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CeramicSpeed OSPW RS Alpha Derailleur Pulley for Shimano Dura-Ace R9250/Ultegra R8150, black

Ceramicspeed OSPW RS Alpha for Shimano Dura-Ace R9250/Ultegra R8150 Derailleur Pulley (Black)

113491

Rs. 54,000.00
/
incl., of all taxes. Shipping calculated at checkout.

CeramicSpeed's top-tier oversized pulley system for the Dura-Ace R9250/Ultegra R8150 rider who wants the brand's best drivetrain efficiency upgrade, team-logo finish included.

Overview

The Alpha RS sits above the standard OSPW RS line as CeramicSpeed's higher-spec oversized pulley wheel system, built for Shimano's Dura-Ace R9250 and Ultegra R8150 12-speed Di2 groupsets. It carries CeramicSpeed's signature team-logo cage finish, the same cosmetic treatment used on their WorldTour-level componentry.

Inside, it runs 15-tooth guide and 19-tooth tension pulleys on hybrid ceramic bearings in a carbon cage, rated for cassettes up to 34 teeth across the full 12-speed Di2 range. The box includes a Dura-Ace R9250-specific derailleur spacer and CeramicSpeed's own pulley bearing oil for ongoing maintenance - details that place this at the premium end of the OSPW lineup rather than the entry point.

This is the pick for a rider who wants CeramicSpeed's flagship pulley system rather than its standard offering - someone for whom the Alpha's bearing quality and finish justify the step up from the 5-Spoke version.

Why You'll Like It

CeramicSpeed's flagship pulley tier
The Alpha sits above the standard OSPW RS range, with the brand's best hybrid ceramic bearings and a team-logo carbon cage finish.

Matched to Dura-Ace/Ultegra 12-speed Di2
Sized specifically for R9250 and R8150, including a dedicated Dura-Ace R9250 derailleur spacer included in the box.

Comes with bearing oil
CeramicSpeed includes their own pulley bearing oil in the box, so you're set up for ongoing maintenance from day one rather than sourcing it separately.

Wide gearing range covered
Rated up to a 34T cassette, so it suits both tighter road gearing and wider-range climbing setups on the same groupset.

Who Is It For?

This is for the serious racer or dedicated enthusiast already on Dura-Ace R9250 or Ultegra R8150 who wants CeramicSpeed's best pulley system rather than its mid-tier option - someone for whom marginal drivetrain gains and premium componentry both matter.

It makes the most sense for riders doing structured training, racing, or long weekend rides in India where drivetrain efficiency compounds over distance, rather than short commuter use where the gain is barely noticeable.

Good to Know

Use the included bearing oil on a regular maintenance schedule to keep the ceramic bearings running at their best - don't substitute a generic chain lube for pulley bearing servicing.

Fit the included Dura-Ace R9250 derailleur spacer as directed; skipping it can affect derailleur alignment on this specific groupset.

Have a mechanic check B-tension and limit screws after installation, as with any oversized pulley cage swap.

Technical Specifications
  • Material: Stainless steel and hybrid ceramic bearings, carbon cage
  • Bearings: Hybrid ceramic
  • Pulley Teeth: 15T (guide) / 19T (tension)
  • Weight: 102g
  • Cassette Teeth Max: 34T
  • Compatibility: Shimano Dura-Ace R9250 and Ultegra R8150 (12-speed Di2)
  • Speed: 12 Speed
  • In The Box: CeramicSpeed Alpha RS OSPW, Dura-Ace R9250 derailleur spacer, pulley bearing oil
Additional Information
  • Country of Origin: China
  • Imported By: Ensign Sports, 502, Hill Glade, Opp. HDFC Bank Pali Road, Bandra, Mumbai - 400050, Maharashtra, India.
  • Net Quantity: 1N
  • Customer Care Address: 291, 10 Main, 5 Block, Jayanagar, Bangalore - 560041. Ph: (080)47183232, Email: support@bumsonthesaddle.com
  • Commodity: Derailleur Pulley
Warranty

This is a genuine product and is covered by a 1-month warranty from the date of original purchase against manufacturing defects in materials and workmanship.


Exclusions
  • Misuse or Negligence: The warranty does not cover damages resulting from misuse, abuse, or negligent handling of the products, including but not limited to improper installation, disassembly, or modification.
  • Unauthorized Repairs or Alterations: Any attempt to repair or alterations by individuals or service providers not authorized by the manufacturer will void the warranty.
  • Natural Wear and Tear: Normal wear and tear, including cosmetic deterioration, scratches, dents and fading over time, are excluded from the warranty coverage.
  • Accidents or External Forces: Damages caused by accidents, improper packing, collisions, unauthorized tampering or exposure to extreme external forces (e.g., impacts, falls, or severe weather conditions) are not covered under this warranty.
  • Incompatible Use: The warranty does not extend to damages resulting from using the products in ways inconsistent with their intended purpose or specifications.
  • Failure to Follow Instructions: Damages arising from a failure to follow the product's operating instructions, guidelines, or recommended practices as outlined in the user manual are not covered.
  • Battery Exclusions: For products with rechargeable Lithium-ion batteries, the warranty may exclude battery degradation over time or failures caused by non-compliance with proper charging procedures.
  • Third-Party Accessories: Damages caused by the use of third-party accessories, components, or modifications not explicitly approved by the manufacturer are not covered.
  • Failure to Provide Proof of Purchase: Warranty claims may require proof of purchase, and failure to provide such documentation may result in the exclusion of the product from warranty coverage.
  • Exclusion for Water Damage: Any damage relating to damage caused by water because some products are water repellant but not Water Proof
  • Non-specified conditions: Not includes damaged caused to products by improper accessories or improper fittings or for use in non specified conditions
Terms & Conditions
  • The warranty is available only to the Original purchaser/buyer of products
  • Service must be performed by Brand or an authorized reseller.
  • Insurance, handling and transportation charges to Brand Distributor shall be borne by Customer.
  • For some products registration is required to extend the warranty. Failure to register voids extended warranty
  • The decision to replace or repair a product is influenced by the brand and various factors

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