ZTTO Headsets – Integrated (IS), Zero Stack (ZS) & External Cup (EC)

NZ$42.00

Upgrade or replace your headset with a ZTTO Threadless Headset, offering quality CNC-machined components and precision bearings without breaking the bank.

Manufactured from 6061 aluminium alloy, these headsets provide a lightweight, durable and clean-looking solution for everything from MTB builds and upgrades to replacing a tired or worn factory headset.

With several Integrated (IS), Zero Stack (ZS) and External Cup (EC) configurations available, there’s an option to suit a wide range of straight and tapered frames and forks.

Features

  • CNC-machined 6061 aluminium alloy components

  • Smooth, precision-made bearings

  • Durable construction for year-round riding

  • Threadless design

  • Options for straight and tapered fork steerers

  • Integrated, Zero Stack and External Cup configurations available

  • Ideal for replacement, upgrade or custom bike builds

  • Black finish

Headset Options

4456ST

  • Upper: ZS44/28.6

  • Lower: ZS56/40 (30)

  • 44mm / 56mm Zero Stack headset

  • Suitable for compatible straight or tapered setups depending on crown race configuration

4252ST

  • Upper: IS42/28.6

  • Lower: IS52/40 (30)

  • 42mm / 52mm Integrated headset

  • Suitable for compatible straight or tapered setups depending on crown race configuration

4444S

  • Upper: ZS44/28.6

  • Lower: ZS44/30

  • Straight steerer configuration

4444T

  • Upper: ZS44/28.6

  • Lower: EC44/40

  • Allows compatible 44mm head tubes to accommodate a tapered 1-1/8” to 1-1/2” fork using an external lower cup

4247T

  • Upper: IS42/28.6

  • Lower: IS47/33

  • For compatible 1-1/8” to 1-1/4” tapered steerers

  • Note: Lower crown race diameter is 33mm — this is not the common 1-1/2” tapered standard

3434S

  • Upper: EC34/28.6

  • Lower: EC34/30

  • Traditional External Cup headset for compatible straight 1-1/8” setups

Specifications

  • Brand: ZTTO

  • Material: 6061 Aluminium Alloy

  • Colour: Black

  • Type: Threadless Bicycle Headset

  • Available Standards: IS / ZS / EC

  • Steerer Options: Straight & Tapered

Headset Code Guide

  • IS = Integrated

  • ZS = Zero Stack

  • EC = External Cup

  • 28.6mm = Typical 1-1/8” upper steerer

  • 30mm = Typical 1-1/8” straight fork crown race seat

  • 33mm = 1-1/4” lower steerer/crown race standard

  • 40mm = Typical 1-1/2” tapered fork crown race seat

Package Includes

  • 1 × ZTTO Headset – Selected Model

TB Tech Tip: Headset standards can look almost identical but aren’t necessarily interchangeable. Before ordering, check the existing headset markings or accurately measure your frame’s upper and lower head tube interfaces and fork steerer/crown race diameter. If you’re unsure, send us your measurements and we’ll help identify the correct option.

Size:

Upgrade or replace your headset with a ZTTO Threadless Headset, offering quality CNC-machined components and precision bearings without breaking the bank.

Manufactured from 6061 aluminium alloy, these headsets provide a lightweight, durable and clean-looking solution for everything from MTB builds and upgrades to replacing a tired or worn factory headset.

With several Integrated (IS), Zero Stack (ZS) and External Cup (EC) configurations available, there’s an option to suit a wide range of straight and tapered frames and forks.

Features

  • CNC-machined 6061 aluminium alloy components

  • Smooth, precision-made bearings

  • Durable construction for year-round riding

  • Threadless design

  • Options for straight and tapered fork steerers

  • Integrated, Zero Stack and External Cup configurations available

  • Ideal for replacement, upgrade or custom bike builds

  • Black finish

Headset Options

4456ST

  • Upper: ZS44/28.6

  • Lower: ZS56/40 (30)

  • 44mm / 56mm Zero Stack headset

  • Suitable for compatible straight or tapered setups depending on crown race configuration

4252ST

  • Upper: IS42/28.6

  • Lower: IS52/40 (30)

  • 42mm / 52mm Integrated headset

  • Suitable for compatible straight or tapered setups depending on crown race configuration

4444S

  • Upper: ZS44/28.6

  • Lower: ZS44/30

  • Straight steerer configuration

4444T

  • Upper: ZS44/28.6

  • Lower: EC44/40

  • Allows compatible 44mm head tubes to accommodate a tapered 1-1/8” to 1-1/2” fork using an external lower cup

4247T

  • Upper: IS42/28.6

  • Lower: IS47/33

  • For compatible 1-1/8” to 1-1/4” tapered steerers

  • Note: Lower crown race diameter is 33mm — this is not the common 1-1/2” tapered standard

3434S

  • Upper: EC34/28.6

  • Lower: EC34/30

  • Traditional External Cup headset for compatible straight 1-1/8” setups

Specifications

  • Brand: ZTTO

  • Material: 6061 Aluminium Alloy

  • Colour: Black

  • Type: Threadless Bicycle Headset

  • Available Standards: IS / ZS / EC

  • Steerer Options: Straight & Tapered

Headset Code Guide

  • IS = Integrated

  • ZS = Zero Stack

  • EC = External Cup

  • 28.6mm = Typical 1-1/8” upper steerer

  • 30mm = Typical 1-1/8” straight fork crown race seat

  • 33mm = 1-1/4” lower steerer/crown race standard

  • 40mm = Typical 1-1/2” tapered fork crown race seat

Package Includes

  • 1 × ZTTO Headset – Selected Model

TB Tech Tip: Headset standards can look almost identical but aren’t necessarily interchangeable. Before ordering, check the existing headset markings or accurately measure your frame’s upper and lower head tube interfaces and fork steerer/crown race diameter. If you’re unsure, send us your measurements and we’ll help identify the correct option.