MTB Headsets

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Upper Cup

Integrated

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External

Lower Cup

External

Integrated (IS)

Zero Stack

Brand

Cane Creek

FSA

Woodman

BBB

Chris King

Ritchey

Deda

XLC

Massi

Neatt

Wolf Tooth

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Parts 8.3

Trek

Chromag

Dartmoor

Funn

SHIS Bottom

EC30/25.4

EC34/26.4

EC34/30

EC44/40

EC49/30

EC49/40

IS41/30

IS42/30

IS47/33

IS47/34

IS51.8/30

IS52/30

IS52/40

ZS42/30

ZS44/30

ZS49/30

ZS55/40

ZS56/30

ZS56/40

SHIS Top

EC30/25.4

EC34/25.4

EC34/28.6

EC49/28.6

EC49/38.1

IS41/28.6

IS42/28.6

IS47/31.6

ZS41/28.6

ZS42/28.6

ZS44/28.6

ZS49/28.6

ZS49/40

Frame Top Diameter

30 mm

34 mm

41 mm

42 mm

44 mm

47 mm

49 mm

Steerer Top Diameter

28.6 mm (1''1/8) mm

31.6 mm (1''1/4) mm

Frame Bottom Diameter

30 mm

34 mm

41 mm

42 mm

44 mm

47 mm

49 mm

51.8 mm

52 mm

55 mm

56 mm

Steerer Bottom Diameter

30 (1''1/8) mm

33 (1''1/4) mm

40 (1.5'') mm

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MTB Headsets

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The bike headset: an essential part of driving

The bike headset is essential in guiding your bike since it allows to rotate the fork and therefore the front wheel.

The MTB headset is the same as the road headset, it's made up of parts with ball bearings that fit into the steering tube of the frame. Concretely, this is a high bottom bracket shell and a low one with bearings in which the steering tube passes.

Different types of headset

Screw-on headset: the fork's pivot is held by a nut and a locking ring nut.
Standard headset (Aheadset): the most common headset, the bearings are located outside the steering tube.
Semi-integrated headset: the bearings are semi-integrated between the cup and the bottom bracket shell.
Integrated headset: the bearings are integrated into the bottom bracket shell.

There are several sizes for the MTB headset depending on the diameter of your fork: 1" (25.4 mm), 1" 1/8 (28.6 mm), 1" ¼ (31.8 mm) and 1" ½ (38.1 mm).