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    Sirrus X 4.0

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    Sirrus X 4.0

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    We deliver! Just say when and how.

    Sirrus X is your ticket to riding more, and to places you never imagined possible. It’s a comfortable, capable, 'let’s do stuff' kind of bike that will inspire you to ride more than you ever have before. With bigger, confidence inspiring tires, a slightly more upright riding position, a super intuitive one-by drivetrain, and plenty of mounts for racks and fenders —it’s more than just a solid partner on pavement. Sirrus X is a dialed option when it’s time to hit some gravel. We’ve also equipped every Sirrus X with next-level comfort from our scientifically tested and ergonomically engineered Shared Platform Body Geometry saddle, handgrips, and pedals. We equipped Sirrus X 4.0 with the revolutionary Future Shock to take the sting out of bumps and potholes. Here’s to your life on two wheels.

    Technical Specifications

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    Frameset

    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

    Suspension

    Fork

    Specialized FACT 9r Carbon Monocoque, flat-mount disc, 12x100mm thru-axle, low rider mounts, Plug + Play fender mounts, Future Shock 1.5

    Cockpit

    Stem

    Future Stem, Comp

    Tape

    Specialized Neutralizer, Body Geometry, locking grip

    Handlebars

    Alloy Mini Rise, 9-degree backsweep, 15mm rise, 31.8mm

    Saddle

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

    SeatPost

    Alloy, 2-bolt, 14mm offset, 27.2mm

    Seat Binder

    Bolt-type, 31.8mm

    Brakes

    Front Brake

    Tektro HD-R510, hydraulic disc, 160mm

    Rear Brake

    Tektro HD-R510, hydraulic disc, 160mm

    Drivetrain

    Shift Levers

    SRAM NX, 11-speed

    Rear Derailleur

    SRAM NX, 11-speed

    Cassette

    SRAM PG-1130, 11-speed, 11-42t

    Chain

    KMC X11, 11-speed w/ Missing Link™

    Crankset

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

    Chainrings

    40T

    Bottom Bracket

    Threaded BSA 68mm, 24mm spindle

    Wheels & Tires

    Rims

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

    Front Hub

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

    Rear Hub

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

    Spokes

    Stainless, 14g

    Front Tire

    Pathfinder Sport, 700x38mm

    Rear Tire

    Pathfinder Sport, 700x38mm

    Inner Tubes

    700x28/38mm, 48mm Presta valve

    Accessories

    Pedals

    Specialized Body Geometry Fitness, platform, plastic

    * Weights based on production painted frames as pictured. Actual weights will vary based on colourway, frame size, and component variation. Specifications are subject to change without notice.

    Geometry

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    XXSXSSMLXL
    Crank Length165mm165mm170mm170mm175mm175mm
    Handlebar Width680mm680mm680mm680mm680mm680mm
    Stem Length60mm60mm70mm80mm90mm100mm
    Saddle Width155mm155mm155mm143mm143mm143mm
    Seatpost Length300mm300mm350mm350mm400mm400mm
    Stack587mm590mm606mm635mm651mm672mm
    Reach355mm371mm376mm382mm386mm398mm
    Head-Tube Length111mm125mm143mm169mm186mm208mm
    Head-Tube Angle69.5°70°71°71°71°70°
    B-B Height284mm284mm284mm284mm284mm284mm
    B-B Drop70mm70mm70mm70mm70mm70mm
    Trail78mm75mm75mm68mm68mm68mm
    Fork Length (full)395mm395mm395mm395mm395mm395mm
    Fork Rake/Offset51mm51mm51mm51mm51mm51mm
    Front-Center602mm618mm629mm634mm644mm663mm
    Chain-Stay Length440mm440mm440mm440mm440mm440mm
    Wheelbase1033mm1049mm1060mm1065mm1074mm1093mm
    Top-Tube Length (horizontal)529mm549mm559mm573mm581mm599mm
    Bike Stand-Over Height722mm750mm778mm810mm831mm700mm
    Seat-Tube Length360mm395mm440mm470mm510mm530mm
    Seat-Tube Angle73.5°73.5°73.5°73.5°73.5°73.5°
    Geometry

    Rider Reviews

    • 4.7
    • 27 Reviews

    Nice light bike

    Geometry and riding position suit me perfectly. Would like to have a larger chainwheel (42) but it can't be changed. Wonder why the front wheel right side spokes aren't laced properly. Fender mounts aren't very strong. Have had 3 break already, after1000km. and that's on sealed roads and streets (some a bit rough). Have made steel ones. Wheel bolts should be left hand thread when inserted from the left side. Other than that. Nice light bike. Len


    Name:
    Len

    Helpful?

    Specialized Sirrus X 4.0 = Great Bike

    I am happy with the choice I made. The Sirrus X 4.0 is a light and quick bike. I would have preferred a better component group set, compared to the Giant I was considering. So far the components are working very well, but will have to judge them after breaking the bike in more. I am impressed with Specialized. This is my second specialized bike. I purchased a MTB many years ago. It was also an awesome bike.

    Would Recommend?
    Yes!

    Verified Buyer

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    Name:
    James A.

    Helpful?

    Very comfortable for slow casual rides, but Future Shock is horrible.

    I bought the Sirrus X 4.0 and returned it within the 30 day window (Specialized with really good/fast with the return/refund, but the bike store tired to charge me an addtional fee, thankfully Specialized stepped in!). I liked the geometry of the Sirrus x 4, and for slow, level riding, it is very comfortable. However, if you go up hills, or increase the tempo in the slightest, the future shock and bars starts bopping up and down detracting from effeciency and handling. I actually felt unsafe with the Future Shock. The Future Shock is designed in a way that you are detached from the bars/steerer tube, so it is hard to gain leverage/torque on the pedals by pushing/pulling on the bars. With a normal fork based shock, you stay connected to the frame/pedals/bars so all the parts work in unison, but the Future Shock left me feeling out of sync with the bike.

    Would Recommend?
    Yes!

    Name:
    Ken

    Helpful?

    Nice looking, easy to ride!

    Nice looking, easy to ride!

    Would Recommend?
    Yes!

    Verified Buyer

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    Name:
    Yiming X.

    Helpful?

    Versatile bike with smooth ride

    Purchased my first x4.0 six months ago and like every aspect of the bike. Relatively light and nimble and routinely ride 30 miles mostly on streets. The future shock and carbon fork absorb most bumps and the XL size fits my 6”6” frame well. I like the bike so much I just purchased a second one to keep at a lake house.

    Would Recommend?
    Yes!

    Name:
    Gary

    Helpful?

    Great value for money

    Great value for money

    Would Recommend?
    Yes!

    Verified Buyer

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    Name:
    Bradley A.

    Helpful?

    Sirrus x 4

    This bike is perfect for the trails , I changed my tires up to 42 mountain bike and wow what a bike ! Great for every experience! It’s so light with the carbon fork !


    Name:
    Benny

    Helpful?

    Super Happy with the Sirrus X 4.0

    Really happy with the Sirrus X 4.0 in size Medium. I own and sold a Sirrus X 5.0 full carbon 2021 model and it was sweet bike but size large was too big. Medium is the sweet spot for me and I'm super happy to have a proper fit. This bike is agile and quick, love the future shock and SRAM drivetrain, my local Dealer CycleSmiths in Louisville, KY was knowledgeable and great to work with. I would highly recommend this bike for fitness, short to medium rides over mixed terrain.


    Name:
    Lee

    Helpful?

    Sirius X 4.0 - A Brilliant Bike

    I've come from a mountain bike but the truth is I bought the wrong bike and I don't really do the mountain bike stuff any more (if I ever did), it's all roads, trails and dirt tracks and it was hard work keeping up with my pal on his hybrid. I did not want a full road bike and the gravel bikes all seem to have drop bars which I don't want either - enter the Sirrus X 4.0 - straight bars and geometry that makes it feel sharp, a bigger 40 tooth chainring up front and a 11-42t rear cassette gives more speed than my mountain bike ever could. I've had it for a couple of months now and I love it, its quick to turn, fast, agile, I started modifying straight away knowing it was a keeper, EESilk+ saddle stem (makes the overall suspension perfect-works brilliantly with the future shock) and a SunRace MX80 11-51t cassette cassette just made the whole experience perfect for me, but it could not have been done without the Sirrus X 4.0 being a brilliant base bike right out of the box.


    Name:
    Iain

    Helpful?

    Best after sales service and

    Best after sales service and quality bikes

    Would Recommend?
    Yes!

    Verified Buyer

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    Name:
    Stephen I.

    Helpful?