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Carbon-Ti X-Rotor SteelCarbon 3

A steel braking track on a carbon fiber body, from 86 grams

$240.00

The X-Rotor SteelCarbon 3 is Carbon-Ti’s semi-floating disc rotor: a steel braking track riveted to a carbon fiber body, made in Italy. The Centerlock version weighs 86 grams at 140 mm and 98 grams at 160 mm. Sold singly, with its own lockring.

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Enjoy free, frictionless U.S. returns when you purchase this item. If it's not quite right, or something else has you in two minds, you can request a pre-paid return shipping label to send it back to us for a full refund. Naturally, some conditions apply. Read our returns policy.
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More about the X-Rotor

The part your pads touch is steel, 1.8 mm thick, and Carbon-Ti says it can be used with any pad. Everything inside it is there to save weight: a carbon fiber body, Grade 5 titanium rivets and washers, and a 7075 aluminum Centerlock adapter behind a laser-engraved titanium plate.

This is the third version, and the first made for Centerlock hubs: the one before it needed a third-party adapter. Carbon-Ti redesigned the track to improve braking, shed heat and wear pads more evenly, and rounded its edges to meet UCI rules. It developed the rotor with UAE Team Emirates, who tested it on the team’s Colnago V4RS race bikes.

Each rotor comes with a low-profile lockring that suits hubs with 12, 15 or 20 mm thru-axles. Carbon-Ti’s weights are for the rotor alone, and the lockring adds 8 grams. We fit X-Rotors to Regroup custom builds, and the one in these photos is on a Mosaic RT-Zero.

Which size do I need?
The one your bike has now: the diameter is marked on the rotor, and your frame and fork are built around it. Most road and gravel bikes run 160 mm at the front and 140 or 160 mm at the rear. Each rotor is sold singly, so a bike needs two. If you’re not sure about yours, ask us before you order.
Will it work with my brakes?
It fits Centerlock hubs, and Carbon-Ti says it can be used with any pad, with organic pads recommended on the 140 mm. It isn’t compatible with Campagnolo and Fulcrum AFS hubs. Fit new pads with new rotors, and bed them in with at least twenty stops from 25 km/h. Carbon-Ti says the braking is at its best after a few hundred kilometers.

Specifications

Sizes
140 mm, 160 mm
Mount
Centerlock
Weight
86 g (140 mm), 98 g (160 mm), without lockring
Lockring
Included, 8 g, tightened to 40 Nm
Braking track
Steel, 1.8 mm thick, 1.5 mm minimum
Body
Carbon fiber
Adapter
7075 aluminum with a titanium protection plate
Rivets and washers
Grade 5 titanium
Pads
Any, organic recommended on the 140 mm
Not compatible with
Campagnolo and Fulcrum AFS hubs
Sold as
A single rotor with its lockring
Made in
Italy
Warranty
2 years

The Finer Details

Steel Track, Carbon Body

Steel Track, Carbon Body

The 1.8 mm steel braking track is riveted to a carbon fiber body with Grade 5 titanium rivets and washers. The edges are CNC-machined round, which is what UCI rules ask for.

Made in Italy

Made In Italy

Carbon-Ti designs and manufactures everything in Italy, in Cazzago San Martino near Brescia. The carbon is cut by waterjet and then CNC-machined, and assembly is done by hand.

On Regroup Builds

On Regroup Builds

We fit X-Rotors front and rear on our custom builds. This one’s on a Parlee Z-Zero GT.

Stories from the Review

All entries
The Sweet Spot: Adam’s Shattered Camo Mosaic RT-Zero July 24, 2026
Adam’s ‘First Fit’ Parlee Z-Zero GT March 6, 2026 Bugatti Factor ONE Number 56 of 250, in Size 56 July 8, 2026

About the brand

Carbon-Ti

Carbon-Ti makes components in carbon fiber, titanium and aluminum near Brescia, all of them in Italy. Its X-Rotor puts a steel braking track on a carbon fiber body, from 86 grams.

Explore Carbon-Ti
Carbon-Ti