CyberFront SL-B 43g
Tech info
Description
Brompton specific classic J-bend spokes, 2.8mm holes. 16-20-24H.
Compatible with A-C-P and T-Line
74mm wide, oversized 14mm axle.
Hub is supplied with special Titanium bolts for extreme light wheel securing (B-Lock system).
Low-friction sealed cartridge bearings with external hexagonal preload tuner.
Black anodized body with laser etched graphics, "Hart-Coated" axle-ends.
Weight: 43g (B-Lock special securing system 3+3g)
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
How to measure "Spoke-End-Diameter"
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.
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).
This is the correct caliper positioning inside the rim (don't cut your rim!)
4) A-2B = "Spoke-End-Diameter".
Bearing Options
All Extralite hubs and wheels are offered with a choice of ready installed bearings among the best available today.
All bearings feature low-friction rubber seals on both sides.
Hyper hubs, that are specifically designed for off-road use, feature an additional external O-r seal that protects the bearing seals.
Internal bearing selection
Each bearing unit is individually selected by Extralite staff, we check seal drag, rolling smoothness then select and divide them 3 different fitting classes of internal diameter, each class is 2 microns by the next one.
Despite all our bearings come directly from very high quality manufacturers our staff individually checks each unit for rolling smoothness and bore dimensional tolerance.
Extralite staff checks rolling smoothness and seal drag resistance first, then all the units passed are selected and divided in 3 different fitting classes of internal bore, each class is 2 microns by the next one. All that allows our famous truly perfect axle to bearing fitting that together with our precise bearing preload offers very high mileage with minimal rolling resitance.
| Abec5 Steel bearings | Famous Abi-Enduro ABEC 5 precision bearings Standard equipment for all Extralite Road hubs |
|
 |
Plus | Minus |
|
High mileage Good rolling resistance High impact resistance Average best choice for dry environments |
Sensible to water & moisture inside the hub | |
| ABI 440C Stainless bearings | Abi-Enduro precision 440C Stainless bearings Standard equipment for all Extralite MTB hubs 4-5g average weight-saving on the hubset (compared to Abec5) |
|
 |
Plus | Minus |
|
High corrosion resistance Highly resistant to water/moisture (inside hub too) Medium-high impact resistance Average best choice for humid environment |
Medium mileage Medium rolling resistance |
|
| HYC HyperCeramic | Extralite Hi-tech Ceramic bearings, hyper-low friction factor Extremely durable and smooth, never-rustable 5-6g average weight-saving on the hubset (compared to Abec5) |
|
|
Stainless Races: AMS5618 Cryogenically treated Really trick! |
Plus | Minus |
|
Low rolling resistance Low weight High mileage High impact resistance Highly resistant to water/moisture (inside hub too) Best choice for max racing performance and durability |
Installation requires very good skills | |
|
XD-15 Ceramic
|
Enduro trickiest Ceramic bearings |
|
 |
Plus | Minus |
|
Low rolling resistance Highest mileage Fully openable and rebuildable Highly resistant to water, moisture and salt Best choice for max racing performance and durability |
Expensive Installation requires very good skills |
|
Read well these basic info before ordering the parts.
Bearing replacement is not an easy operation as it may seem.
Additionally the installation of any kind of Ceramic bearings requires a very good specific expertise.
Extralite offers complete tool-sets for hub maintenance: the Pro-tool kit 1 and Bearing-sitter includes bearing inserting tools in every bearing sizes used on UltraHubs / HyperHubs / CyberHubs.
If your hub was originally equipped with standard bearings it will probably require micro-tolerance adjustments to axle and bearing fittings, this
to allow proper bearing rotation and durability (these operations are for real experts only). Alternatively send your hub to us for this servicing.
Read well Bearing Installation Tips before attempting a bearing replacement.
This option has been offered till 2024
|
HDC Heavy-Duty Ceramic
|
Hi-quality Heavy-Duty Hybrid Ceramic bearing |
|
 |
Plus |
Minus |
|
Good mileage Low rolling resistance Medium-high impact resistance Medium resistance in humid environment Good choice for best racing performance |
Complex installation Sensible to water & moisture inside the hub |
|
Manuals
Spare Parts
Spare Parts
19,13 €
8,70 €
10,43 €
6,96 €
33,91 €
16,52 €
10,43 €
16,52 €
60,00 €
31,30 €
103,48 €