CeramicSpeed OSPW RS Alpha Disc oversized pulley wheels kit for Shimano 9250/8150

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Regular price £439.99
Regular price £519.99 Sale price £439.99
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  • EU & International Customers: VAT & duties may apply on delivery. No hidden charges from us.
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Unleash RealWorld Speed Gains with CeramicSpeed OSPW RS Alpha Disc

For cyclists who demand uncompromising performance from every pedal stroke, the CeramicSpeed OSPW RS Alpha Disc is a raceengineered upgrade designed to transform your drivetrain’s efficiency and aerodynamic profile. Built specifically for Shimano 9250/8150 Di2 12speed disc brake derailleurs, this oversized pulley system delivers a tangible edge whether you're chasing marginal gains on time trial courses or seeking smoother, faster rides across rolling UK roads.

Developed in partnership with elite athletes and trusted by WorldTour pros, the RS Alpha Disc features 15T upper and 19T lower pulley wheels mounted within a robust, carbonreinforced polyamide cage. The aerodynamic carbon disc cover is shaped to reduce rear derailleur drag — an innovation born from wind tunnel testing and realworld racing feedback.

At its core are CeramicSpeed’s premium lowfriction bearings, enabling reduced drivetrain resistance and maximised power transfer. Every watt saved counts — and the RS Alpha Disc is precisionbuilt to deliver measurable performance improvements over standard pulley systems. 

Key Performance Features

Optimised for Shimano 9250/8150 Di2: Designed for 12speed disc brake systems with full electronic shifting.
15T/19T Oversized Pulley Wheels: Reduce chain articulation and drivetrain resistance under load.
Aerodynamic Carbon Disc Cover: Minimises drag at the derailleur cage for improved aero efficiency.
CeramicSpeed Bearings: Proven lowfriction technology trusted by pro cycling teams worldwide.
Lightweight CarbonReinforced Cage: Durable and stiff under torque, yet light for responsive handling.
 

Why Upgrade?

Every watt matters. Whether you're targeting podiums, segment PRs or simply elevating your ride quality, the RS Alpha Disc unlocks performance you can feel and measure. Its visual design complements the sleek lines of your Shimano Di2 setup, while the internal mechanics silently deliver enhanced responsiveness and efficiency.

Trusted by Pros. Available in the UK.

Now in stock at Eminence Cycle Co, UK riders benefit from genuine CeramicSpeed components, local customer support, and rapid shipping. As an authorised UK retailer, we ensure every RS Alpha Disc arrives fully packaged, performanceready, and supported with expert advice.

Ready to ride faster?
Unlock More Speed Today, Wherever You Are in the UK

Compare with Standard Pulleys – See the difference in drivetrain drag.
View Technical Specifications – Full details on materials, weights and compatibility.
Ask an Expert – Chat with our UK-based support team for personalised advice.
Shipping information

🇪🇺 EU & International Customers: VAT & duties may apply on delivery. No hidden charges from us.

Shipping policy

Shipping Overview

At Eminence Cycle Co., we are committed to providing fast and reliable shipping for all our products. All orders are shipped from the United Kingdom and are subject to the following shipping policies.


Processing & Dispatch Times

 Components, Accessories & Framesets: Dispatched within 5 working days.

 Complete Bikes (Pre-Owned & New): Dispatch may take up to 14 working days to ensure proper assembly and quality checks.


International Shipping & Customs

 Orders shipped outside the UK may be subject to import duties and taxes, which vary by country. These charges are the responsibility of the buyer.

 Eminence Cycle Co. will not be liable for delays or returns due to customs clearance.

 If an item is returned due to customs refusal, a reshipping fee will be applied and sent to the customer prior to resending the item.


Damaged Shipments & Claims

 If a package arrives damaged, it must be reported immediately in writing to jmcyclesltd@gmail.com upon receipt with clear photos and a damage report to initiate a claim.

 Eminence Cycle Co. reserves the right to refuse claims if damages are not reported immediately upon receipt.


For any shipping-related inquiries, please contact our support team before placing your order.


Thank you for choosing Eminence Cycle Co.!

 

Returns

We have a 14-day return policy, which means you have 14 days after receiving your item to request a return. 

To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase. 

To start a return, you can contact us at jmcyclesltd@gmail.com. 

If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

You can always contact us for any return question at jmcycles@gmail.com


Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.


Exceptions / non-returnable items
Certain types of items cannot be returned, like special orders—including custom-built bicycles, non-stock components, and any items specifically ordered at a customer’s request—are non-refundable and non-returnable unless deemed faulty or defective upon arrival.

By placing a special order, you acknowledge and agree that:

 No cancellations, refunds, or exchanges will be accepted once the order has been confirmed and processed.

 Special order items are procured specifically for you and cannot be resold as standard inventory.

 If a special order item arrives damaged or defective, you must notify us immediately, providing clear photographic evidence. We will work with the manufacturer to determine an appropriate resolution, which may include repair or replacement at our discretion.

This policy does not affect your statutory rights under consumer law.

If you have any questions regarding special orders, please contact us before making a purchase.

We do not accept returns for Pre Owned Bicycles and personal care goods (such as beauty products). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item. 

Unfortunately, we cannot accept returns on sale items or gift cards.


Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.


European Union 14 day cooling off period
Notwithstanding the above, if the merchandise is being shipped into the European Union, you have the right to cancel or return your order within 14 days, for any reason and without a justification. As above, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.


Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at jmcyclesltd@gmail.com

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★★★★★

Very friendly and helpful service.

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They worked to get me what i needed went above and beyond

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Super nice components and service - would order again

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★★★★★

Great pricing, great range of high end bikes and parts, super fast shipping and customer service was fast and great. Will definitely order again

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