CeramicSpeed OSPW RS Alpha Shimano 105 7150

$699⁰⁰

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Color

Black Silver

The CeramicSpeed OSPW RS Alpha Shimano 105 7150 typically ships in 5-8 business days

CeramicSpeed | SKU: 113496 | Option: Black

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CeramicSpeed OSPW RS Alpha Shimano 105 7150 Info

The CeramicSpeed OSPW RS Alpha Shimano 105 7150 is CeramicSpeed's oversized pulley wheel system built specifically for Shimano's 105 Di2 electronic groupset. It replaces the stock rear derailleur cage and pulleys with a larger-diameter system designed to reduce chain articulation and friction through the drivetrain, while giving the rear derailleur a more contemporary, angular look that matches current bike and groupset design trends.

This version uses CeramicSpeed's ALPHA Disc pulley wheels, a two-piece design that pairs a narrow-wide tooth profile — molded in a composite material for wear resistance and quieter running — with a solid aluminum disc. That solid disc closes off the gaps between spokes found on a traditional pulley wheel, keeping debris, mud, and small objects from working into the mechanism, while adding stiffness to the wheel itself. It's paired with CeramicSpeed's patented ADR technology, which anchors a dust cover in a groove around the bearing and surrounds it with a bladed groove structure that flings debris away as the pulley spins. CeramicSpeed calls this combination of ADR protection, the Alpha Disc pulleys, and a reinforced cage its Further Drive Technology, and the brand has field-tested the approach with sponsored cyclocross teams to prove out mud clearance in genuinely bad conditions.

Beyond debris protection, the OSPW RS cage has been reinforced compared to earlier CeramicSpeed pulley systems, adding strength and durability without changing the core oversized-pulley concept the OSPW line is built around. It also includes customizable spring tension, so you can fine-tune cage preload and shifting feel to match your specific 105 Di2 setup rather than running one fixed setting.

The premise behind any OSPW system is that larger pulley wheels reduce how sharply the chain has to bend as it wraps around them, which lowers friction through the drivetrain and lets more of your power reach the rear wheel. CeramicSpeed doesn't publish a specific wattage figure for this model, so the honest way to frame it is a friction-reduction upgrade rather than a guaranteed number of watts saved.

At $699.00, this is an upgrade for riders who already understand what an OSPW system does and want it paired with 105 Di2 specifically — it's not a component most riders reach for on a whim. It suits cyclists chasing marginal drivetrain efficiency and a cleaner, more integrated look at the rear derailleur, particularly those riding in conditions where the ALPHA Disc and ADR debris protection will actually get used.

The RA Perspective

Customers ask us the same question every time this comes up: does it really make a difference, or does it just look cool? Our honest answer is both. The oversized pulleys measurably reduce how much the chain has to bend as it wraps around the cage, and less chain articulation means less friction — but CeramicSpeed doesn't publish a wattage figure for this specific model, so we won't invent one either.

Where this version earns its price over a basic OSPW cage is the Alpha Disc and ADR debris protection. If you ride in wet, muddy, or gritty conditions, a solid pulley disc that keeps debris out of the mechanism is a real functional upgrade, not just aesthetics. If you mostly ride clean roads in dry weather, you're paying largely for the reinforced cage and the look.

We'd point this at 105 Di2 riders who want their rear derailleur to look as dialed-in as the rest of their build, and who ride enough varied conditions to get real use out of the debris protection — not just clean-weather crit racers chasing a number on a dyno chart.