Which size or configuration labels have geometry for the 2018 Norco Threshold A Tiagra?

Geometry is listed for 45.5, 48, 50.5, 53, 55.5, 58, and 60.5.

What are the reach and stack of the 2018 Norco Threshold A Tiagra in size 53?

In size 53, reach is 379 mm and stack is 553 mm.

What is the head tube angle of the 2018 Norco Threshold A Tiagra?

The head tube angle is 71.25 degrees in size 53.

What does the 2018 Norco Threshold A Tiagra ship with?

The stock build includes Shimano Tiagra ST-4700 10spd w/Adjuster, Schwalbe Rapid Rob 700x35c, Shimano Tiagra ST-4700, and Norco Flare - Black.

Which years of the Norco Threshold are on Quiver?

Quiver has the Norco Threshold for 2018, 2021, 2020, 2019, 2017, and 2015.

2018

2018 Norco Threshold A Tiagra

Reach 368 to 404 mm, stack 512 to 608 mm. The Threshold A Tiagra build comes with Shimano Tiagra RD-4700 shifting and Schwalbe Rapid Rob 700x35c tires.

Compare geometry

Source: norco.com. Checked Oct 24, 2026.

Key facts

Brand: Norco
Model: Threshold
Model year: 2018
Frame: A Tiagra
Geometry labels: 45.5, 48, 50.5, 53, 55.5, 58, and 60.5
Drivetrain: Shimano Tiagra RD-4700
Geometry: Complete for every size
Source: norco.com
Checked: Oct 24, 2026

Geometry by size

Geometry drawing, size 53, to scale.

2018 Norco Threshold A Tiagra geometry by size
Measurement	45.5	48	50.5	53	55.5	58	60.5
Reach(mm)	368	370	374	379	386	395	404
Stack(mm)	512	523	537	553	570	588	608
Head tube angle(°)	69.5	70	70.5	71.25	72	72.25	72.5
Seat tube angle(°)	75.5	75	74.5	74	73.5	73.25	73
Effective top tube(mm)	500	510	522.5	537.5	555	572.5	590
Chainstay length(mm)	420	420	420	422.5	422.5	425	425
Wheelbase(mm)	1001	1003	1007	1010	1016	1032	1044
BB height(mm)	275	275	275	275	275	276.5	276.5
Standover(mm)	733	749	767	785	804	826	847
Seat tube length(mm)	455	480	505	530	555	580	605
Head tube length(mm)	95	105	117.5	130	145	165	185

How to read a geometry chart

Stock build

11 parts

Drivetrain

Shimano Tiagra ST-4700 10spd w/Adjuster

Shifter

Shimano Tiagra RD-4700

Derailleur

Shimano Tiagra CS-4700 11-32T 10 speed

Cassette

KMC X10

ChainSpeeds 10

FSA Omega Cross 46/36T - Black

Crankset

FSA MegaExo BB-4000

Bottom bracket

Wheels & Tires

Schwalbe Rapid Rob 700x35c

Tire

WTB STp i19 - Black

Rim

Brakes

Shimano Tiagra ST-4700

Brake

Cockpit

Norco Flare - Black

Handlebar

Norco Super Griptacular w/Gel - Black

Grips

Keep your Threshold A Tiagra in Quiver

Start from this build's stock parts, then record your upgrades. Review it before adding it to your garage.

Free on App Store Free on Google PlayFree for your first bike, on iPhone and Android.

Already have Quiver? Open this build

Keep the factory build and your current parts distinct

Quick answers

Which size or configuration labels have geometry for the 2018 Norco Threshold A Tiagra?: Geometry is listed for 45.5, 48, 50.5, 53, 55.5, 58, and 60.5.
What are the reach and stack of the 2018 Norco Threshold A Tiagra in size 53?: In size 53, reach is 379 mm and stack is 553 mm.
What is the head tube angle of the 2018 Norco Threshold A Tiagra?: The head tube angle is 71.25 degrees in size 53.
What does the 2018 Norco Threshold A Tiagra ship with?: The stock build includes Shimano Tiagra ST-4700 10spd w/Adjuster, Schwalbe Rapid Rob 700x35c, Shimano Tiagra ST-4700, and Norco Flare - Black.
Which years of the Norco Threshold are on Quiver?: Quiver has the Norco Threshold for 2018, 2021, 2020, 2019, 2017, and 2015.