Replacement G Line and G line electric Brompton headset
This is a replacement Brompton headset as used on the Brompton G line and G line electric Brompotn bicycles as introduced in 2023
Size: 1 1/8 inch
Tools required:
- 4mm allen key / hex wrench
- Torque wrench
- Suitable grease
Fitting the headset:
- Lightly grease all bearings and mating surfaces, including the head and thread of the bolts
- Apply a small amount of grease inside the fork steerer (FS)
- Avoid getting the grease clamping surfaces
- Fit the headset angular contact bearing (HB L) to the fork (as shown in the data sheet included in the headset)
- Fit the upper angler headset bearing (HB U) to the top of the head tube
- Fit the headset compression ring (HCR) followed by the headset steerer seal (HS-RS) and headset ring (HSRS)
- Fit the steerer hinge clamp (SHC) over the fork steerer (FS) and tighten the preload bold to 4Nm using a 4mm Allen (Hex) key
- Unfold the handlebar support and align the handlebar with the front wheel
- Partially tighten the righthand steerer hinge clamp bolts bolts (SHCB-3 and 4) on the right of the fork, followed by the two bolts on the left
- Take the bike out of the stand and check the alignment of the handlebars
- Tighten the bolts to 8Nm following the same sequence
- It is very important to tighten the bolts to the correct torque
Removal:
- To separate the steerer hinge clamp (SHC) and the fork steerer (FS), fold the handlebar stem to reveal the pinch Bolt (PB) int he center of the steerer hinge clamp (SHC)
- Undo the bolt and remove it
- Undo the 4 steerer hinge clamp bolts (SHCB) by 3 - 4 turns
- Do not remove completely to prevent the steerer clamp plate from falling out
- Gently twist the steerer hinge clamp and pull upward to seperate form the fork steerer
Colour: Black
Do not try to adjust the steerer stop band, this requires specialised tools
Brompton Q part code: Q103697
Note this headset is not compatible with the A, C, P or T line Brompton bicycles