CyberRear SL-2B 128g

Light, clean and clever

The smart securing system does not require Quick Release, for a further weight saving Micro-tuner: our easy and quick external bearing preload system that ensures precise bearing tuning, smooth running and no play at the rim

Stilish Tensioner bolt for the A and C Line gives a light and nice touch The first Brompton hub compatible with all setups: A,C,P and T-Line

Titanium Bolts heads gives a clean look without hurting you when bike is folded and carried

Equipped with 4 high quality Abec5, stainless or Hybrid-Ceramic bearings Bearing dimensions are one step beefier than most and much heavier competitors

As every Extralite product CyberHubs exceed UNI/DIN Safety standards

Configure

Brompton specific rear hub, compatible with A-C-P and T-Line, 20 or 24h.
Optimized spoke camber, Ø 2.8mm spoke holes for classic J-bend spokes.
Compatible cogs: up to 6 speed cogs (individual cogs) up to 7 speed cogs (one-piece construction).
Oversized axle Ø17mm (112mm width), ABEC5 cartridge bearings (high load capacity) with external preload tuner.
Hub is supplied with special Titanium bolts for an extremely lightweiht wheel securing (B-Lock system).
Oversized and sealed freewheel mech, OR-spring, Titanium 32T ratchet wheel.
Black anodized hub-body with laser etched graphics.

Weight: 128g (B-Lock special securing system 7.8g - Tensioner bolt 3.8g)

…More Tech Details

Drillings Model - Rear derailleur Bearings

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Description
Hub Dimensions
Wheel building
Spoke-end Diameter
Manuals
Spare Parts

Tech info

Description

Hub Dimensions

Wheel building

CyberFront SL-B / CyberRear SL-2B wheel-building

Here you find all the necessary instructions to realize your dream wheels with pre-calculated spoke lengths

Follow instruction step by step:

1)Measure your "spoke-end diameter" (not ERD)

2)Find front hub spoke length on table A

3)Find your rear spoke length (left side) on table B

4)Find your rear spoke length and lacing pattern (drive side) on table C

(All measures are expressed in mm)

4)Lace the wheel respecting correct lacing pattern (see below)

Maximum spoke tension:- Refer to specific manuals

Warning: spoke lacing and tensioning require skills and experience, refer to an expert professional wheel builder for these operations

1) "Spoke-End-Diameter"

Rim manufacturers always offer ERD figures however we warmly recommend to precisely measure the rim+nipple combination

Basically a correct spoke calculation requires exact "spoke-end diameter" and rim drilling

Spoke-end diameter depends on your rim internal diameter and nipple type

2) CyberFront SL-B

Radial lacing - J-bend spokes (any drilling count)

Spoke-end Diameter	Spoke Length
310	140
315	142
320	145
325	147
330	150
335	152
340	155
345	157
350	160

Table A

Note: We list "spoke-end diameters" every 5mm step. If your "spoke-end diameter" measure is in between 2 steps adjust your spoke length consequently

Radial lacing is allowed on internal and external flange side and only with D/B spokes (central section equivalent to Ø 1.5mm)

3) CyberRear SL-2B

Left side - Radial lacing - J-bend spokes

Spoke-end Diameter	Spoke Length
310	139
315	142
320	144
325	147
330	149
335	152
340	154
345	156
350	159

Table B

Lacing: radial on interal flange side, use only D/B spokes (central section equivalent to Ø 1.5mm)

4) CyberRear SL-2B

Drive side - J-bend spokes

Spoke-end Diameter	Spoke Length 24H	Spoke Length 20H and 28H
310	158	166
315	160	168
320	163	171
325	165	173
330	168	176
335	170	178
340	173	181
345	175	183
350	177	185

Table C

Lacing: correct lacing patterns with elbow spokes must be as shown below

Spoke-end Diameter

How to measure "Spoke-End-Diameter"

Spoke-end diameter depends on your rim and nipple type and length.

Below you see how to measure SED for both nipple types:
External nipple configuration
Internal nipple configuration

Take measures very precisely because a well correct nipple/spoke assembly accepts a spoke-length tolerance of +/-1mm only.
(All measures are expressed in mm)

External nipple configuration

1) Insert two J-spokes (random size) with the nipples (of your final build) into 2 opposite rim holes.

This simple trick helps to keep spokes aligned and slightly tensioned.

2) Precisely measure distance between nipples.

Be careful to take measure between the 2 nipple-ends.

3) Add 2x by the nipple height (of your final build) to the measure above.
This gives "Spoke-End-Diameter".
Note: with slotted nipples measure height inside the cut.

cutted nipple

Internal nipple configuration

You can get the necessary data following the procedure below:
1) Precisely measure outer rim diameter (A).

2) Insert a nipple of your final build into a hole (use a spoke to hold nipple in position).
3) Precisely measure distance between nipple-top and outer rim diameter (B).