Which size or configuration labels have geometry for the 2018 Specialized Roubaix Expert UDi2?

Geometry is listed for 49, 52, 54, 56, 58, 61, and 64.

What are the reach and stack of the 2018 Specialized Roubaix Expert UDi2 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 Expert UDi2?

The head tube angle is 73.5 degrees in size 56.

What does the 2018 Specialized Roubaix Expert UDi2 ship with?

The stock build includes Shimano 105 R785 Di2, DT Swiss R460, Shimano RS805, 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 Expert UDi2 geometry and specs

Key facts

Brand: Specialized
Model: Roubaix
Model year: 2018
Frame: Expert UDi2
Type: Road
Geometry labels: 49, 52, 54, 56, 58, 61, and 64
Drivetrain: Shimano Ultegra Di2
Wheels: DT Swiss R460
Geometry: Complete for every size
Source: specialized.com
Checked: Oct 22, 2026

Geometry by size

Geometry drawing, size 56, to scale.

2018 Specialized Roubaix Expert UDi2 geometry by size
Measurement	49	52	54	56	58	61	64
Reach(mm)	369	371	375	381	386	392	403
Stack(mm)	549	569	585	611	644	665	679
Head tube angle(°)	72	72.25	72.75	73.5	73.5	74	74
Seat tube angle(°)	74	74	74	73.5	73.5	73.5	73
Effective top tube(mm)	527	534.9	545	561.8	576.3	588.5	610
Chainstay length(mm)	413	413	415	415	418	418	418
Wheelbase(mm)	981	987	987	993	1011	1018	1033
BB drop(mm)	77.5	77.5	76	76	74.5	74.5	74.5
Standover(mm)	715.5	743	762	785	813	844.3	860.8
Seat tube length(mm)	425	462	481	501	522	563	584
Head tube length(mm)	90	110	125	150	185	205	220

How to read a geometry chart

Stock build

12 parts

Drivetrain

Shimano 105 R785 Di2

Shifter

Shimano Ultegra Di2

Derailleur

Shimano Ultegra Di2 GS

DerailleurSpeeds 11

Shimano Ultegra

CassetteSpeeds 11Range 11-28

Shimano Ultegra

Chain

Shimano Ultegra

CranksetChainring interface Direct Mount

Wheels & Tires

DT Swiss R460

Wheelset

Specialized Turbo Pro

TireTPI 60 TPI

Brakes

Shimano RS805

Brake

Cockpit

Specialized Comp Hover

Handlebar

Seatpost & Saddle

Specialized CG-R

Seatpost

Specialized Phenom Expert

Saddle

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Manufacturer

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Quick answers

Which size or configuration labels have geometry for the 2018 Specialized Roubaix Expert UDi2?: Geometry is listed for 49, 52, 54, 56, 58, 61, and 64.
What are the reach and stack of the 2018 Specialized Roubaix Expert UDi2 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 Expert UDi2?: The head tube angle is 73.5 degrees in size 56.
What does the 2018 Specialized Roubaix Expert UDi2 ship with?: The stock build includes Shimano 105 R785 Di2, DT Swiss R460, Shimano RS805, 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.