Italian manufacturer Extralite's SLX rear hub is an evolution of their ultra lightweight SX hub series. The minor difference between these two hub designs is the drive side flange. Where the SX uses an unconventional straight pull flange, the SLX incorporates a standard flange designed for J-bend spokes. With a weight penalty of less than 5 grams, this standard flange allows for a wider choice of spokes and simplifies the building process. With its increased cassette clearance, the SLX requires no spacers for use with 11 speed Campagnolo.
The Ultrarear SLX is one of the lightest rear road hubs available, with a design that promises performance on par with much heavier models. A tool-free micro adjuster allows for optimum bearing preload, while the high quality steel cartridge bearings are optimized for low drag.
Extralite's SX, SLX, and SPX hubs utilize interchangeable axle ends for Campagnolo and Shimano compatibility. This allows for the best possible spoke bracing angles for maximum lateral stiffness.
As with all Extralite products, UltraHubs exceed the European UNI/DIN Safety standards. Extralite's safety tests simulate a very strong 90kg (200lb) rider output.
We recommend that 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 here.
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. An instruction manual for UltraRear 2.0 hubs is provided here:http://www.extralite.com/Manuals/UltraRear%20SLX%20Version%202.pdf
Extralite strongly recommends the use of their Alugrease Super 1 when lubricating the UltraRear's o-rings, bushings, and drive rings.