CyberRear "B" freewheel assembly 41g

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Freewheel assembly for CyberRear SL-2B, CyberRear SP2B, CyberRear SP2B+ (Bromptom specifc hubs). Fits standard cog or upgrades up to 6 individual cogs or 7 cogs one piece construction type. Includes freehub body, pawls, O-ring spring, O-ring seal, ABEC5 bearings and 5cc of Alugrease Super1.

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Freewheel Bearings

103,48 €

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Description
Bearing Options
Manuals
Compatible with

Tech info

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 and occasional bike washing	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 and/or frequent bike washing	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 Triple-polishing process (RA / RC-RP-RV) Ra 0.10 Balls: Grade 3 Silicon Nitride with HIP processing Seals: Hi-quality Low-friction lip-labyrint 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 Extremely durable, never-rustable 4-5g average weight-saving on the hubset (compared to Abec5)
https://cycling.endurobearings.com/pages/enduro-innovations#xd15	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 5g average weight-saving on the hubset (compared to Abec5)
	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