Clear Icon
Search Icon
Clear Icon
Search Icon
Pinch Zoom Icon
Pinch to Zoom
Pinch Zoom Icon
Pinch to Zoom
Rotate Phone Icon
Rotate screen for larger image

2021 Sirrus X 4.0

4.7

29 Reviews

Sirrus X is your ticket to riding more, and to places you never imagined possible.…

Product Details

Add Icon

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.

  • Future Shock 1.5 delivers 20mm of compliance to give maximum comfort and control over the rough stuff.
  • Future Shock 1.5 delivers 20mm of compliance to give maximum comfort and control over the rough stuff.
  • Added Carbon Fork and an A1 SL alloy frame delivers a build 1.6lb (.8kg) lighter than the 3.0 model–no heavy hybrid featuring a mountain style suspension fork comes close.
  • Added Carbon Fork and an A1 SL alloy frame delivers a build 1.6lb (.8kg) lighter than the 3.0 model–no heavy hybrid featuring a mountain style suspension fork comes close.
  • Wide-range 1x11 Shimano Deore shifting delivers precise shifting for the long haul.
  • Wide-range 1x11 Shimano Deore shifting delivers precise shifting for the long haul.

Technical Specifications

Add Icon

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

Add Icon
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

Complete Your Ride

Rider Reviews

4.7

29 Reviews

 

saddle bracket wtf!

Has a top facing nut for saddle leveling but comes with a non-split Specialized saddle. Poor design choice that I curse every time I want to adjust the seat.


Name:
Jeff

Helpful?

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

Helpful?

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?

Amazing bike for cost.

Well now that I’ve put over 100 miles on the X4.0 without any issues at all, I would say it is a great and comfortable bike for longer trips. The posture is comfortable and good enough to power out when needed.

Would Recommend?
Yes!

Name:
Niko

Helpful?

Love my new bike! Shifting

Love my new bike! Shifting is a dream. Looks great too.

Would Recommend?
Yes!

Verified Buyer
Icon
Name:
Jim L.

Helpful?

great bike

Great Bike love the color shift gears smoothly

Would Recommend?
Yes!

Name:
damond

Helpful?

Best bike ever 🙌

Best bike ever 🙌

Would Recommend?
Yes!

Verified Buyer
Icon
Name:
Paul A.

Helpful?

Great ride. Smooth and balanced

Great ride. Smooth and balanced Handles well on gravel and is great on the road.

Would Recommend?
Yes!

Verified Buyer
Icon
Name:
Stephen D.

Helpful?

Met My Expectations

I have used this bike for one season so far. I ride 60 – 80 mile a week. All is working well. The derailleur is smooth and dependable. It shifts quickly. Concerning the cable rattle, I have not heard it, but I am fairly hard of hearing. The bike is light and quick. I mostly ride on paved or hard packed trails. For light off road, it does fine until you come up on mud, roots, or medium to large rocks. My only complaint is the 40t front ring. On paved trails I cannot keep up with my son’s performance road bike.

Would Recommend?
Yes!

Name:
Charles

Helpful?

Love the bike. It’s everything

Love the bike. It’s everything it is advertised to be. I would only change one thing. I would like to be able to put a bigger chainring in the front. Other than that it’s perfect.

Would Recommend?
Yes!

Verified Buyer
Icon
Name:
Guest G.

Helpful?

Great Paved and Gravel Trail Bike

This is bike is perfect for paved and gravel trails. I have ridden it just over 120 miles. 32 miles in one day on a gravel trail (C&O Canal). The gearing and tires work well on and off road. Except deep sand or gravel. The body position is comfortable. Brakes are strong enough. I weigh 330 lbs., I check the wheels and crank daily. Change a couple of small parts to make it fit you. I changed the grips, pedals and seat. I truly enjoy this bike, highly recommended.

Would Recommend?
Yes!

Name:
Edward

Helpful?

Perfect bike for those who like it all

I sold my gravel bike because I just didn’t like the drop bars. I’m so happy with my purchase of this bike. It’s very light yet rides like a dream on gravel and hard packed roads. It’s quick and fun to ride. I really like how I can do it all with this bike.

Would Recommend?
Yes!

Name:
Jackie

Helpful?

Great bike for rail trails

Great bike for rail trails and riding around town,

Would Recommend?
Yes!

Verified Buyer
Icon
Name:
Steve K.

Helpful?

First adult bike

Just picked up this bike almost a month ago and I’m in love. I was really undecided because I wasn’t sure which bike I wanted. This is my first real adult bike and I wanted a bike that could do it all but I didn’t want to spend a ton. I think I made the perfect decision, this bike can handle everything I throw at it and it’s fast! I’m really happy with it and think I made the right decision. I’m really looking forward to this season and really getting into the sport. I would like to do some bike packing this summer. Don’t hesitate, this is a fantastic do-it-all bike!

Would Recommend?
Yes!

Name:
Dan

Helpful?

Lighter than imagined

Sturdy. Light. An easy way to get back into riding after not being in a bike in 17 years.

Would Recommend?
Yes!

Name:
Claire

Helpful?

Very Nice Bicycle

But. I feel the paint job leaves a lot to be desired. Some then areas and developed a chip when nothing hit the spot. Also for this price range the shimano decore m5100 group set is a bit of a let down. Have had it back to shop for adjustments, but still takes several crank rotations 9 to 10 and will skip 9 occasionally. Exceptional handling, light in weight, 11 speed make this fun, yet practical bike to ride

Would Recommend?
Yes!

Name:
Sam

Helpful?

Incredible bike!

I have some time spent riding a 2020 Sirrus X 4.0 and what I can tell you about my own experience is nothing short of amazing and eye opening. This bike with these specific tires are adept at quick zippy shorter road trips with the "speed strip" center. The nobs surrounding it are just enough to grip in almost all hard packed conditions I've ridden. Of course, this bike doesn't rail like a true mountain bike but it's plenty fast, light and comfortable for most well packed single track that doesn't have much in the way of roots. Even then, I have found my Sirrus to be MUCH more capable off-road in the types of single track trails here in Southern New Jersey. Having come from mountain bike riding this bike has kept my other bike in the shed. The ergonomics of the whole bike are just spectacular for me. I'm 5'10" and ride a Medium for reference. My first Specialized bike and I'm seriously impressed with whatever they did to create this marvelous machine! Thank you Specialized.

Would Recommend?
Yes!

Name:
Tony

Helpful?

Great bike, with a few small caveats that can be fixed!

Purchased 2021 model fairly recently from my local dealer. Originally, put my name on the list for Sirrus X 3.0, but this bike came in first and was offered to me. I love that this bike comes with carbon fiber fork and Future Shock - will make it easier on my body going over bumpy trails in my neck of the woods. Overall, looking at older models, it does seem like Specialized has stripped features from lower models and raised prices on higher models. However, with market showing bike shortage, I cannot blame simple economics. Overall, the bike is very light. I am coming from a ""big store"" branded mountain bike that weighed a ton. This bike is very easy to ride. Concerns for cable rattle are real, there is indeed cable rattle when going over bumps. Will ask dealer to install foam insert when I bring it for a 30-day free checkup. No big deal and an easy fix. The complaints here about Shimano Deore derailleur are not necessarily true. After initial tune up, all the speed activate rapidly without a concern. SLX derailleur may be better and may be in my future when replacement is needed, but Deore works really well too. One of the speeds in the middle may not have a perfect match on derailleur position as it makes more sound (which I plan to work on fine tuning), but overall the gear changes are smooth and quick. I frankly don't know how to use all 11 speeds, I think my most common gears are between smallest (fastest) and maybe 5 others. If you are on the easiest gear, you should be climbing a very steep incline. I never have a need to go anywhere close to that even on steep driveway. The bike seems very well built. By no means is it a $5000-10,000 bike, but it is a great starter bike for an active lifestyle. I am able to run 10 miles without much of an issue. Would recommend Sirrus X 4.0 for a road, trail, and gravel enthusiast.


Name:
Eugene89us

Helpful?

BETTER THAN PROMISED

I HAD TO GET HEALTHIER , AND DECIDED TO GET BACK TO CYCLNG. I WENT TO ERIKS AND OVERLAND PARK,KS. THE SALES PERSON SUGGESTED THE SIRRUS 4.0 . I NOW DO 50-70 MILES A WEEK. I LOVE THIS BIKE . BETTER THAN PROMISED I HAVE HAD IT 10 MONTHS


Name:
Kansas S.

Helpful?

Decent ride, needs some upgrade

I've ridden the this bike for 4 months now, almost every day. It's a great rush to ride it. I do mostly city riding, so I did some upgrades and added metal fenders and a rear rack. Actually, I had the shop add those. Then I added a strong light to the front and back. I have some hand issues, so I upgraded the grips to Ergon GP 3L grips with bar ends. That made a huge difference comfort wise, and I can change my hand position. I bought the bike because it has front stem suspension. I guess that works. While I added the grips, I added a discreet rear-view mirror to the left hand grip to see traffic behind me on the city streets, the Hafney bar end bike mirror. That thing is great! I also added a bell and a cell phone holder. The seat on this bike sucks! I didn't want to say that, but I have ridden this multiple months and my butt still hurts. That's my next upgrade. Other than that, the only problem with this bike is that a couple of times while shifting, the chain has jumped off the front sprocket and will sit stuck between the sprocket and the guard. Annoying! All in all, I really like this bike. I would buy it again, but it is not perfect.


Name:
Gunnar L.

Helpful?

Great bike, but internal cable rattle needs to be dealt with

Love the bike! It's light, agile, rolls great with the tires, perfect for commuting! I just can't believe that Specialized left the internal cable routing with out attention. This bike is, after all, meant to be ridden also on trails and paths. The bike is advertised as: ""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."" Well, I did some stuff, and the first thing I noticed was the horrible cable rattle coming from the internal cable routing and the front fork. This, of course, while riding on trails, not in city commuting. Nevertheless, really annoying for this level of, not exactly cheap, bike. I had a Specialized Diverge before and never had issues with cable rattle, so I didn't even think that Sirrus X would be any different. Quick visit to a local bike shop did the trick. They inserted foam tubing over the cable inside the frame and the rattle is now almost completely gone. I hope Specialized deals with this issue with the newer versions of the bike line. As I said, great bike once the cable rattle is gone. The cable rattle issue was with 2020 model.


Name:
Northaholic

Helpful?