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Sirrus X 4.0

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2021 Sirrus X 4.0

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

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

Cockpit

Stem

Future Stem, Comp

Tape

Specialized Neutralizer, Body Geometry, locking grip

Handlebars

Specialized, alloy, 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

Rear Brake

Shimano BR-MT200, hydraulic disc, 160mm

Front Brake

Shimano BR-MT200, hydraulic disc, 160mm

Drivetrain

Shift Levers

Shimano Deore M5100, 11-speed

Rear Derailleur

Shimano Deore M5100, SGS, 11-speed

Cassette

Shimano Deore M5100, 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

Presta, 48mm valve

Accessories

Pedals

Specialized Body Geometry Fitness, platform, plastic

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

Geometry

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XXSXSSMLXL
Crank Lengthmm
Handlebar Widthmm
Stem Lengthmm
Saddle Widthmm
Seatpost Lengthmm
Stack587mm590mm606mm635mm651mm672mm
Reach355mm371mm376mm382mm386mm398mm
Head-Tube Length111mm125mm143mm169mm186mm208mm
Head-Tube Angle69.5°70°70°71°71°71°
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 Height700mm722mm750mm778mm810mm831mm
Seat-Tube Length360mm395mm440mm470mm510mm530mm
Seat-Tube Angle73.5°73.5°73.5°73.5°73.5°73.5°
Geometry

Rider Reviews

  • 4.8
  • 28 Reviews

I really like my bike, and...

The one thing keeping me from really loving this bike is it has had issues with "slow" shifting since I got it. I'm now trying a new bike shop and the mechanic is saying the derailleur is not well matched to the cassette, size-wise. He's going to replace the derailleur with one that is optimized for the 42t cassette, and hopefully that will do the trick. I will also say that in the first year I had this bike, I upgraded a part in the bottom bracket that fixed an issue where it would start coming loose every few months.


Name:
Leon

Helpful?

Terrific

I’ve been riding sirrus x4 for almost 3 yrs. Almost 5 thousand miles. I’ve replaced chain this year and expect to replace tires next year. Love the bicycle. Looking for recommendations for upgrade on seat. Have the original stock seat and it’s fine but I’d upgrade.


Name:
Thomas

Helpful?

Stevens Point Green CIrcle Bike

Recently bought my SirrisX 4.0/ Having ridden either a Catrike, recumbent bike or a Specialized Como e-bike for the last decade, I can tell you certain muscles have been neglected. The SirrisX drive train shifts "like butter", however I am having an issue with the front gear guard. This bike handles our local gravel bike path as if it was designed just for that purpose. I got an S-works seat and am not sure its worth the $. I recommend getting fitted by a certified technician (as I did at the Hostel Shoppe). In hind site, I would buy this bike again.


Name:
Dale

Helpful?

Specialized Sirrus X 4.0

Bought this for road and smooth off-road. I researched a long time. I absolutely love this bike. It is tight and smooth. Gears shift effortlessly. Super light. The only thing I would change might be the seat. Haven't yet though. Definitely recommend if you are looking to do mostly road and some easy off-road.

Would Recommend?
Yes!

Name:
LG

Helpful?

Go for it

If your reading this you are obviously interested in this model. All I can say get off your pc and go for it. What a fantastic bike. I have had hybrid bikes and road bikes but this one can seriously move. Great gearing, great ride. Only one thing if I’m honest is I may change the saddle.

Would Recommend?
Yes!

Name:
Tony

Helpful?

Best Hybrid Bike Ever

I moved from road to hybrid frame bike about a year and half, and bought myself this beauty Sirrus x 4.0. I have so far accumulated 480 km on the road for fitness mostly on Sunday's morning and I'm so HAPPY with the performance, frame and lightweight unlike the regular heavy MTB. It has some chips and scratches, but it's part of the road I take and it's acceptable the wear and tear. I would definitely with no doubt recommend the Sirrus x and the 5.0 is even better than my 4.0. MAC

Would Recommend?
Yes!

Name:
Mauricio C.

Helpful?

Love my Sirrus X 4.0

I’m relatively new to riding as an adult. I had an old Novara Buzz that served me well commuting but boy is it heavy. I decided to upgrade for my 52nd birthday. I test rode Trek and Giant before I found a Specialized dealer. Once I rode the Sirrus X 4.0 I knew this was the bike. Smooth shifting, super light and absolutely comfortable to ride. I absolutely love it!

Would Recommend?
Yes!

Name:
Michael

Helpful?

Best bike I've ever had

I've had several bikes over the years, the most similar to this one being the Cannondale Quick. None of them even compare as far as comfort, capability, speed, stability, and FUN. If you're looking for a bike that will make you look forward to riding anywhere, here it is.

Would Recommend?
Yes!

Name:
Jamie

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Amazing bike for the buck!

Frame is stiff, yet agile in the turns. Shimano components are spot on, never missing a shift. Single ring up front with derailure in back optimizes ratios and improves efficiency using the best ratios, not the most ratios. thumb and index finger shift levers make changing gears effortless. Hydraulic disc brakes will stop a freight train in the rain! Always there when you touch the levers. Frame geometry is sharp and crisp for handling and weight distribution over axles, yet comfortable for this oversized rider. it's light with the aluminum frame and carbon fork. And the paint finish is gorgeous! Just wait til you see the Specialized logo decals light up at night! Compliments every time i ride! John in Clinton Twp, MI

Would Recommend?
Yes!

Name:
John

Helpful?

Great Bike

Was riding an early '90s mtn bike and bought this Cirrus X 4.0. Like going from a pickup truck to a sports car. Shifts like a dream. Handles well. I like the bigger wheels. Really pleased.

Would Recommend?
Yes!

Name:
Frank

Helpful?