Specialized Roval Alpinist Lightweight Saddle Rail Clamp Kit OEM

Specialized Roval Alpinist Lightweight Saddle Rail Clamp Kit

Factory OEM | Upper & Lower Clamps | S254900002

The Specialized Factory Replacement Lightweight Saddle Rail Clamp Kit is an extra-light OEM clamp set designed for compatible Roval Alpinist, Tarmac SL8, and related Specialized seatposts.

These lightweight clamps are precision-machined to remove excess material while retaining the required saddle-supporting structure. They are cross-compatible with the standard saddle rail clamps used on Roval Alpinist and Tarmac SL8 seatposts, making them an ideal factory upgrade for riders looking to reduce weight while maintaining genuine Specialized fit and compatibility.

The kit includes one upper saddle rail clamp and one lower saddle rail clamp. Mounting hardware is not included.

Available from Stage 21 Bikes, your trusted source for hard-to-find Specialized OEM replacement parts.

Key Features

• Genuine Specialized factory replacement component
• Lightweight saddle rail clamp design
• Precision-machined to remove excess material
• Direct lightweight upgrade for compatible standard clamps
• Cross-compatible with standard Roval Alpinist saddle rail clamps
• Cross-compatible with Tarmac SL8 seatpost saddle rail clamps
• Includes upper and lower saddle clamps
• Genuine OEM fit and finish

Specifications

Kit Includes

• 1 × Upper Saddle Rail Clamp
• 1 × Lower Saddle Rail Clamp

Mounting hardware is not included.

When upgrading an existing Roval Alpinist or Tarmac SL8 seatpost, reuse your existing mounting hardware.

If replacement hardware is also required, it is supplied as part of the standard Roval Alpinist Saddle Rail Clamp & Hardware Kit – S204900004.

Compatibility

These lightweight clamps are cross-compatible with the standard saddle rail clamps used on Roval Alpinist and Tarmac SL8 seatposts.

They are also factory-equipped on select newer Specialized and Roval applications listed below.

OEM Compatibility

2027

• Tarmac SL9 S-Level – Shimano Dura-Ace Di2
• Tarmac SL9 S-Level – SRAM RED AXS
• Tarmac SL9 Frameset – FACT 10r Carbon
• Tarmac SL9 Expert – Shimano Ultegra Di2
• Tarmac SL9 Expert – SRAM Force AXS
• Tarmac SL9 Comp – Shimano 105 Di2
• Tarmac SL9 Comp – SRAM Rival AXS
• Tarmac SL9 Warranty Frame
• S-Works Tarmac SL9 Team Replica Frameset – Soudal Quick-Step
• S-Works Tarmac SL9 Team Replica Frameset – SD Worx – Protime
• S-Works Tarmac SL9 Team Replica Frameset – Red Bull – BORA – hansgrohe
• S-Works Tarmac SL9 Team Replica Frameset – FDJ United – SUEZ
• S-Works Tarmac SL9 Frameset – FACT 12r Carbon
• S-Works Tarmac SL9 Warranty Frame
• S-Works Tarmac SL9 – SRAM RED AXS
• S-Works Rapide Post
• S-Works Crux 5 – SRAM RED XPLR
• S-Works Aethos 2 – SRAM RED AXS
• S-Works Aethos 2 Warranty Frame
• Roval Alpinist Seatpost
• Crux 5 Sport – Shimano GRX 800
• Crux 5 S-Level – SRAM RED XPLR
• Crux 5 Expert – SRAM Force XPLR
• Aethos 2 Pro Warranty Frame
• Aethos 2 Pro – SRAM Force AXS
• Aethos 2 Expert – Shimano Ultegra Di2
• Aethos 2 Expert – SRAM Force AXS

2026

• S-Works Aethos 2 LTD – Year of the Horse
• S-Works Aethos 2 Frameset – FACT 12r Carbon
• S-Works Aethos 2 – Shimano Dura-Ace Di2
• S-Works Aethos 2 – SRAM RED AXS
• S-Works Aethos 2 Warranty Frame
• Aethos 2 Pro Warranty Frame
• Aethos 2 Pro – Shimano Ultegra Di2
• Aethos 2 Pro – SRAM Force AXS
• Aethos 2 Frameset – FACT 10r Carbon
• Aethos 2 Expert – Shimano Ultegra Di2
• Aethos 2 Expert – SRAM Force AXS

Compatibility Notes

• S254900002 contains the lightweight upper and lower saddle rail clamps only.
• Mounting bolts and other hardware are not included.
• Reuse the existing hardware when upgrading a compatible Roval Alpinist or Tarmac SL8 seatpost.
• If new mounting hardware is required, use the standard Alpinist Saddle Rail Clamp & Hardware Kit, MPN S204900004.
• Verify your seatpost and saddle rail configuration before ordering.

Lightweight OEM Upgrade

Unlike the standard Roval Alpinist clamps, these factory lightweight versions are machined to remove unnecessary material, reducing weight while maintaining the correct Specialized/Roval saddle clamp interface.

Because they are cross-compatible with the standard clamp system, S254900002 provides a straightforward OEM weight-saving upgrade for compatible Roval Alpinist and Tarmac SL8 seatposts without requiring replacement of the complete seatpost assembly.