CyberRear SP-2B From 116g

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Brompton specific rear hub, optimal spoke camber, straight pull spokes, 2.8mm holes. 20-24H (28H with radial lacing on left side) Compatible with A-C-P and T-Line 112mm wide, oversized axle Ø17mm, ABEC5 cartridge bearings (high load capacity) with external hexagonal preload tuner. Hub is supplied with special Titanium bolts for extreme light wheel securing (B-Lock system). Titanium 32T ratchet wheel, OR-spring oversized and sealed freewheel body. Black anodized hub-body with laser etched graphics. Bearing options: Abec5 Steel, 440C Stainless Steel, Hyper-Ceramic, XD-15 Ceramic. Weight: 116g for 20h HyC Bearings (B-Lock special securing system 7.8g - Tensioner bolt 3.8g)

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Drillings Bike Model - Rear derailleur Bearings

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

Tech info

Hub Dimensions

Wheel building

CyberFront SP-B / CyberRear SP 2B+ wheel-building

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

Follow instructions 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 spcific 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

How to measure "Spoke-End-Diameter"

2) CyberFront SP-B

Radial lacing - Straight pull spokes (any drilling count)

Spoke-end Diameter	Spoke Length
310	143
315	146
320	148
325	151
330	153
335	156
340	158
345	161
350	163

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

3) CyberRear SP 2B+

Left side- Straight pull spokes

Spoke-end Diameter	Spoke Length 24H Crossed Lacing	Spoke Length 20H Crossed Lacing	Spoke Length 28H Radial Lacing
310	154	159	143
315	157	161	146
320	159	164	148
325	162	166	150
330	164	168	153
335	167	171	156
340	169	173	158
345	172	176	160
350	174	178	163

Table B

4)CyberRear SP 2B+

Drive side - Straight pull spokes

Spoke-end Diameter	Spoke Length 24H	Spoke Length 20H and 28H
310	152	159
315	154	161
320	157	164
325	159	166
330	161	168
335	164	171
340	166	173
345	169	176
350	171	178

Table C

Lacing: correct lacing patterns with straiht-pull 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).