How to Properly Use Harness and Belt Pads in Your Sim Racing Seat

Quick answer

Slide each harness pad onto the belt before you bolt the belt to the chassis, position it where the strap crosses your collarbone, and tighten the belt only after the pads sit flat against your shoulders. If a pad bunches, twists, or slides down toward your chest during a stint, it is installed on the wrong strap width or too far down the belt.

Harness pads are the cheapest comfort upgrade on a sim racing rig, but they are also the most commonly misinstalled. Put them on the wrong strap, in the wrong spot, and they bunch under load, slide down your chest, or leave the shoulder belt digging in exactly where you were trying to protect.

This guide walks through a repeatable belt pads installation process for a typical sim racing seat, from checking strap width to a final on-track position check. It assumes a four-, five-, or six-point harness with two shoulder straps, which is what most sim racing seat belts use.

Before you start: check strap width and pad opening

Measure the shoulder strap width first. Most sim racing harness webbing is 2 inches (50 mm) or 3 inches (75 mm), and pads are sold to match one or the other. A 3-inch pad on a 2-inch belt will slide; a 2-inch pad on a 3-inch belt will not close around the webbing at all. If your pad has a Velcro or hook-and-loop closure, check that the flap overlaps fully when wrapped around the strap.

Also confirm you have two pads, not one. Pads are usually sold in pairs, but single-pad listings exist. You want one per shoulder strap so the load is symmetrical. If you are also running a sub-belt or lap belts, those rarely need pads and adding them can change how the buckle sits.

• Checkpoint: pad opening matches belt width, and the closure overlaps by at least 20 mm.
• Common mistake: ordering pads before measuring the belt, then forcing a 2-inch pad over 3-inch webbing.

Step 1: Fit the pads before mounting the belts

Slide each pad onto its shoulder strap before the belt is bolted to the chassis or seat. Once the belt is mounted, the end hardware and adjusters often block the pad from sliding on. Work the pad along the webbing by hand, keeping the webbing flat so it does not fold inside the pad channel.

If your seat has fixed shoulder slots, feed the belt through the slot first, then add the pad. This order matters more than it sounds: threading a pad through a tight slot can crush the padding and leave a permanent crease.

• Checkpoint: the pad slides freely along the strap with the webbing flat inside it.
• Common mistake: mounting belts first, then trying to stretch the pad over the adjuster hardware.

Step 2: Position the pad where the strap crosses your shoulder

Sit in the seat in your normal driving position, with the seat back angle and pedal distance set. Have someone mark or hold the pad where the shoulder strap crosses the top of your shoulder and collarbone. That is the contact point that takes load, so that is where the padding belongs. On most rigs this is roughly 100 to 150 mm below the shoulder slot in the seat.

Do not place pads down at chest level. They will not contact anything under load, and they can interfere with the buckle or the lap belt path. If the strap crosses your neck instead of your shoulder, the problem is belt routing or seat height, not pad position.

• Checkpoint: pad sits on the shoulder contact point, not on the chest or neck.
• Common mistake: positioning pads by eye while standing beside the rig instead of sitting in it.

Step 3: Tighten the harness, then re-check pad position

Tighten the shoulder straps to your normal driving tension, then pull each pad down slightly against the webbing so it seats flat. A correctly seated pad should not twist, fold, or gap away from the strap. If it rotates around the belt, the closure is too loose or the pad is oversized for the webbing.

Re-check after five minutes of driving. Webbing settles, and a pad that looked perfect in the pits can creep toward your chest once the belts are loaded. Small adjustments now prevent a distracting reposition mid-stint.

• Checkpoint: pad stays flat and in place after tightening and a short driving session.
• Common mistake: tightening belts first and never re-checking pad position under load.

Step 4: Confirm the pad does not change belt geometry

A pad should add comfort without changing the belt path. If adding pads pushes the shoulder strap away from your body, or lifts it off the seat, the pad is too thick for your setup. Thick pads can also stop the belt from sitting fully in the shoulder slot, which changes how the load spreads.

Check the angle from the shoulder slot to your shoulder. It should stay roughly straight, with the pad compressing slightly against you. If the belt now runs over the pad instead of through it, the pad is too far up the strap.

• Checkpoint: belt path and angle look the same with pads on as they did without them.
• Common mistake: using thick pads to fix a belt that is routed at the wrong height.

Step 5: Maintain and inspect the pads

Wipe pads with a damp cloth and mild soap, then let them air dry. Avoid soaking the closure or leaving pads wet against the webbing, which can stiffen the strap over time. Check the closure and stitching every few months, especially if you tighten and release the belts often.

Replace pads when the padding flattens, the closure stops holding, or the cover tears. Worn pads are a comfort issue, not a safety failure, but they can let the belt edge contact your shoulder again, which is the whole reason you installed them.

• Checkpoint: closure holds, padding is still resilient, and no tears expose the belt edge.
• Common mistake: machine washing pads or leaving them wet on the harness.

Harness pad installation steps at a glance

1. Measure belt width: Confirm shoulder webbing is 2-inch or 3-inch and match the pad opening to it. Checkpoint: pad slides on without forcing and the closure overlaps fully.
2. Fit pads before mounting belts: Slide each pad onto its shoulder strap while the belt is still off the chassis. Checkpoint: webbing stays flat inside the pad channel.
3. Mark shoulder contact point: Sit in your driving position and set the pad where the strap crosses your shoulder and collarbone. Checkpoint: pad is on the shoulder, not the chest or neck.
4. Tighten and re-check: Tighten the harness to driving tension, seat the pad flat, then drive briefly and check again. Checkpoint: pad has not twisted or crept toward your chest.
5. Verify belt geometry: Make sure the pad does not lift the belt out of the shoulder slot or change its angle. Checkpoint: belt path looks the same with pads on as without.
6. Clean and inspect: Wipe with mild soap, air dry, and check closure and stitching every few months. Checkpoint: replace pads when padding flattens or the cover tears.

Product facts that matter for harness pad setup

• Base Performance Simulators PW1 - Phoenix Wheel: The PW1 - Phoenix Wheel is an entry-level formula-style steering wheel from Base Performance Simulators, built with carbon fiber and billet aluminum, polymer rubber injection-molded grips, 8 high-end tactile buttons, and custom opaque white caps with a sticker sheet. Formula-style rims put your hands close together and your shoulders forward, so shoulder-strap pads need to sit higher and flatter than on a GT-style wheel. If you run this wheel, check pad position with your hands on the grips, not with your arms relaxed.
• MOZA Racing Lamborghini Revuelto Steering Wheel: The MOZA Racing Lamborghini Revuelto Steering Wheel is an officially licensed Lamborghini wheel recreated from original CAD data, with an aluminum frame, carbon fiber dual-clutch paddles, and fully programmable controls. A wheel with dual-clutch paddles encourages a more upright, locked-in driving posture, which loads the shoulder straps harder. Pads that stay flat under that load make longer stints more comfortable.

Harness pads only work when they sit on the shoulder contact point and stay flat under load. Measure your belt width, fit the pads before mounting the belts, and re-check position after your first stint. If a pad slides, twists, or lifts the belt out of its slot, fix the strap width or pad position rather than tightening the harness further.