Schroth Racing & HANS

About Schroth products

ECE-R 16.04 / DOT-FMVSS 209

SCHROTH street legal harness belts are unique in their ability to be installed to factory provided mounting points along with the factory provided seat belts. SCHROTH harness belts meet all certification requirements by the German TÜV, ECE-R 16.04 and US-DOT FMVSS 209 for use on public roads. Each belt comes with complete installation and operating instructions. If your vehicle is listed in the included Vehicle Reference List the installation has been tested and appoved with the stock seat or the listed aftermarket seats.

SCHROTH QuickFit harnessbelts have the make and model of the applicable car printed on the tail strap label.

Unlike most other aftermarket harness belts, most SCHROTH street legal harness belts have a unique disconnect feature between the front part of the harness and the rear tail strap. When you are not using the SCHROTH street legal harness belts, they can be stored out of the way allowing complete access for all passengers and full use of all factory seat belts.

RFR Buckle

The patented SCHROTH RFR™ rotary (cam lock) buckle operates with a carbon fiber reinforced gear system. Since it operates grease free it is insensitive to dust and other environmental influences. RFR™ the abbreviation for Regressive Force Release, means the release force is reduced during release operation rather than increasing as seen with all other rotary buckle products. Therefore the RFR™ buckle meets the stringent FIA required release forces without the need of an extended lever. The patented actuator with the recessed lever helps to avoid the risk of accidental release. The durable RFR™ rotary buckle is approximately 30 percent lighter than other products, yet it is still one of the strongest in the market. For FIA and ECE-R 16.04 (street legal) approved racing harnesses (FE models for Rally driving) it is available as a push button type buckle.

2″ Lap Belts

To explain why 2” webbing is more effective than 3” webbing, one needs to look at the shape of the human body. The Iliac Crest is the part of the pelvic bone that sticks out above the hips. 2” webbing fits entirely within that crest, where 3” webbing rides over the tips of the crest. The 3” webbing has less surface area by percentage than the 2” webbing which will cause more bruising on impact as “hot-spots” of force develop where the belt is making contact with the pelvic bone. Since the 2” webbing rides inside the crest it can be worn as much as 1” to 2” tighter and at the same time is more comfortable.

Since the 2” webbing fits well within the Iliac Crest of the pelvis, it is less likely to slide up above the crest and cause submarining – a condition where the body slides down below the lap belt possibly causing internal organ damage.

Research shows that the faster the pelvis is captured, the lower the resultant loads on the chest, head, and neck. There is no difference in the strength of the 2” webbing. All webbing (2” or 3”) must meet the same load tests.

ASM® Anti Sub Marining Technology

The patented SCHROTH asm® system offers an unique safety advantage for 4-point harnesses. asm® is the acronym for anti submarining. The risk to submarine (sliding underneath the lap belt), a well known phenomenon during frontal impacts, is significantly reduced by the asm® safety system. The energy converter is located in the inboard shoulder belt. Therefore make sure you purchase left and/or right harnesses. Severe injuries or death are possible using 4-point harnesses without the SCHROTH asm® safety system or an anti-sub strap. SCHROTH harnesses designed for use on public roads (FE push button models) or those likely to be used as 4-points come with the asm® safety system. The performance of the SCHROTH asm® safety system has also been positively tested in conjunction with airbags.

Current Head And Neck Supports (HANS®) provide further reduction of head deceleration and neck bending.

The asm® system on all SCHROTH Rallye and QuickFit belts – excluding the new QuickFit Pro – is not compatible the with HANS®. Only belts having a center RFR Cam lock can be used with HANS®.

We recommend that only non asm® belts be used in competition harnessbelts.

Racing harnesses without asm® must be worn with an anti-sub strap!

Webbing Longevity

Webbing that makes the difference!

The webbing we use is especially designed and manufactured for SCHROTH. Each lot manufactured must pass our stringent quality control procedures. SCHROTH only uses Polyester material. Polyester has advantages over Polyamide (NYLON®) webbing. Advantages, such as lesser degradation under light (see figure 1) and a resistance against acids like battery acid. In addition Polyester does not absorb moisture so the performance of SCHROTH harnesses do not change whatever the climate may be.

Polyester also has a better force/elongation ratio so a well designed webbing can convert more energy during an accident.

Webbing Construction

Unique to SCHROTH is the “memory effect” we have designed into our webbing. Special mono filaments laterally woven in, perform like small leaf springs and keep the webbing flat. This results in better load spreading over the full width of the SCHROTH webbing. An additional advantage of the SCHROTH webbing: The special weaving technology forms round edges for additional comfort.

Hybrid Style Restraints

Engineering in Action!

Typical Formula (D-Ring) restraints display high upper torso trajectory during a crash. To reduce this trajectory, the crotch straps have to be routed backwards and to be worn extremely tight. Some drivers complain of reduced blood flow in their legs. In addition, this configuration does not help during a rear impact to keep the buckle and the lap belt in the correct position. In particular in typical open-wheel race car seating positions the driver is not kept firmly in his seat but is likely to move up exceeding the roll over protection bar.

The so called T-bar 6-point belt design provides a better restraining function since the anti-sub straps can be routed downward following approximately a chest/crotch tangential. This keeps the buckle in place and provides direct load transfer from the shoulder straps into the anti-sub straps. During a rear impact the anti-sub straps keep the buckle and lap belt in place and restrain the driver much better in the seat.

The disadvantage of this type of harness: the T-bar should be wide enough to properly separate the anti-sub straps but is then likely to stick into the upper thighs. To increase the comfort, the buckle is often not worn as low as it should for best lap belt positioning.

The solution: the revolutionary SCHROTH Hybrid™ Restraint.

The crotch straps are not routed through D-rings or attached to a T-Bar but are held directly by the specially developed lap belt latches.Thanks to the patented SCHROTH RFR™ rotary buckle the load tranfer from the shoulder belts through the buckle into the anti-sub straps and vice versa in case of a rear impact is achieved. This direct load transfer is important for optimal restraining performance.

Flexi Belt 2″ Lap Belts

Flexi-Belt™ – one harness, many variations!

Length adjusters in lap belts come as „pull-ups“ or „pull-downs“. In addition they often have to be positioned differently to achieve optimal operation. SCHROTH has developed the solution which covers your different needs with just one lap belt model: the “Flexi-Belt™”.

The lap belt latches and brackets supplied with the harness can be assembled to the lap belt with a two-bar sliding bracket allowing you to change the configuration. With this you decide on pull-up or pull-down versions and if applicable, different for the left and right lap belt portion. You may also vary the lengths to optimize the adjuster position depending on your car, your seat and seating position. Even exchanging mounting hardware is possible (e.g. a bolt-in bracket for a snap-on bracket). „Flexi-Belt™“ is only available with 50 mm (2”) lap belts, SCHROTH “-II” models.

QuickFit Harness Technology

SCHROTH QuickFit and QuickFit Pro harnesses integrate into the existing vehicle safety system. They build on the fantastic success of the SCHROTH Rallye series belts relying on the asm Technology to keep the occupant from submarining under the lap belt as well as reduce head and chest deceleration forces. The difference is in the details as it often is.

These harnesses utilize the available factory female receptacles for attachment points. This is what makes these harnesses so special – they integrate into the airbag system. Many of todays vehicles come with two stage airbag systems that will deploy at different rates depending on whether or not the computer detects that the occupant is buckled in. In a standard 4 point system, there is nothing plugged into the female receptacle, so the computer does not know you are restrained.

In addition, by plugging into the female receptacle, many vehicles (BMW and Mini for example) have a pyrotechnic pre-tensioner built into the receptacle that will automatically tighten the lap belt 2” in an impact. This alone is worth the increase in price over a standard Rallye belt.

Couple the safety benefits with the fact that you can completely remove the harness from the vehicle in less than 10 seconds, you have the best of both worlds: something safe and convenient.

SCHROTH QuickFit restraints are the pinnacle of technology for Street Legal restraints.

Check out the official Schroth website page to find out more and buy your items here

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