4SR Patent: A triple seam is not enough!
Tuesday, 21. September 2021
At 4SR, we have always placed a lot of emphasis on safety, we wanted to create something new, something greater, and smarter. Our first patent was also focused on the protection of the rider, specifically the knee and the attachment of knee pads in the pant legs of our motorcycle pants. Although the path of continuous innovation is often challenging and complex, the two words "comfort and safety" always come first in the development of 4SR clothing.
We regularly evaluate the current offer of the best protectors from the given segment, and we select the most suitable and safest solutions for our products. We test the leather skin to make sure we really offer the very best to our customers. We listen carefully to our race drivers and apply their knowledge to production. The results are first-class, racing suits with more than 18 protectors, leather that has exceeded the strictest requirements of EN 13595-2: 2002 Level 2 by 60% in the abrasion resistance test, and a comfortable fit that enables full mobility even in extreme positions.
We have been improving our motorcycle suits for more than 12 years and strive to bring customers constant improved products. Both in the field of active safety, such as the implementation of airbag systems, as well as passive improvements, for example, innovative protectors. Years later, it's time to revise the basic production processes, which are the seams.
What is the foundation of the motorcycle suit? Several dozen pieces of leather and other materials sewn together according to a precisely defined procedure, and because the chain is only as strong as its weakest link, the importance of the seams is equal to the quality of the leather, Kevlar stretch, and other materials and elements.
We know from our experience that a standard safety seam (called a double seam), which is defined according to ISO 4916, may not withstand sliding on asphalt. So you may be surprised that the vast majority of motorcycle suit manufacturers use this stitching method on the hips of their suits. The double seam is sewn, as the name suggests, with only two threads. The first visible thread, gets warn out immediately after the fall. If this seam is struck by an obstacle, such as the edge of a stone protruding from the asphalt, the pressure cannot withstand the other thread, which is hidden under the folding of the leather. The whole structure of the seam then falls apart and a you are left with a hole.
However at For Street Racing, the number hidden in the seam design no longer indicates the number of stitches, the construction of our double seam is sewn 4 times! You wouldn't notice anything on the outside, as it appears just like the standard double seam, only one stitch is visible, but the other three are hidden inside, and that is the fundamental difference.
Double seam from the reverse
4SR patented double seam from the reverse
During a fall, or slide and catching a sharp edge, only one seam can be torn, the other three seams provide safety support and the stitching still remains firm and flat. Thanks to this patented improvement, you will not slip on your own skin when and if the safety seam gets torn. A 200% backup of this critical point moves the construction of 4SR motorcycle suits to a higher level.
You can already find this patented, 4x sewn safety seam on your 4SR suits, as the new sewing production processes have been introduced on all of our 2020 model suits.
The fact that at 4SR we do our job sincerely and candid is also shown by the fact that we can be proud of our cooperation with top competitors such as Jack Kennedy, Keith Farmer, American flat track champion James Rispoli, James Ellison, Hannes Soomer or Karel Hanika. For the fifth year in a row, we are dressing the record holder in the number of victories of the North West 200 race, Alastair Seeley.