Oversize pulleys that drop into your stock cage.

Every other oversize pulley system asks you to replace the entire derailleur cage — a $400 to $700 proposition that adds parts, adds weight, and changes how your derailleur behaves.

ÖGLE doesn't. Each version is sized to the largest tooth count your stock cage will accept without modification. You get the bigger pulleys, the ceramic bearings, and the friction reduction, using the derailleur you already own.

Handcrafted in Barcelona. Available for SRAM Eagle Transmission 12-speed, Red/Force/Rival 12-speed, and Red/Force/Rival XPLR 13-speed.

Where the friction actually is

A rear derailleur loses power in two places, and ÖGLE targets both.

Bearing drag. Stock pulleys typically run basic sealed steel bearings or plain bushings. ÖGLE uses hybrid bearings — ceramic balls in steel races. Ceramic balls are rounder, harder, and lighter than steel, which means less rolling resistance, particularly at the high rotational speeds a small pulley sees.

Chain articulation angle. Every link has to bend as it wraps a pulley and straighten as it leaves. The smaller the pulley, the sharper that bend, and every bend costs energy. Going oversize opens the angle each link travels through, so the chain flexes less to do the same job.

Honest about the magnitude: the mechanism is real, but oversize pulleys and ceramic bearings are a watts-in-single-digits upgrade, not a transformation. Anyone promising you more than that is selling. What you'll actually notice on the first ride is how much quieter the drivetrain runs.

Carbon body, aluminum teeth

Same construction principle as Gemini's RIGEL chainrings, and it answers the obvious objection to a carbon pulley.

Each tooth has a 7075-T6 aluminum core underneath — that's the surface the chain actually contacts and wears against. Carbon fiber is molded continuously around it, with the fibers oriented to follow the tooth profile rather than being cut across it.

That continuous molding is the difference between this and the alternatives. It isn't injection-molded fiber-filled plastic, and it isn't carbon machined from a block — both of those sever the fibers and lose the strength that made carbon worth using. Here the fiber runs unbroken around each tooth, so the structure is carrying load the way carbon is supposed to.

Closed, spokeless design

Most pulleys are spoked, with open gaps between the hub and the teeth. Those gaps let grit, mud, and road spray straight into the bearing area.

ÖGLE is fully enclosed — no spokes, no openings. Debris stays out of the bearings, the profile is cleaner through the air, and the pulley integrates visually with the derailleur instead of looking bolted on.

The assembly is finished with black anodized aluminum end caps, which set bearing preload correctly and keep the whole unit sealed.

Weight

Complete sets, bearings and caps assembled, run between 22 and 29 grams depending on tooth configuration.

Context matters here. That's roughly comparable to the stock plastic pulleys you're removing — the weight story isn't against stock. It's against the alternative upgrade: machined aluminum oversize pulleys from the established aftermarket brands run 40 to 50 grams, and full cage-replacement systems add considerably more than that.

So you're getting oversize pulleys and ceramic bearings without the weight penalty that usually comes attached to them.

Who makes it

Gemini Composites is a small Barcelona workshop founded in 2015 by Roland Baides, a design engineer who spent two years as chief design engineer at Unno before returning to Gemini full time. Design, engineering, and carbon production happen under one roof.

The pulley program came out of more than three years of development and over 500 prototypes, using the same forged carbon process behind their chainrings.

Every set is made by hand. Production is limited to what that workshop can produce.

Choosing your version

Match the version to your rear derailleur, not to your cassette or your frame.

• Eagle Transmission 12-speed — for SRAM T-Type Eagle Transmission derailleurs. The hangerless ones that bolt directly through a UDH frame.
• Red / Force / Rival 12-speed E1 — for SRAM's 12-speed road AXS rear derailleurs.
• Red / Force / Rival XPLR 13-speed — for SRAM's 13-speed XPLR gravel rear derailleurs.

These are not interchangeable. Tooth counts and spacing differ between them, and a set intended for one will not perform correctly on another.

If you're unsure which derailleur you have, look at the model name printed on the cage, or count the cogs on your cassette — 13 means XPLR, and a derailleur with no hanger between it and the frame means Transmission.

Compatibility

• Drivetrains: 1x11, 1x12, 1x13, 2x11 and 2x12
• Cage: Fits stock derailleur cages — no aftermarket cage required
• Bearings: Hybrid, ceramic balls in steel races

Specifications

• Construction: Forged carbon molded continuously around 7075-T6 aluminum tooth cores
• Bearings: High-precision hybrid with ceramic balls
• End caps: Black anodized aluminum
• Design: Fully enclosed, spokeless
• Set weight: 22.2g (12/14) · 23.9g (12/16) · 25.1g (14/16) · 29g (14/20)
• Finish: Natural forged carbon
• Origin: Handcrafted in Barcelona, Spain
• Warranty: 3 years

Installation

Straightforward, and no chain length change is needed. Pull the cage back to take up chain slack, swap the pulleys, and torque the mounting bolts to your derailleur manufacturer's spec.

Pay attention to pulley orientation and to which one goes where — the upper and lower pulleys are not identical, and installing them reversed will make shifting worse rather than better.

Once mounted, fine-tune with your derailleur's micro-adjust rather than assuming the indexing carried over unchanged.

Living with them

Keep them clean and run a dry chain lube where conditions allow. Dry lube pulls less grit into the tooth interface and the bearing seals, which is what determines how long any pulley lasts.

The bearings are sealed and don't require regular service. If the drivetrain starts sounding less smooth than it did, that's usually a chain-wear problem before it's a bearing problem — check the chain first.

RIGEL, ÖGLE, and Gemini are trademarks of Gemini Composites S.L. SRAM, Red, Force, Rival, AXS, XPLR, Eagle, and Transmission are trademarks of SRAM LLC. State Bicycle Co. is not affiliated with or endorsed by SRAM LLC. Specifications subject to change without notice.