2021
2021 Specialized Sirrus 4.0
The 2021 Specialized Sirrus 4.0 sits at the upright end of the range for a commuter bike, with a steeper head angle. Reach 355 to 410 mm, stack 585 to 709 mm. The Sirrus 4.0 build comes with microSHIFT R9 shifting and Specialized RoadSport Reflect tires.
Source: specialized.com. Checked .
Key facts
- Brand
- Specialized
- Model
- Sirrus
- Model year
- 2021
- Frame
- 4.0
- Type
- Commuter
- Geometry labels
- XS, S, M, L, XL, and XXL
- Drivetrain
- microSHIFT R9
- Geometry
- Complete for every size
- Source
- specialized.com
- Checked
Geometry by size
| Measurement | XS | S | M | L | XL | XXL |
|---|---|---|---|---|---|---|
| Reach(mm) | 355 | 371 | 384 | 386 | 398 | 410 |
| Stack(mm) | 585 | 602 | 631 | 649 | 687 | 709 |
| Head tube angle(°) | 70 | 70 | 71 | 71.5 | 72 | 72 |
| Seat tube angle(°) | 73.5 | 73.5 | 73.5 | 73.5 | 73.5 | 73 |
| Chainstay length(mm) | 435 | 435 | 435 | 435 | 435 | 435 |
| Wheelbase(mm) | 1027 | 1050 | 1060 | 1063 | 1082 | 1101 |
| Standover(mm) | 714 | 756 | 788 | 813 | 849 | 875 |
| Seat tube length(mm) | 355 | 416 | 453 | 483 | 533 | 563 |
| Fork length(mm) | 390 | 390 | 390 | 390 | 390 | 390 |
| Head tube length(mm) | 125 | 143 | 169 | 186 | 223 | 246 |
Stock build
7 parts
Drivetrain
Wheels & Tires
Brakes
Seatpost & Saddle
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Quick answers
- Which size or configuration labels have geometry for the 2021 Specialized Sirrus 4.0?
- Geometry is listed for XS, S, M, L, XL, and XXL.
- What are the reach and stack of the 2021 Specialized Sirrus 4.0 in size L?
- In size L, reach is 386 mm and stack is 649 mm.
- What is the head tube angle of the 2021 Specialized Sirrus 4.0?
- The head tube angle is 71.5 degrees in size L.
- What does the 2021 Specialized Sirrus 4.0 ship with?
- The stock build includes microSHIFT R9, Specialized RoadSport Reflect, Tektro HD-R280, and Specialized Power Sport.
- Which years of the Specialized Sirrus are on Quiver?
- Quiver has the Specialized Sirrus for 2021, 2023, 2022, 2020, 2019, 2018, 2017, 2015, 2014, 2013, 2012, 2011, 2010, 2009, and 2008.
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