Bike Comparison
    MSRP
    $1,500$1,799
    Where to Buy
    $1,500

    At Specialized

    $1

    At

    Category
    FitnessFitness
    Weight
    23.7 lbs
    5.4
    6.2
    CarbonCarbon
    Fork
    CarbonCarbon
    Wheels
    AluminumAluminum
    Wheel Size
    700c700c
    Brakes
    Hydraulic DiscHydraulic Disc
    Groupset
    Sora, microSHIFT R9Deore
    Drivetrain
    2 × 91 × 10
    Brand Site

    specialized.com

    trekbikes.com

    Summary
    The Specialized Sirrus 4.0 is a 700c carbon frame fitness bike with mid-range components and hydraulic disc brakes.
    Similar Bikes
    Accessories
    Ride Feel

    Based on frame geometry and build specs.

    Rider Position
    relaxedaggressive
    2021 Sirrus 4.0
    2023 FX Sport 4
    Other Fitness bikes
    Gear Range

    A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

    Lowest gear

    (climbing)

    39 mph

    2021 Sirrus 4.0

    33 mph

    2023 FX Sport 4

    Highest gear

    (descending)

    Spec Level

    Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

    Geometry
    Specs
    Frame

    Specialized FACT 9r carbon, Fitness Geometry, 12x142mm thru-axle, internal cable routing, flat-mount disc, Plug + Play fender mounts

    BB StandardBSA, 68mm, Threaded

    ColorsSatin Flake Silver / Charcoal / Black Reflective; Gloss Uv Lilac / Satin Black Reflective

    BB StandardBSA, 68mm, Threaded

    ColorsSatin Flake Silver / Charcoal / Black Reflective; Gloss Uv Lilac / Satin Black Reflective

    Fork

    Specialized FACT carbon, 12x100mm thru-axle, flat-mount disc, Plug + Play fender mounts

    Carbon, hidden fender mounts, flat mount disc, 100x5mm thru-skew

    Bottom Bracket

    Shimano 68mm threaded

    Stem

    Specialized, 3D-forged alloy, 4-bolt, 7-degree rise

    Size: XS, Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 90mm length; Size: S, M, Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 100mm length; Size: L, XL, Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 110mm length

    Handlebar

    Double-butted alloy, 9-degree backsweep, 31.8mm

    Size: XS, S, Bontrager Satellite Plus IsoZone, alloy, 31.8mm, 15mm rise, 600mm width; Size: M, L, XL, Bontrager Satellite Plus IsoZone, alloy, 31.8mm, 15mm rise, 660mm width

    Saddle

    Body Geometry Power Sport, steel rails

    Bontrager H1

    Seatpost

    Alloy, 12mm offset, 2-bolt clamp, 27.2mm

    Bontrager alloy, 27.2mm, 12mm offset, 330mm length

    Pedals

    Specialized Body Geometry Fitness, platform, plastic

    Bontrager City pedals

    Grips

    Bontrager Satellite IsoZone Plus, lock-on, ergonomic

    Groupset
    Rear Derailleur

    Shimano Sora, 9-speed

    Shimano Deore M5120, long cage

    Front Derailleur

    microSHIFT R9, 9-speed, 31.8mm clamp

    Crank

    50/34T

    Size: XS, S, Prowheel alloy, 42T narrow-wide ring, 170mm length; Size: M, L, XL, Prowheel alloy, 42T narrow-wide ring, 175mm length

    Shifters

    microSHIFT, 9-speed

    Shimano Deore M4100, 10 speed

    Cassette

    Shimano Sora, 9-speed, 11-34t

    Shimano Deore M4100, 11-46, 10 speed

    Chain

    KMC X9, 9-speed w/ Missing Link™

    KMC X10, 10 speed

    Brakes

    Front: Tektro HD-R280, hydraulic disc, resin pads, flat-mount, 160mm, Rear: Tektro HD-R280, hydraulic disc, resin pads, flat-mount, 140mm

    Promax DSK-927 hydraulic disc, flat mount, 160mm rotor

    Wheels
    Rims

    700C disc, double-wall alloy, 22mm depth, 21mm internal width, 32h

    Bontrager Paradigm, Tubeless Ready, 32-hole, 21mm width, Presta valve

    Spokes

    Stainless, 14g

    Front Hub

    Alloy, 6-bolt disc, sealed cartridge bearing, high-low flange, 12x100mm thru-axle, 28h

    Formula CL-51 alloy, 100x5mm QR

    Rear Hub

    Alloy, 6-bolt disc, sealed cartridge bearings, high-low flange, 12x142mm thru-axle, 28h

    Formula CL-52 alloy, 135x5mm QR

    Tires

    Front: RoadSport Reflect, Wire bead, Blackbelt/Endurant Casing, 700x32c, Rear: RoadSport Reflect, Wire bead, Blackbelt/Endurant Casing, 700x32c

    Bontrager GR1 Expert, Hard-Case Lite, wire bead, 60 tpi, 700x40mm

    Disc Rotors

    Shimano RT10, CenterLock, 160 mm

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