Extralite UltraRear SPX Hub

Extralite UltraRear SPX Hub
Extralite UltraRear SPX Hub
Extralite UltraRear SPX Hub
Extralite UltraRear SPX Hub
Extralite UltraRear SPX Hub
Extralite UltraRear SPX Hub

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Weight133 grams
Hub Shell Material7075 aluminum
Drive Ring Materialtitanium
Bearing Size6803 (2), 6903 (1)
Axle Diameter17 mm
Wheel Building Dimensions
Left Flange Diameter31 mm (straight pull)
Right Flange Diameterinfo here
Shimano Freehub
Center to Left Flange42 mm
Center to Right Flange20 mm
Campy Freehub
Center to Left Flange43 mm
Center to right Flange20 mm
Product Manuals
SPX Freehub Replacement Instructions
SPX Hub Maintenance
SPX Hub Owners Manual
Extralite UltraRear SPX Hub 24 Hole Shimano $450.00 In Stock


Italian manufacturer Extralite's SPX rear hub is the grandfather of their ultra lightweight SX hub series. The main difference between this and the others is that this SPX features straight pull spokes on both left and right sides which results in an increased bracing angle and an arguably more durable spoke. At 133 grams this is their lightest rear hub.

The Ultrarear SPX 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, especially the SPX 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.