Racetech RT4129WHR Advanced Fibreglass/Kevlar/Carbon Wide Race Seat
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Details
Details
The Racetech RT4129WHR is the wide (WHR) variant of Racetech's high-end 129 "Advanced" series, built with a hybrid shell of fibreglass, kevlar, and carbon composites.
It retains full compliance with the FIA 8862-2009 "Advanced Racing Seat" specification and is offered alongside the standard and wide/tall variants. ([Racetech-seats 129 series specs]:contentReference[oaicite:0]{index=0}; wide spec listing
Specifications
| FIA Homologation | FIA 8862-2009 Advanced Racing Seat, fully homologated in 129 series |
|---|---|
| Shell Composition | Composite shell — fibreglass + kevlar + carbon hybrid |
| Seat Cover / Upholstery | Black fire-retardant fabric with suede wear patches |
| Shell Weight (approx.) | ~ 13.5 kg (≈ 29.8 lb) for the WHR variant |
| Total Weight (with padding) | ~ 15.0 kg (≈ 33.1 lb) |
| Dimensions (WHR model) | A: 67 cm (external shoulder width) B: 58 cm (height to shoulder wings) C (internal hip width): 41 cm D: 50 cm (width at shell front) E: 47 cm (base length) F: 92 cm (overall height) G: 62 cm (height to harness guide) Mount (side-mount) width: 44 cm |
| Side Mount Hole Centres | 295 mm (standard RT / 129 spacing) |
| Back Mount Centres (shoulder) | 250 mm (designed for back mounting) |
| Bolt Torque Recommendation | 30 Nm / 22 ft-lb (zinc or high-strength hardware) |
| Harness Compatibility | Up to 6-point harness systems |
| Head Restraint | Integrated head wings (approx. 270° wrap), HANS compatible |
| Air Ducting / Cooling | Integrated cooling ducting to lower back region |
Key Features
- Wider shell geometry to better accommodate broader drivers without compromising containment
- High-performance composite shell for enhanced strength, stiffness, and impact resistance
- Full shoulder / head containment via integrated head wings
- Back-mount capability built into shell to distribute loads and improve structural integrity
- Air ducting to channel fresh air to the driver's lower back, aiding in comfort on long stints
- Threaded bosses in head/shoulder areas for harness nets or safety nets
- Side and back mounting brackets (RTB1009M / RTB1006B) typically included with seat
Mounting & Installation
Recommended mounting & installation practices:
- Use certified side-mount brackets (matching 295 mm spacing, e.g. RTB1009M) for chassis/floor mounting
- Back-mount the seat to the roll cage at shoulder level (250 mm spacing) is required for FIA compliance in the 129 series
- Torque mounting bolts to ~ 30 Nm (22 ft-lb) using high-strength hardware
- Ensure harness belts route cleanly through slots without contacting shell edges or hardware
- Check for clearance between head wings and cage, trim, wiring before final torque
- After initial installation (or break-in sessions), recheck and reconfirm all bolt torques
Safety & Compliance
The 129 series (including the WHR variant) is homologated to **FIA 8862-2009 Advanced Racing Seat** standards, offering high-level structural, material, and impact performance credentials.
To maintain homologation integrity, seats with head restraint wings **must** be back-mounted at the shoulder level as mandated by FIA rules.
Always verify with your sanctioning body or series rules that the RT4129WHR variant, mounting method, and harness configuration are acceptable before racing use.