XC / Lightweight
Mortirolo
Fourteen gears, 1,710 grams. The climber's gearbox.
14 gears · 568% range · 1,710 g · 210 Nm input
The Mortirolo is named after the climb that decides races, and it is built for riders who spend their time going up. Fourteen gears across a 568% range, with tight 14.3% steps that let you hold cadence within a few RPM on a long ascent, in a unit that weighs 1,710 grams with oil.
Weight came out of the Mortirolo through section analysis, not omission. The thin-wall housing keeps full sealing and the same double-lip seal package as our trail units; the gearset runs a finer tooth module with narrower faces, appropriate to XC pedaling loads rather than bike-park impacts. The 210 Nm input rating still clears hard out-of-saddle efforts with margin.
The result is a drivetrain that weighs in close to a conventional XC group once you remove the cassette, derailleur, and shifter hardware it replaces — but with its mass at the crank instead of the rear axle, and with no exposed parts to foul, bend, or re-index mid-race.
Specifications
| Gear count | 14 |
|---|---|
| Total gear range | 568% |
| Step between gears | 14.3% avg |
| Unit weight (incl. oil) | 1,710 g |
| Max input torque | 210 Nm |
| Housing | CNC 7075-T6 aluminum, thin-wall |
| Lubrication | Sealed oil bath, low-viscosity |
| Service interval | 10,000 km oil change |
| Interface | Helicala TM splined mount |
| Shifter compatibility | Trigger or grip, cable-actuated |
| Drive output | 28T cog, chain or belt |
Engineering notes
The Mortirolo's housing is machined to a 2.2 mm nominal wall — about as thin as we can go while passing our full impact protocol — with internal ribbing carrying bearing loads into the mount face. Gears are narrower and run a finer module, paired with a low-viscosity oil blend to cut churning losses at high cadence.
Fourteen gears at 14.3% steps exist for one reason: holding a precise cadence on long climbs. The 568% range means a single setup covers everything from seated switchback grinds to a full sprint.
Compatible frame standards
- Helicala TM mount
- Six-bolt splined interface, published as an open spec for frame builders.
- Pinion P-line bolt pattern
- Direct fit to frames designed around the Pinion P-line bridge via adapter plate.
- Belt drive ready
- Stainless output cog compatible with common 12 mm carbon belt systems.