Specialized 2023 Sirrus Carbon keeps commuting comfortable
Support us! Bikerumor may earn a small commission for affiliate links in this article. To learn more
Last month, we secured a special patent called “Corner Post Bicycle Frame”. Today’s announcement of the 2023 Specialized Sirrus Carbon proves we were sorely mistaken in thinking it could materialize as the next generation classic road race bike in spring. Indeed, the slant-post frame has found its way into a model historically positioned as a comfort commuter bike, although with 700c x 42mm tire clearance, the new Sirrus makes a strong case for its reuse as a flat gravel bike.
With the 2023 Sirrus Carbon, Specialized aimed to combine performance and comfort in a lightweight and versatile package. They even made him look cool. Prices start at $2,250.
The 2023 Specialized Sirrus X 5.0 Carbon retails for $2,250.
2023 Specialized Sirrus 6.0 Carbon and Sirrus X 5.0 Carbon
The 2023 Specialized Sirrus Carbon is a road and gravel-friendly bike with a striking aesthetic thanks to what Specialized calls the crossroads of conformity. As the name suggests, it’s not just about looking cool; in fact, this is done to flex the back a bit for better forgiveness and comfort. We are told that it does this without sacrificing performance or efficiency.
So how much does it actually bend?
Well, the exact number of millimeters is not specified. However, if we look at the patent relating to this frame design, we can see that they have tested a “corner post bike frame” to a vertical deflection of 7.9mm; this compares to the 2.9mm of vertical deflection they saw with the “regular frame” that was tested next to it. To learn more about the stiffness properties of the frame design in question, check out our patent description here.
There is no escape from this; The 2023 Specialized Sirrus Carbon does indeed look surprisingly familiar. We just can’t ignore the fact that very recently a very similar frame design was shown in the form of the Rondo Ruut V2 carbon gravel bike. It also gets a “broken seat tube” replaced by a corner post that slides forward to meet the down tube rather than the bottom bracket block. However, Specialized put the Rondo in first place as the Ruut V2 won’t be available until the end of this year.
While the Ruut V2 is a specialty gravel bike with a drop bar and (probably) clearance for bigger tires, the Specialized Sirrus is more of an all-rounder aimed at city dwellers who need a bike efficient enough for their daily commute. but is not afraid to venture out onto the gravel paths in the surrounding area.
Compliant compound isn’t the only source of vibration dampening on this frame. Like their dedicated Diverge gravel frame, the 2023 Sirrus Carbon also boasts Future Shock, a unique suspension design located under the stem that prevents harsh frequencies caused by bumps in the road from getting into the rider’s hands. Above the head tube is a hidden spring that moves along a vertical path. Unlike stock front suspension, the Future Shock does not cause any changes in frame or wheelbase geometry.
The 2023 Specialized Sirrus Carbon 6.0 retails for $3,000.
This one comes with Roubaix Pro 32mm tires.
The 2023 Sirrus Carbon is well-equipped for long rides with the ability to fit three water bottles on the front triangle polygon; one on the partial seat tube, a second on the down tube, and a third on the top side of the top tube. Sirrus is compatible with MIK mounting points for racks and fenders, in particular Specialized DRYTECH 42c fenders.
Sirrus is available in two price points: $3,000 for Sirrus 6.0 and $2,250 for Sirrus X 5.0. They share the same carbon frame and fork but differ in important features such as drivetrain, brakes and tires (specs below). Both are available in sizes XS-XXL, with each frame’s carbon overlay specifically tuned to ensure ride quality remains consistent regardless of size.
Reach spans from 350mm to 425mm with the same chainstay length of 440mm on all frames. The Sirrus Carbon sizing guide can be found on the Specialized website.
2023 Sirrus Carbon frame details Frame Construction: Specialized FACT 9R Carbon, 12mm x 142mm thru-axle, Flat Fork: Specialized FACT 9R carbon monocoque, 12mm x 100mm thru-axle, Flat Mount, Low Rider Mounts, Plug + Play Rack / Fender Mounts Bottom Bracket: 68mm Threaded Tires Ground Clearance: 700c x 42mm (without fenders); 700c x 38mm with fenders Seatpost: 27.2mm
Prices and Availability
The 2023 Specialized Sirrus 6.0 retails for $3,000 and is only available in Gloss Black/Pearl/Metallic White Silver/Black Reflective colorways. A more affordable option is the Sirrus X 5.0, retailing at $2,250, available in Gloss White Mountains/Gunmetal/Satin White Mtns Reflective or Satin Red Tint/Carbon/Black.