Whoa! What’s going on with that seat tube? iamspecialized unveils radical “Compliance Junction” on new Sirrus Carbon for urban and gravel riding cycling
Specialized has introduced a radical-looking Sirrus Carbon bike design that features a new “Compliance Junction” designed to provide “just the right amount of flex and forgiveness across the carbon frame without sacrificing performance and efficiency”. The Sirrus models come with Specialized’s existing Future Shock front suspension and areThe innovative frame has a seat tube that doesn’t reach down to the bottom bracket.
In a vertical stiffness test with a static load of 1,200N applied, Specialized says that its frame allowed 7.9mm of vertical deflection compared with 2.9mm for an unnamed conventional frame. Horizontal deflection at the saddle was 7.2mm compared with 4.1mm for the conventional frame.In a horizontal stiffness test, where a 600N load was applied at a specific location, Specialized says that its frame deflected 5.1mm while the conventional frame deflected 6.7mm.
“The horizontal stiffness test showed a decrease of 24% in the horizontal deflection for the main frame compared to the conventional frame which does not substantially impact the ride characteristics but it provides evidence that the frame design works well to handle the loads/stresses applied during the horizontal stiffness test, which is believed to correlate to real-world riding.”
Trek has also interrupted the seat tube recently to improve comfort – and also aerodynamics – with the IsoFlow technology that features on the Madone SLR. However, that’s very different in that the interruption is at the top rather than low down.suspension technology within the head tube. Future Shock is a system that allows the handlebar and stem to move to reduce the amount of high-frequency vibration that’s transferred from the road surface to the rider.
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