Overfast
OVERFAST Carbon Thru Axles for Specialized SL9 – Ultralight Road Disc Axle | 950kgf Strength
OVERFAST Carbon Thru Axles for Specialized SL9 – Ultralight Road Disc Axle | 950kgf Strength
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29±1g | Patented Carbon–Alloy Bond | >950kgf Tensile Strength
Ultralight carbon thru-axles with aluminium thread and titanium insert, designed for modern disc brake road bikes.
✔ Significant weight reduction
✔ EN & UCI tested
✔ 2024 updated version
✔ Complimentary worldwide shipping
Overfast axles suitable for other bike brands, please click here.
For Specialized Tarmac SL8/SL7/Venge/Crux/Aethos: Click Here
Engineering Highlights
Patented Carbon-Alloy Interface
The critical load-bearing interface between the carbon shaft and aluminium threaded section uses a patented mechanical bonding structure. This prevents separation under torque and tensile loads. Overfast also uses aerospace-grade adhesives to bond the two for added peace of mind.
Titanium Insert
Titanium reinforcement for the hex wrench socket adds only 1g but significantly improves thread durability and long-term reliability.
Weight Savings
Saves ~100g compared to many stock thru-axles, depending on model.
Strength & Safety Testing
Each design passed both destructive and non-destructive testing, including:
- Fatigue test with wheelset (EN standards)
- Impact test with wheelset (UCI standards)
- Maximum torque test (19Nm)
- Tensile strength test (>950kgf)
- Lateral compression test (100–200kg)
- X-ray structural inspection
- Carbon cap impact & fatigue testing (20J impact, 12Nm repeated torque)
- 1+ year real-world athlete testing
- Threads are torqued to specification during QC inspection to ensure safety and fitment.
For a more detailed dive into the engineering, please see: 27g for a Pair: How OVERFAST Engineered the World's Lightest Thru-Axle
Assembly Information
- Do not use RSP assembly paste. It may cause thread seizure.
- Light marks on threads may be visible due to QC torque testing. Rest assured that all axles are brand new. This step is essential to guarantee the safety of the product.
- Ensure the head of the tool is inserted at least 15mm into the thru-axle before tightening/loosening.
- Use a torque wrench for installation. Recommended Torque: 7-9Nm
- Tighten by hand initially to ensure the thread between the thru-axle and frame is aligned to prevent stripped threads.
- Overfast uses a tighter thread tolerance, so please expect a tigher fit during assembly compared to stock axles.
Warranty Information
Warranty Information
Warranty Coverage
All Overfast products are covered by a 2-year warranty against manufacturing defects. This warranty does not cover damage caused by misuse, accidents, crashes, improper installation, modification, or normal wear and tear.
Warranty Claims
To process a warranty claim, customers must provide clear photos and/or videos showing the issue. Once the claim has been reviewed and confirmed by Overfast, replacement parts will be arranged as quickly as possible.
Thru-Axles
For defective thru axles, please provide clear photos or videos of the affected product. Once the defect has been verified, a replacement will be shipped promptly.
Cranksets
If a crank arm suffers a confirmed manufacturing defect (non-user-related), please provide detailed photos and a description of the issue.
After approval:
- The defective crank arm must be permanently destroyed (for example, by drilling a hole through it).
- Evidence of destruction must be submitted.
- If only one crank arm is defective, only the affected side will be replaced.
Once the above requirements are met, the replacement will be arranged immediately.
Wheelsets
Warranty service for wheelsets depends on the specific component that has failed. After inspection, Overfast will provide the appropriate replacement part or component based on the confirmed issue.
Other Products
The same warranty process applies to all other Overfast products. As long as sufficient evidence is provided to verify a manufacturing defect, warranty claims will be prioritised and processed promptly.
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Crash Replacement Programme
For products damaged due to crashes, accidents, or other user-related incidents, Overfast offers a Crash Replacement Programme.
Eligible customers may purchase a replacement product at 30% off the recommended retail price (70% of MSRP).
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Notes
- All warranty claims are subject to inspection and approval by Overfast.
- Clear photos, videos, and any other requested documentation may be required before a claim can be approved.
- Overfast reserves the right to determine whether a claim qualifies under the warranty or the Crash Replacement Programme.
Returns & Refund Information
Returns & Refund Information
Queremos que esté completamente satisfecho con su compra. Sin embargo, tenga en cuenta que solo se aceptan devoluciones y reembolsos por problemas de calidad del producto , como grietas o roturas estructurales .
Problemas como crujidos o ruidos suelen ser el resultado de una instalación incorrecta y no se consideran defectos del producto .
No se admiten devoluciones ni reembolsos.
No se aceptarán devoluciones bajo las siguientes condiciones:
- Instalación o uso incorrectos
- Desgaste normal, marcas superficiales o imperfecciones cosméticas
- Daños causados por mal uso, exceso de torque o accidentes
- Cualquier modificación o alteración del producto
- Productos que muestran signos de uso (incluidas marcas de abrazaderas o de instalación).
Devoluciones por pedido de modelo incorrecto
Si usted solicitó el modelo incorrecto:
- Usted es responsable de todos los gastos de envío de la devolución.
- Una vez que hayamos recibido su devolución, le reembolsaremos el importe de la compra menos:
- a) Comisión de la pasarela de pago del 7% (esto es lo que nos cobra nuestra compañía de tarjetas de crédito).
- b) Los gastos de envío, incluso si recibió "envío gratuito", ya que nosotros subsidiamos el envío a nuestro propio costo.
Notas adicionales
- Los artículos devueltos deben estar sin usar, en su estado original y completos con todo su embalaje .
- Los productos que presenten cualquier signo de instalación o uso no podrán devolverse.
- Si fuera necesario un nuevo envío, los gastos de reenvío correrán a cargo del comprador .
