Slide
The first step involves adjusting the three-bar slide, which is a key component in the harness system. You’ll want to lift the slide and thread the harness webbing under it, then over the top, leaving some slack. This initial step is crucial for setting up the rest of the process smoothly.
Step 2: Wrap the Webbing Under the Roll Cage
Next, take the webbing and loop it underneath the roll cage. It’s important to ensure that the three-bar slide is positioned snugly against the roll cage. After looping the webbing under the roll cage, thread it back underneath the three-bar slide, pull it tight, and then loop it through the slide once more. This step is vital for securing the harness in place and preventing any movement during use.
Step 3: Secure the Webbing
The third step is perhaps the most critical for safety. After looping the webbing through the three-bar slide, you’ll need to double back on yourself, pulling the webbing tight. It’s essential to leave at least 10 centimeters (about 4 inches) of “tail” at the end of the webbing. This extra length is a safety measure to account for any potential slippage or elongation of the webbing in the event of an accident. Ensuring this extra length can make a significant difference in the harness’s effectiveness and the safety of the driver.
Step 4: Coil the Excess Webbing
Finally, with the harness securely wrapped and tightened, the last step is to manage any excess webbing. Start by coiling the webbing neatly, beginning from underneath to create a tight loop. Once you have a neatly coiled loop, secure it with a tie wrap. This step may require a bit of finesse, so don’t hesitate to ask for assistance to ensure the tie wrap is tight and the excess webbing is neatly managed.
View Our Full TRS Motorsport Harness Range
We stock one of the largest collections of TRS harnesses in the UK, covering everything from entry-level 4-point road harnesses to full FIA-approved 6-point belts for serious competition use. Whether you’re building a track day car, a show car, or a full-blown race car, our TRS range has something that will suit your needs and budget.
Our TRS collection includes different mounting styles like bolt-in, clip-in, and wrap-around options, as well as various widths, adjuster types (steel or alloy), and a wide range of colours to match your interior or branding. We also offer TRS harnesses with HANS compatibility, quick-adjust lap straps, and pull-up or pull-down configurations depending on your preference.
To help you get the right setup, each listing includes full specifications and images, plus recommendations for compatible roll cages, seats, and accessories. Whether you’re after something FIA-homologated or just need a belt for fast road use, you’ll find it in our TRS Motorsport harness range.
Why Proper Harness Installation Matters
Harness belts are a critical part of your safety setup. If they’re mounted incorrectly, even the best belts on the market won’t perform as intended. The shoulder straps, in particular, need to be mounted at the correct angle and with the correct method around the roll cage bar to avoid injuries in the event of a crash or sudden stop. That’s why TRS Motorsport’s official wrap-around method is the industry standard.
Which TRS Harness Belts Are Compatible?
Nearly all TRS Motorsport harnesses with a shoulder strap “wrap around” option are compatible with this installation method. This includes their full range of FIA-approved motorsport harnesses, as well as some road-legal harness kits.
Look for features like:
- Shoulder straps with metal adjusters
- 3- or 4-inch wide shoulder webbing
- Clearly labelled wrap-around mounting ends
Our Most Popular TRS Harness Belts
At GSM Performance, we keep a curated range of the most in-demand TRS belts in stock. These include both FIA-approved and road-homologated versions, with different width, colour, and buckle options.
We’ve created paired listings that show our current in-store stock levels for each harness model, so you can easily see what’s available and ready to collect or ship. These listings are updated in real time and can be found on our Speed Plus page.
Final Thoughts: Make Safety a Priority
Installing your TRS harness properly is just as important as choosing the right bucket seat or cage. Taking the time to follow the correct wrap-around procedure around a roll cage will ensure your harness performs as intended and keeps you safe under load.
Following these steps will ensure that your TRS harness is securely wrapped around the roll cage, offering maximum safety and peace of mind. Remember, the key to effective harness installation is precision and attention to detail. By taking the time to properly install your harness, you’re investing in safety and performance.
Whether you’re prepping a full race car or simply upgrading your track-day machine, we’re here to support your build with trusted harness solutions from TRS Motorsport. And with our in-store stock available for viewing and testing, you can buy with confidence.
At GSM Performance, we’re committed to offering the best in motorsport safety equipment. If you have any questions about TRS harnesses or any other safety gear, please don’t hesitate to get in touch with us.