Hybrid Bikes

Specialized Sirus X 4.0

By: Mason Arnold

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Specialized Sirus X 4.0 Road Bike [Review]

Sirus X  4.0
Road Bike

Specialized Sirrus X 4.0 Review

The specialized Sirrus X 4.0 is a hybrid bike designed to offer comfort to bikers on any terrain hence, the body geometry saddle, pedals and handgrips, 38mm-wide tires, and the future shock suspension system. The structure of this bike gives riders an upright position preventing arching and making riding very comfortable. Apart from the comfort, specialized Sirrus X 4.0 comes with lightweight carbon forks that are more responsive especially for people who take longer rides.

Wide Shimano gear range

The specialized Sirrus X 4.0 has a wide gear range (minimum-11 teeth and maximum-42 teeth cassette and 1×12 speed Shimano Deore). This gearing provides precise shifting for long-distance rides. The wide range of gear enables riders to weather the steepest of inclines even while carrying stuff. Even with the least cog (11), there is still plenty of gear to propel the bike up a mountain without putting in much effort.

38mm-wide tires with a Presta 48mm valve

This bike can boast of its 38mm-wide tires which have the capacity to provide a more stable ride. The tires grips and traction allows for smooth riding even on gravel and muddy terrain. The Presta valve imbued tires give more support, especially when pedaling up an incline with less speed. The 700c rims and double-wall alloy helps hold the tires in place for a more reliable ride. 

Future shock suspension system

This is a coil shock located just above the head tube and under the stem, it also features a 20mm of travel. Its position (above head tube) enables the bike to move in a vertical path and because it is placed under the stem, the bike’s wheels are firmly held together by the frame. This feature does a good job of keeping you balanced when you are riding on rough roads and taking sharp turns while maintaining your speed.


Frame; premium aluminum with internal cable routing, rack/fender mounts (plug and play), fitness geometry, flat-mount disc

Fork; future shock compatible steerer, carbon monocoque, 12 x 100mm flat thru-axle.

Chainrings; Aluminium 40T

Chain: KMC X10, reusable 10 speed

Cassette; 11-42 teeth, 10-speed, sun race

Handlebars; Alloy, stout mini rise, 15mm rise, 9-degree backsweep, 31.8mm

Front and rear brakes; hydraulic disc, 160mm, Shimano BR-MT200

Stem; specialized, 7-degree rise, 4-bolt, 3D-forged Alloy

Saddle; 155/143 mm, hollow Cr-mo rails, bridge comp,

Front and rear tires; pathfinder sport, 700x38mm

Seat post; Alloy, 27.2mm, 14mm offset 2-bolt

Spokes; stainless, 14g

Front hub; 24h, sealed cartridge bearings, Alloy, high-low flange, a spacing of 12 x 100 mm, center Lock™ disc

Rear hub; 28h, high-low flange, Alloy, a spacing 12 x 142 mm, 28h, sealed cartridge bearings, center Lock™ disc

Rims; Alloy that consists of double-wall, 700C disc, 32h, Depth of 22mm, Internal width of 21 mm

No. of gears; 10

  • The specialized Sirrus X 4.0 is very comfortable to ride without causing back aches.
  • It offers a smooth ride even on rough grounds and gravel ridden roads.
  • Hydraulic disk brakes allowing for great stopping power
  • It could feature a shifter with wider speed set


Who is the specialized Sirrus X 4.0 for?

This bike is for riders who are all about the adventure, riding on different terrains from plain pavements to gravels and on rough grounds. The bike is designed to provide comfort for seasoned bikers.


The specialized Sirrus X 4.0 is a hybrid bike that offers a smooth and comfortable ride. With its fast and grippy tires, riders can be sure of a stable ride, even on rough roads. It’s Sunrace 10 speed cassette and its 10-speed Shimano Deore shifter is sure to give an exhilarating performance coupled with its Shimano hydraulic brake disc. The specialized Sirrus X 4.0 is built for the adventure.