Extralite CyberRear SL Rear Road Hub

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As a designer and manufacturer of high end, super lightweight bicycle components, Extralite is constantly refining and improving their designs. This is evident in their latest line of Cyber road hubs, where great care has obviously been taken to implement minor improvements to make an already stellar product even better. The CyberRear SL is the successor to the UltraRear SLX; on the surface, this hub appears largely unchanged. However, the internals have received a significant update; the delicate freehub bushing has been replaced with a much more durable and reliable cartridge bearing. Additionally, wrench flats have been added to the bearing preload micro-tuner to allow for easier adjustment.

At a mere 134 grams, the CyberRear is the go-to front hub for the climber's wheel. Of the few hubs that are lighter than this, none can boast the simple, reliable function and gorgeous execution of Extralite's offering. The CyberRear features a stiff 17mm aluminum axle fitted with common-sized 6803 and 6903 bearings. The road-specific freehub is minimally fitted with a 2-pawl ratchet mated to an oversized titanium engagement ring. As with all Extralite products, the finish work on the hub shell, axle ends, and freehub body is immaculate.

The CyberRear SL features an easily adjustable bearing preload micro-tuner fitted with 17mm wrench flats. This micro-tuner may be adjusted by hand, or with a 17mm box-end or cone wrench. It is imperative that the micro tuner be properly adjusted to avoid damage to the bearings, axle, or the micro tuner itself. CyberRear SL hubs utilize interchangeable axle ends for Campagnolo and Shimano compatibility. This allows for the best possible spoke bracing angles for maximum lateral stiffness.

Extralite products are 100% designed and manufactured in Italy.


We recommend that wheels equipped with Extralite hubs be built by an experienced wheelbuilder. We are happy to provide this service, and can provide helpful suggestions in rim and spoke selections. Please contact us directly or submit a form for a custom wheelbuild.

Extralite hubs feature carefully designed rubber o-ring seals and lightweight ratcheting mechanisms which require frequent service to ensure long life and maximum performance. This service is easily performed with simple hand tools. The included owner's manual details this procedure. Extralite strongly recommends the use of their Alugrease Super 1 when lubricating the CyberRear's internal mechanisms.

Weight134 grams
Bearing Size6903 (1), 6803 (3)
Axle Diameter17 mm
Hub Shell Material7075TX aluminum
Drive Ring Materialtitanium
Wheel Building Dimensions
Left Flange Diameter34.0 mm
Right Flange Diameter52.0 mm
For Shimano Freehubs
Center to Left Flange39.5 mm
Center to Right Flange17.0 mm
For Campagnolo Freehubs
Center to Left Flange39.2 mm
Cetner to Right Flange16.5 mm
Product Manuals
Rear Rim Brake Hubs
QR 130
Freehub Body:
Shimano Road 11
Freehub Body: