UltraRear SLX 139g.

High performance with the ease of regular elbowed spokes.


Weight: 139g.

Drillings: 20h,24h,28h,32h.

Material: special AL7075TX & Grade5 titanium.

External Bearings: 6803-SRS/6803-2RS ABEC5 cartridges.

Internal Bearings: 6903-SRS ABEC5 main axle & Ertalite® bushing.

Compatibility: Shimano-Sram 8/9/10S, Campagnolo 9/10/11s, Shimano 11S.

Axle construction: multishaped 17mm, milled to micro tolerances.

Body construction: 3D multiaxial machining, all in 1 stage.

Finishing: black anodized body, "hart-coated" axle-ends.

Micro-tuner: the quickest bearing preload system.

Freewheel: Hyper engineered 2pawls OR-Drive.

Graphics: laser etched.

Optional: ZeroUp-R hybrid-ceramic bearings.


Micro-tuner: our easy and quick external bearing preload system that ensures precise tuning, smooth running and no play at the rim.

Equipped with ABEC5 cartridge bearings featuring Grade 5 Chromium Steel Balls, 52100 Hi-Carbon Chromium Alloy Races, Nylon-Graphite Ball Retainers, Removable Snap Ring Seals. Fully serviceable.


Special low friction SRS axial seals on main hub bearings, 2RS protective seals on freewheel bearing.

Titanium ratchet wheel with a precise 30T pawl engaging system.


Camber details:

To further optimize wheel stiffness we provide specific Campagnolo and Shimano/Sram axle-ends that are optimized around the cassette dimensions of each manufacturer's standard.

The black finished "Extreme Camber" axle-ends allow Shimano/Sram setups to gain 1.5mm more camber on the drive side. This makes UltraRear SX equipped wheels at least 5% laterally stiffer than any other hub on the market.

High-performing custom wheels have never been this easy to build!

Here you will find pre-calculated spoke lengths, spoke patterns and wheel building tips:

UltraRear SLX lacing instructions


Optional bearings
ZeroUp-R ceramic balls bearings sport the latest generation of hi-tech features:
Grade 3 Balls made in the USA, Magnetite rust proof finish, ABEC 5 Precision, silicone VV Seals, 3-times cryogenic race treatment.

Please read general information about Hybrid-Ceramic bearings and their durability.


As with all Extralite products UltraHubs exceed UNI/DIN Safety standards. Safety tests simulate a very strong 90kg (200lb) rider's output.

100% made in Italy