2021 Specialized Sirrus X 4.0 Features
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.
At a Glance
- 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.
- Wide-range 1x11 Shimano Deore shifting delivers precise shifting for the long haul.
Component Specifications
| Frameset |
frame
seat binder
|
| Suspension |
fork
|
| Brakes |
front brake
rear brake
|
| Drivetrain |
shift levers
rear derailleur
cassette
chain
crankset
chain rings
bottom bracket
|
| Wheels & Tires |
rims
front hub
rear hub
spokes
front tire
rear tire
inner tubes
|
| Cockpit |
stem
handlebars
saddle
seatpost
pedals
|
2021 Specialized Sirrus X 4.0
| Bike/Frame Size | XXS | XS | S | M | L | XL |
|---|---|---|---|---|---|---|
| Stack | 587 mm | 590 mm | 606 mm | 635 mm | 651 mm | 672 mm |
| Reach | 355 mm | 371 mm | 376 mm | 382 mm | 386 mm | 398 mm |
| Chain-Stay Length | 440 mm | 440 mm | 440 mm | 440 mm | 440 mm | 440 mm |
| Wheelbase | 1033 mm | 1049 mm | 1060 mm | 1065 mm | 1074 mm | 1093 mm |
| Top-Tube Length (horizontal) | 529 mm | 549 mm | 559 mm | 573 mm | 581 mm | 599 mm |
| Bike Stand-Over Height | 700 mm | 722 mm | 750 mm | 778 mm | 810 mm | 831 mm |
| Seat-Tube Length | 360 mm | 395 mm | 440 mm | 470 mm | 510 mm | 530 mm |
| Seat-Tube Angle | 73.5° | 73.5° | 73.5° | 73.5° | 73.5° | 73.5° |
| Head-Tube Length | 111 mm | 125 mm | 143 mm | 169 mm | 186 mm | 208 mm |
| Head-Tube Angle | 69.5° | 70° | 70° | 71° | 71° | 71° |
| B-B Height | 284 mm | 284 mm | 284 mm | 284 mm | 284 mm | 284 mm |
| B-B Drop | 70 mm | 70 mm | 70 mm | 70 mm | 70 mm | 70 mm |
| Trail | 78 mm | 75 mm | 75 mm | 68 mm | 68 mm | 68 mm |
| Fork Length (full) | 395 mm | 395 mm | 395 mm | 395 mm | 395 mm | 395 mm |
| Fork Rake/Offset | 51 mm | 51 mm | 51 mm | 51 mm | 51 mm | 51 mm |
| Front-Center | 602 mm | 618 mm | 629 mm | 634 mm | 644 mm | 663 mm |
Component Geometry
| Component | XXS | XS | S | M | L | XL | |
|---|---|---|---|---|---|---|---|
| Crank Length | mm | 165 mm | 165 mm | 170 mm | 170 mm | 175 mm | 175 mm |
| Handlebar Width | mm | 660 mm | 660 mm | 660 mm | 680 mm | 680 mm | 680 mm |
| Stem Length | mm | 60 mm | 60 mm | 70 mm | 80 mm | 90 mm | 100 mm |
| Saddle Width | mm | 155 mm | 155 mm | 155 mm | 143 mm | 143 mm | 143 mm |
| Seatpost Length | mm | 300 mm | 300 mm | 350 mm | 350 mm | 400 mm | 400 mm |
Size Guide: 2021 Specialized Sirrus X 4.0
