CeramicSpeed OSPW RS Alpha Shimano Dura-Ace 9250/Ultegra 8150

$699⁰⁰

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Color

Black Silver

The CeramicSpeed OSPW RS Alpha Shimano Dura-Ace 9250/Ultegra 8150 typically ships in 5-8 business days

CeramicSpeed | SKU: 113490 | Option: Black

This product is HSA / FSA eligible

Pickup available at RA Cycles - Brooklyn

Normalmente pronto em 24 horas

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CeramicSpeed OSPW RS Alpha Shimano Dura-Ace 9250/Ultegra 8150 Info

The CeramicSpeed OSPW RS Alpha Shimano Dura-Ace 9250/Ultegra 8150 replaces the stock pulley cage on Shimano's latest Di2 derailleurs with a reinforced aluminum cage and a pair of solid Alpha disc pulleys. The two-piece disc design eliminates the open spoke gaps you'd find on a standard pulley wheel, which does double duty here — it protects the bearing underneath and gives the wheel a cleaner, more finished look against a modern Di2 groupset.

That bearing protection comes from CeramicSpeed's patented ADR technology: a dust cover anchored into a groove on the pulley wheel that fully encloses the bearing, paired with a bladed groove structure that actively flings debris out as the wheel spins. It's a meaningfully different approach from a standard open pulley, where road grit and water have a direct path to the bearing. The composite tooth profile on the Alpha disc adds a bit of noise reduction and wear resistance on top of that, and CeramicSpeed backs the whole system with a lifetime warranty.

At 102 grams and built specifically for the Shimano Dura-Ace RD-9250 and Ultegra RD-8150 derailleurs, this is a direct-fit upgrade rather than a universal one — it's designed for riders running Shimano's current 12-speed Di2 groupsets, not older mechanical or previous-generation electronic setups. It's available in black, which typically ships right away, or silver, which usually takes a week or two longer to get in hand.

At $699, the RS Alpha sits well below CeramicSpeed's titanium and aero flagship pulleys, making it the more accessible entry point into their oversized pulley lineup for Shimano riders. It's aimed at riders who want the durability benefits of sealed, protected bearings and a reinforced cage without paying for the aero shroud or 3D-printed titanium construction found higher up the range.

The RA Perspective

Of the CeramicSpeed pulley systems we carry for the current Shimano Di2 groupsets, this is the one we point most riders toward first. It's not chasing the aero gains or gram-counting of the pricier options — it's a durability upgrade with a real, sensible mechanism behind it.

The ADR bearing protection is the feature that actually matters day to day. Standard pulley wheels leave the bearing exposed at the spoke gaps, and that's usually where grit and water work their way in over a wet winter of riding. The sealed, self-clearing design here is a genuine improvement, not just a marketing bullet point.

The tradeoff compared to the aero or titanium versions is straightforward: no aerodynamic shroud, and aluminum construction instead of titanium, so it's a bit heavier than the top-tier options. For most road riders that difference is irrelevant. The lifetime warranty also takes some of the sting out of the price for anyone hesitant about spending this much on pulley wheels in the first place.

We'd recommend this to a rider who wants a meaningful upgrade over stock Shimano pulleys and values durability over squeezing out the last watt of aero savings.