Extralite | Ultralight Racing Bicycle Parts from Italy | Rubi Workshop

We treat every gram
as a matter of faith.

Extralite is an ultralight racing parts brand founded in Italy in 1995. The company is Studio Riva, led by Sergio Riva. Its first goal was a full-suspension mountain bike frameset under 2kg, rear hydraulic shock included.

Building parts to suit that frame, one by one, the range grew to stems, hubs, cranks and wheels, and by the late 1990s Extralite had completed a full-suspension bike under 8kg. Every product is still designed, machined and assembled in northern Italy.

An hour of machining
leaves 54 grams.

In 1997 Extralite introduced The Stem, with a four-bolt faceplate. It weighed 128g at 120mm. Through several generations it became today's HyperStem, and the same 110mm now weighs 83g.

HyperStem is 3D machined from a 7075 aluminium block on a multi-axis machine for over an hour. The bolts are grade 5 titanium Torx with rounded heads, and every clamp edge is rounded to protect carbon bars and steerers. Recommended torque is 2Nm.

Hubs from the lightest end
that keep on turning.

Extralite hubs come in two families. Hyper, for mountain and gravel, uses an all-alloy front-engagement freehub to handle high torque and mud, a thick 17mm axle and external seals. Cyber, for the road, saves weight with a titanium ratchet, two pawls and four bearings.

Both families set bearing preload from the outside with the micro-tuner. Bearings range from standard ABI-Enduro steel to stainless, HyperCeramic and Enduro XD-15 ceramic.

Sub-kilogram wheels,
built on our own hubs.

Over a decade ago Extralite introduced the offset carbon rim and hookless rim walls on the CarboCamber29, and today's rims have even more offset and wider beads. Every spoke hole on the rim is individually reinforced and reworked so each nipple aligns with its spoke.

Spokes can be carbon, Berd fibre or steel. Light rims reduce rotational inertia for quicker acceleration and changes of direction.

Extralite
for the Brompton.

Extralite designs dedicated Brompton parts. The 16 inch (349) CyberCity 349B carbon wheelset, the Cyber SL-B, SL-2B and SP 2B+ hubs, and the QRC3S-B crankset for the Brompton bottom bracket shell all fit the C, P and T Line, and the short-ratio UltraLevers 3S work with caliper brakes.

Wheels are held by titanium B-Lock bolts instead of quick releases, saving weight, and the smooth bolt heads won't catch your hand when the bike is folded and carried. The C Line uses a dedicated tensioner bolt.

Machining once reserved for prototypes,
on every crank.

The QRC crank began with a design that hollows the section and distributes thickness along the stress path. Today's QRC-3 is 17% lighter and 15% stiffer than the previous generation. Each crankset spends hours on a five-axis machine with point-to-point 3D machining, the care once given only to prototypes.

Chainrings, bottom brackets, pulleys, quick releases and thru axles follow the same principle. Ceramic bearings go where drivetrain friction matters most, and weight is cut to single-digit grams.

Hubs, stems and wheels
that fit your bike.

For hubs and wheels, check the brake type, axle standard and cassette standard first. For stems, check steerer diameter, length and angle. Figures follow Extralite's official technical data, with weight tolerance within 1 to 2%.

From a sub-2kg frame
to a full range of parts.

It began with the goal of a full-suspension frameset under 2kg, and grew to stems, seatposts, chainrings, hubs, wheels, cranks and Brompton parts. Over 30 years Extralite has widened what it makes, but never changed how honestly it weighs it.