The ultimate Pinion gearbox guide

A Pinion gearbox is a sealed transmission mounted at the bottom bracket, the centre of the bike, where the cranks attach. Instead of a cassette and a derailleur shifting a chain across sprockets at the rear wheel, all the gears live inside one enclosed unit, modelled on automotive transmission design. Power runs through just two sets of cogs at any moment, and the whole system is sealed against water, grit and impact. A single sprocket drives the rear wheel via a chain, or more commonly on a Pinion build, a carbon belt.

The headline numbers tell the story: a 12 speed Pinion offers up to a 600% gear range across evenly-spaced gears, wider than any derailleur drivetrain, with no gaps or overlaps because every gear is a real, distinct ratio. Service is minimal, an oil change roughly every 10,000 km or once a year, and almost nothing else.

There are two main ways to shift a Pinion.

A Pinion is built from two internal sub-units, a finely-stepped set of gears multiplied by a second set, which is how it produces 12 evenly-spaced ratios from a compact box (the same principle as a car gearbox). Because only two cogs are engaged at any time, it stays reasonably efficient despite all those gears. It runs in a self-lubricating oil bath, which is why maintenance is so low. And it's almost always paired with a belt rather than a chain: silent, greaseless, and matching the gearbox's low-maintenance character.

This is where the Pinion earns its keep. A derailleur drivetrain is exposed to everything. It needs regular cleaning, lubing, indexing and periodic replacement of the chain and cassette as they wear, and a knock can bend the derailleur or hanger. A Pinion is sealed: an oil change roughly every 10,000 km or once a year, and effectively nothing else. Paired with a belt instead of a chain, there's no oiling and no chain to stretch or replace. Over the life of the bike, the difference in time and money spent maintaining the drivetrain is large.

The two leading gearbox systems solve the same problem differently: Pinion at the bottom bracket, Rohloff in the rear hub.

The trade-off in a sentence: Rohloff is lighter and a little more efficient; Pinion handles better off-road and needs servicing half as often. For mountain, enduro and rough adventure riding, the Pinion's central, low weight and reduced rear-wheel mass make it the better-handling choice, which is why it, not Rohloff, is the gearbox showing up in World Cup downhill.

Independent testing puts average drivetrain efficiency at roughly 97% for a single-speed, 94.5% for a Rohloff, and 90.5% for a Pinion (around 19W of loss at 200W of rider input). The extra friction comes from the larger crankshaft seals, faster-spinning internal cogs and the gearbox's sealed design.

A Pinion is a premium component, and because it can't be retrofitted, it's inseparable from a custom or specialist frame. That puts a Pinion bike firmly at the upper end of the market: you're buying the gearbox, the belt, and a frame purpose-built around them. The value argument is whole-of-life: high upfront cost, very low running cost, and a drivetrain that lasts.

The routing is planned into the frame, and it differs depending on whether you choose mechanical or Smart.Shift.

A custom-led, specialist proposition. You generally can't walk into a mainstream Australian bike shop and buy a Pinion bike off the floor. It's overwhelmingly a custom-frame or specialist-order decision. A handful of importers, specialist dealers and eBike-specific sellers carry Pinion in Australia, but for a true adventure or gravel Pinion bike built around the gearbox, you're almost always going the custom route. That scarcity is a direct consequence of the technology: because a Pinion has to be built into the frame, it doesn't suit mass production, and it lands naturally in the hands of custom builders.

The market landscape. Globally, Pinion shows up in three places: a small number of production adventure and touring brands (the likes of Schindelhauer, Priority and others), the growing Pinion MGU eBike segment (the integrated motor-gearbox unit), and, most relevant here, custom framebuilders, who increasingly base whole models around the gearbox. For the rugged-adventure and bikepacking rider, the custom builders are where the interesting Pinion bikes live.

The trend that's changing everything: racing. Pinion's biggest shift in profile is happening in World Cup downhill. For the 2025 season, four elite teams moved to Pinion gearboxes paired with Gates carbon belt drives, chasing a €100,000 prize offered for the first elite World Cup win on a belt-drive bike. Long-time gearbox pioneers Zerode and Gamux have raced the technology for years; now the sport's biggest names are following.

Why it matters for buyers: World Cup downhill is the harshest proving ground in cycling, and teams are choosing gearboxes for the same reasons an adventure rider does, durability, weight distribution, and reduced unsprung mass (the rear wheel sticks to the ground better). Each season of high-profile racing normalises the technology and pushes it toward wider adoption. The gearbox is moving from curiosity to credible mainstream alternative, and the most advanced race bikes are now appearing with 3D-printed titanium lugs, the same material-and-manufacturing direction that defines premium custom builds.