Which size or configuration labels have geometry for the 2018 Specialized Roubaix Sport?

Geometry is listed for 49, 52, 54, 56, 58, and 61.

What are the reach and stack of the 2018 Specialized Roubaix Sport in size 56?

In size 56, reach is 381 mm and stack is 611 mm.

What is the head tube angle of the 2018 Specialized Roubaix Sport?

The head tube angle is 73.5 degrees in size 56.

What does the 2018 Specialized Roubaix Sport ship with?

The stock build includes Shimano 105, Specialized Axis Sport, Tektro Spyre, and Specialized Comp Hover.

Which years of the Specialized Roubaix are on Quiver?

Quiver has the Specialized Roubaix for 2018, 2027, 2026, 2025, 2024, 2023, 2022, 2021, 2020, 2019, 2017, 2016, 2015, 2014, 2012, 2011, 2010, 2009, 2008, and 2007.

2018 Specialized Roubaix Sport geometry and specs

Key facts

Brand: Specialized
Model: Roubaix
Model year: 2018
Frame: Sport
Type: Road
Geometry labels: 49, 52, 54, 56, 58, and 61
Drivetrain: Shimano 105 Ez
Wheels: Specialized Axis Sport
Geometry: Complete for every size
Source: specialized.com
Checked: Oct 22, 2026

Geometry by size

Geometry drawing, size 54, to scale.

2018 Specialized Roubaix Sport geometry by size
Measurement	49	52	54	56	58	61
Reach(mm)	369	371	375	381	386	392
Stack(mm)	549	569	585	611	644	665
Head tube angle(°)	72	72.25	72.75	73.5	73.5	74
Seat tube angle(°)	74	74	74	73.5	73.5	73.5
Effective top tube(mm)	527	534.9	545	561.8	576.3	588.5
Chainstay length(mm)	413	413	415	415	418	418
Wheelbase(mm)	981	987	987	993	1011	1018
BB drop(mm)	77.5	77.5	76	76	74.5	74.5
Standover(mm)	715.5	743	762	785	813	844.3
Seat tube length(mm)	425	462	481	501	522	563
Head tube length(mm)	90	110	125	150	185	205

How to read a geometry chart

Stock build

11 parts

Drivetrain

Shimano 105

ShifterSpeeds 11

Shimano 105 Ez

Derailleur

Shimano 105

DerailleurSpeeds 11

Shimano 105

CassetteSpeeds 11Range 11-32

KMC X11 EL

ChainSpeeds 11

Praxis Alba 2D

Crankset

Wheels & Tires

Specialized Axis Sport

Wheelset

Specialized Turbo Pro

TireTPI 60 TPI

Brakes

Tektro Spyre

Brake

Cockpit

Specialized Comp Hover

Handlebar

Seatpost & Saddle

Specialized Toupé Sport

Saddle

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Manufacturer

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Bikes to compare with the Roubaix

Same kind of bike with the closest frame angles and proportions. Differences are how each one compares to this bike.

2019 Specialized Allez Sport
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2019 Trek Domane SLR Frameset
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2018 Trek Madone Race Shop Limited Frameset
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Quick answers

Which size or configuration labels have geometry for the 2018 Specialized Roubaix Sport?: Geometry is listed for 49, 52, 54, 56, 58, and 61.
What are the reach and stack of the 2018 Specialized Roubaix Sport in size 56?: In size 56, reach is 381 mm and stack is 611 mm.
What is the head tube angle of the 2018 Specialized Roubaix Sport?: The head tube angle is 73.5 degrees in size 56.
What does the 2018 Specialized Roubaix Sport ship with?: The stock build includes Shimano 105, Specialized Axis Sport, Tektro Spyre, and Specialized Comp Hover.
Which years of the Specialized Roubaix are on Quiver?: Quiver has the Specialized Roubaix for 2018, 2027, 2026, 2025, 2024, 2023, 2022, 2021, 2020, 2019, 2017, 2016, 2015, 2014, 2012, 2011, 2010, 2009, 2008, and 2007.