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

    At

    $1

    At

    Category
    FitnessFitness
    Weight
    23.7 lbs
    4.7
    6.2
    AluminumCarbon
    Fork
    Specialized Future Shock 1.5Carbon
    Wheels
    AluminumAluminum
    Wheel Size
    700c700c
    Brakes
    Hydraulic DiscHydraulic Disc
    Groupset
    DeoreDeore
    Drivetrain
    1 × 111 × 10
    Suspension
    HardtailRigid
    Front Travel
    20mm-
    Brand Site

    specialized.com

    trekbikes.com

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

    Based on frame geometry and build specs.

    Rider Position
    relaxedaggressive
    2021 Sirrus X 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)

    31 mph

    2021 Sirrus X 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 A1 SL Premium Aluminum, Fitness Geometry, fully manipulated butted tubing, internal cable routing, flat-mount disc, 12x142mm thru-axle, Plug + Play rack/fender mounts

    BB StandardBSA, 68mm, Threaded

    ColorsGloss Sky Blue / Tarmac Black / Satin Black Reflective; Gloss Smoke / Cool Grey / Satin Black Reflective

    BB StandardBSA, 68mm, Threaded

    ColorsGloss Sky Blue / Tarmac Black / Satin Black Reflective; Gloss Smoke / Cool Grey / Satin Black Reflective

    Fork

    Carbon Monocoque, 12x100mm flat thru-axle, flat mount disc, Future Shock 1.5

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

    Bottom Bracket

    Threaded BSA 68mm, 24mm spindle

    Stem

    Future Stem, Comp

    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

    Specialized, alloy, 9-degree backsweep, 15mm rise, 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

    Bridge Comp, Hollow Cr-mo rails, 155/143mm

    Bontrager H1

    Seatpost

    Alloy, 2-bolt, 14mm offset, 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 Deore M5100, SGS, 11-speed

    Shimano Deore M5120, long cage

    Crank

    Forged aluminum arms, 2-piece, 24mm spindle, Narrow-wide Aluminum chainring, 40T

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

    Shifters

    Shimano Deore M5100, 11-speed

    Shimano Deore M4100, 10 speed

    Cassette

    Shimano Deore M5100, 11-speed, 11-42t

    Shimano Deore M4100, 11-46, 10 speed

    Chain

    KMC X11, 11-speed w/ Missing Link™

    KMC X10, 10 speed

    Brakes

    Front: Shimano BR-MT200, hydraulic disc, 160mm, Rear: Shimano BR-MT200, hydraulic disc, 160mm

    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, Center Lock disc, high-low flange, sealed cartridge bearings, 12x100mm spacing, 24H

    Formula CL-51 alloy, 100x5mm QR

    Rear Hub

    Alloy, Center Lock disc, high-low flange, sealed cartridge bearings, 12x142mm spacing, 28H

    Formula CL-52 alloy, 135x5mm QR

    Tires

    Front: Pathfinder Sport, 700x38mm, Rear: Pathfinder Sport, 700x38mm

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

    Disc Rotors

    Shimano RT10, CenterLock, 160 mm

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