Qubic System QS-BT1 seat belt tensioner.

Sustained G-forces on your body - two independent 200 N direct drive channels tension the harness to simulate braking, cornering, traction loss and engine vibrations.

Same direct drive technology as the QS-220 actuators, 8-step plug and play setup
Works standalone or alongside motion platforms; designed and made in Poland, EU

Note! Requires a bucket seat with shoulder-height belt slots and a racing harness (not included). Standalone use needs the Motion-Lock remote switch; runs exclusively with QubicManager/ForceSeatPM - not SimHub-compatible.

You might need

Sparco Competition H-3 steel seat belts €259,00 EUR

Product variants

€1.702,32

incl. VAT

Next business day delivery: place your order before 15:00 UPS Express Saver or 16:30 DHL Express.

FREE shipping:DHL Economy/UPS Standard for orders over 390€ and DHL Express/UPS Express Saver over 1190€

Red shield with number 3, symbolizing protection and security.

3 year warranty. B2B too!

Shipping costs and estimated delivery time?

Our webshop is connected directly to DHL and UPS systems - you'll see real-time shipping prices and accurate delivery date estimates at checkout, based on your address. Every shipment is fully insured.

FREE DHL Economy/UPS Standard shipping for orders over 390€ and FREE DHL Express/UPS Express Saver over 1190€.

DHL Express 12:00

delivery by 12:00 noon on the next business day in many EU destinations
orders placed before 16:30 are dispatched the same day
limitations: max. 27 kg, not available for cockpits or seats

DHL Express

next-business-day delivery in many EU destinations
orders placed before 16:30 are dispatched the same day
limitations: max. 27 kg, not available for cockpits or seats

UPS Express Saver

the faster UPS option, with next-business-day delivery in many EU destinations
orders placed before 15:00 are dispatched the same day
limitations: max. 37 kg, not available for cockpits or seats, max. 3000€ order value

DHL Economy

reliable delivery at a lower cost
orders placed before 16:30 are dispatched the same day
no weight limit - suitable for cockpits and seats

UPS Standard

our lowest-cost shipping option
orders placed before 15:00 are dispatched the same day
no weight limit - suitable for cockpits and seats
free Saturday delivery in many larger cities in the UK, DE, FR, NL, BE, IT, ES and PL - note: the delivery estimate at checkout doesn't yet show Saturday as a delivery day, so your order may arrive a day earlier than estimated
max. 3000€ order value

Warranty, exchanges and returns

Warranty and legal guarantee

The manufacturer's warranty period for this product is shown below the Add to cart button. Some brands offer longer coverage - Simucube and Sim-Lab products come with a 3-year manufacturer's warranty, and the Simucube ActivePedal Ultimate with 5 years.

If you buy as a consumer, you also have a minimum two-year legal guarantee from GPerformance as the seller. The manufacturer's warranty is additional and does not replace or limit your statutory rights.

If something goes wrong, contact us - we'll handle the claim for you, including any coordination with the manufacturer. You don't have to deal with anything yourself, and shipping cost is on us.

Need help choosing?

If you're not sure whether a product is compatible with your setup, get in touch before ordering. We'll help you pick the right option. Honest advice is always free.

Product exchange within 14 days

Sometimes gear feels different on your rig than you expected - force feedback, pedal response, wheel ergonomics. That's fine. Within 14 days of delivery, you can request an exchange for a different product or variant. The product just needs to be in good condition, complete and returned in its original box - short testing on your rig is fine.

Exchanges are meant for genuine purchases, not for trying out products. If you're unsure what suits your setup or driving style, ask us before ordering - we're happy to help, and we want you racing on gear you're happy with. For business (B2B) purchases, please contact us first.

14-day right of withdrawal

If you buy as a consumer and change your mind, let us know within 14 days of receiving the product - no reason needed. You can use the Withdraw from contract link in the footer or email [email protected].

Once you've notified us, you have another 14 days to send the product back. The direct cost of return shipping is covered by you. If the product is faulty or you received the wrong item, contact us first and we'll arrange a suitable return method.

Inspecting and returning the product

You can unpack and inspect the product just as you would in a store. Handle it with care and return it complete, with all accessories, cables and manuals. Keep the original box and protective materials, as they help protect the product during return shipping.

If you've handled or used the product beyond what's needed to establish its nature, characteristics and functioning, you keep your right of withdrawal, but we may reduce the refund by the loss in value this caused.

Any questions?

Questions about compatibility, warranty, exchanges or returns? Email [email protected] - a real person will reply, often the owner himself.

Motion platform vs QS-BT1 sustained force comparison - 400 N combined belt tension

Feel the G-forces your screen can't show

Classical motion platforms depend on Earth's gravity for prolonged accelerations - even a 20-degree pitch produces only about 165 N of perceptible sustained force on your chest. The QS-BT1 generates 200 N per channel, 400 N combined, and holds you in the braking zone for as long as the car decelerates.

Use it standalone, or pair it with a motion platform: the belts take over the sustained G-forces, and the platform spends its full range on everything else. Layered realism, each system doing what it does best.

Load video: Qubic System QS-BT1 braking simulation demo - harness loading under deceleration

Braking you can feel in your chest

Slam the brakes and the harness loads up instantly - the complex dynamics of deceleration pressed into your body, not just shown on screen. Wheel locks, slip and pre-impact protection each have their own distinct feel.

Racing effects include braking, lateral accelerations, centrifugal force in cornering, wheel slip and lock, traction loss and oversteer, gear changes, engine vibrations with rev limiter, vertical G-force and road harshness - depending on what the game's telemetry provides.

Two independent channels, every direction

Two independently controlled channels shape the force on each shoulder separately - the outside belt loads up through a corner, slack releases into oversteer, and every transition lands where your body expects it.

The drive is the same direct drive technology as the QS-220 and QS-DD-20: no gearbox, no backlash, motor torque directly proportional to the force on your shoulders. Fine details survive all the way to the belt.

Correct seat belt slot height for QS-BT1 - slots level with the shoulders

Little details that matter

The seat decides half the experience: belt slots should sit level with your shoulders - too low pulls you down instead of back, too high softens the feedback. The slots must be wide enough for the belt to move freely; low-friction inserts are included to keep the fine details alive.

Use a proper racing harness - 4, 5 and 6-point all work, with a 3-inch 5-point being the most tested combination. An FIA-grade harness is recommended for its stiffness and a locking mechanism that holds under load - for example the Sparco Competition H-3.

Load video: Qubic System QS-BT1 engine vibration and road texture demo - belt pulse effects

Every bump, curb and pulse - through the belts

The belts don't just pull - they pulse. Curbs, road texture, engine vibrations and gear changes arrive as short, crisp impulses on your shoulders, layered on top of the sustained forces.

It's a feedback channel the rest of your rig can't reach: force feedback lives in your hands, pedals under your feet - the QS-BT1 puts the track on your upper body.

Manual, Downloads and Technical details

Manual
Qubic System QS-BT1 seat belt tensioner Manual download

Download
Qubic system QS-BT1 seat belt tensioner Software download

Technical details:

Dimensions: (L × W × H) 561 mm / 22.13 in x 99 mm / 3.90 in x 138 mm / 5.43 in
Weight: 12 kg / 26.46 lbs
Packing box dimensions: (L × W × H) 660 x 255 x 180 mm / 25.98 x 10.04 x 7.09 in
Packing box weight: 19 kg /42 lb
Power Supply Weight: 2.8 kg / 6.17 lbs
Power Source: 4A/115VAC, 2A/230VAC
Rated Power: 321 W
Inrush Current: 20A/115VAC, 40A/230VAC
Protection Class: 1
Interface: USB
Number of Independent Channels: 2
Pulling Force: 20.5 kg / 45 lbs / 200 N per channel
Storage Temperatures: +5 °C to +40 °C
Full Performance Temperatures: +5 °C to +35 °C
Supported Effects: Depends on Specific Game
Multifunctional RGB
Maximum Length of USB Cable: 3 m
Maximum Length of Motion-Lock Cable: 3 m

Compatibility

PC (Windows) only!
QS-BT1 runs exclusively with QubicManager/ForceSeatPM - it cannot be controlled from SimHub, SimTools or Sim Racing Studio. Consoles: Gran Turismo 7 on PS5 works via a Windows PC intercepting telemetry (supported as-is).

Motion platform compatibility

Works fully standalone - no motion platform required
Qubic System platforms: QS-H13, QS-210, QS-220, QS-CH2, QS-S25, QS-S35, QS-V20
PS motion platforms (custom mounting brackets required)
Next Level Racing Motion V3, Motion Plus, Traction Plus
3rd party motion platforms - QubicManager runs in parallel with your platform software

Seat movers: QS-BT1 mounts to the top frame only, close to the pivot point, and reduces the allowed user weight.

Cockpit, seat and harness compatibility

Aluminium profile cockpits: universal mounting adapters included
QS-CH1, QS-S25, QS-V20 and NLR Motion V3: dedicated installation kits sold separately
Bucket seat with belt slots at shoulder height, wide enough for free belt movement (not included)
Racing harness 4/5/6-point - 3-inch 5-point is the most tested, FIA-grade recommended (not included)

Note! Standalone use requires the Motion-Lock remote switch (sold separately). Connected to an existing Motion-Lock circuit (QS-210, QS-220, QS-V20, QS-S25, QS-DD-20), no additional switch is needed.

What is in the package?

1× Main unit (QS-BT1)
1× USB cable
1× External power supply with power cord
2x Low friction inserts and velcro strips for seat belts slots
2× Universal mounting adapters for aluminium cockpits with necessary hardware
2× Belt buckles and fasteners
1× Motion-Lock jumper
1× Motion-Lock interlink cable

Not included:
Seat belts
Cockpit
Bucket seat
Motion-Lock remote switch (sold separately)
Dedicated adapter for other cockpits (sold separately)

What our customers say about this product

What does the QS-BT1 actually do?

It tightens your harness in sync with telemetry: brake hard and the straps pull you into the seat exactly as deceleration G would in a real car. Two independent channels deliver up to 200 N (about 20.5 kg) of pulling force each - sustained G is the one sensation a static rig cannot fake, and belt tension is the most convincing illusion of it available.

Do I need a special harness and seat?

Yes - the tensioner works by pulling real harness straps, so you need a multi-point harness like the Sparco Competition H-3 routed through a seat with harness slots in the backrest. Racing shells from our seat collection are built for exactly this.

Does it work without a motion platform?

Absolutely - it connects over USB and runs standalone, and on a static rig it is often the biggest immersion jump per euro, because braking G is what your body misses most. With a motion platform it then completes the picture: motion handles rotation and texture, the belts handle sustained deceleration.

Which sims support the belt tensioner?

All major PC titles expose the telemetry the Qubic software reads - the specific effects available (braking, acceleration, impacts) depend on what each game publishes, which is why the spec honestly states supported effects are game-dependent. In the big racing sims, the core braking effect works exactly as intended.

Is the installation complicated?

Manageable in an afternoon: the unit (12 kg, 561 mm long) mounts behind the seat, the harness straps route through it, and the PC connection is a single USB cable (up to 3 m). Power is standard mains (115/230 V, 321 W rated). The linked manual covers the exact routing - and we gladly answer setup questions before or after purchase.