Specialized 1-1/8 Concave Top Cap Star Nut Kit Black OEM

Specialized 1-1/8" Concave Top Cap & Star Nut Kit

Factory OEM | Black Top Cap | Steel Bolt | S142500002

The Specialized Factory Replacement Concave Top Cap & Star Nut Kit is a genuine OEM headset preload assembly for bicycles using a standard 1-1/8" threadless fork steerer tube.

The kit includes a black concave top cap, star nut, and steel preload bolt, making it suitable for headset service, fork replacement, or replacing worn or missing original hardware.

Its standard 1-1/8" configuration also allows use with many compatible non-Specialized bicycles using the same threadless steerer system.

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

Key Features

• Genuine Specialized factory OEM replacement kit

• Standard 1-1/8" threadless steerer application

• Concave top cap design

• Black finish

• Includes star nut

• Includes steel preload bolt

• Used across a wide range of Specialized mountain, youth, and recreational bikes

• Specialized MPN S142500002

Kit Includes

• 1 × 1-1/8" Star Nut

• 1 × Concave Top Cap – Black

• 1 × Steel Top Cap / Preload Bolt

Specifications

OEM Compatibility

2026

• Riprock Comp 24

2024

• Chisel Hardtail Comp

• Chisel Hardtail

2023

• Riprock Expert 24

• Fuse Sport 27.5

• Fuse 27.5

• Fuse M4 29 Frameset

• Chisel Hardtail Frameset

• Chisel Hardtail Comp

• Chisel Hardtail

2022

• S-Works Epic – Speed of Light Collection

• Rockhopper Sport 29

• Rockhopper Sport 27.5

• Rockhopper Sport 26

• Rockhopper Outride 29

• Rockhopper Outride 27.5

• Rockhopper Outride 26

• Rockhopper Expert 29

• Rockhopper Expert 27.5

• Rockhopper Elite 29

• Rockhopper Elite 27.5

• Rockhopper Comp 27.5

• Rockhopper 29

• Rockhopper 27.5

• Rockhopper 26

• Riprock Expert 24

• Fuse Sport 27.5

• Fuse M4 Frameset

• Fuse Expert 29

• Fuse Comp 29

• Fuse 27.5

• Chisel Hardtail LTD Frameset

• Chisel Hardtail Frameset

• Chisel Hardtail Comp

• Chisel Hardtail

2021

• Rockhopper Comp 27.5

• Rockhopper Comp

• Rockhopper

• Fuse Expert 29

• Fuse Comp 29

• Fuse 27.5

• Chisel LTD Frameset

• Chisel Frameset

• Chisel Comp

• Chisel

2020

• Rockhopper Expert 2X

• Rockhopper Expert 1X

• Rockhopper Comp 2X

• Rockhopper Comp 1X

• Rockhopper

• Pitch Sport

• Pitch Expert 2X

• Pitch Expert 1X

• Pitch Comp 2X

• Pitch Comp 1X

• Pitch 27.5

• Fuse M4 Frameset

• Fuse Expert 29

• Fuse Comp 29

• Fuse 27.5

• Fatboy SE

• Fatboy

• Epic Comp EVO

• Epic Comp

• Chisel Comp

• Chisel

2019

• Women's Rockhopper Sport

• Women's Rockhopper Pro

• Women's Rockhopper Expert

• Women's Rockhopper Comp

• Women's Rockhopper

• Women's Pitch Sport

• Women's Pitch Expert

• Women's Pitch Comp

• Women's Pitch

• Women's Epic Comp Alloy

• S-Works Stumpjumper Carbon 27.5 – Warranty Frame

• Men's Stumpjumper Expert 29

• Men's Stumpjumper EVO Comp Alloy 27.5

• Men's Rockhopper Sport

• Men's Rockhopper Pro 1X

• Men's Rockhopper Pro

• Men's Rockhopper Expert

• Men's Rockhopper Comp

• Men's Rockhopper

• Men's Pitch Sport

• Men's Pitch Expert

• Men's Pitch Comp

• Men's Pitch

• Men's Epic Comp Alloy

• Fatboy SE

• Fatboy 24

• Fatboy 20

• Epic Comp EVO

2018

• Women's Rockhopper Sport

• Women's Rockhopper Pro

• Women's Rockhopper Expert

• Women's Rockhopper Comp

• Women's Rockhopper

• Women's Pitch Sport 27.5

• Women's Pitch Expert 27.5

• Women's Pitch Comp 27.5

• Women's Pitch 27.5

• Women's Epic Comp Alloy

• Women's Camber 27.5

• Ruze Expert

• Ruze Comp

• Ruze

• Men's S-Works Stumpjumper 29

• Men's Rockhopper Sport

• Men's Rockhopper Pro AUS

• Men's Rockhopper Pro

• Men's Rockhopper Expert AUS

• Men's Rockhopper Expert

• Men's Rockhopper Comp AUS

• Men's Rockhopper Comp

• Men's Rockhopper

• Men's Pitch Sport 27.5

• Men's Pitch Expert 27.5

• Men's Pitch Comp 27.5

• Men's Pitch 27.5

• Men's Epic Comp

• Men's Camber 29

• Men's Camber 27.5

• Fuse Sport 6Fattie / 29

• Fuse Expert 6Fattie / 29

• Fuse Comp 6Fattie / 29 AUS

• Fuse Comp 6Fattie / 29

• Fuse Carbon Frameset

• Fuse 6Fattie / 29 AUS

• Fuse 6Fattie / 29

• Fatboy 24

• Fatboy 20

• Fuse Comp Carbon 29 / 6Fattie – Warranty Frame

2017

• Women's Camber 650B

• Turbo Levo FSR Short Travel 29

• Ruze Expert

• Ruze Comp

• Ruze

• Rockhopper Sport 29

• Rockhopper Pro 29

• Rockhopper Expert 29

• Rockhopper Comp 29

• Rockhopper 29

• Pitch Sport 650B

• Pitch Comp 650B

• Pitch 650B

• P.3

• Jynx Sport 650B

• Jynx Comp 650B

• Jynx 650B

• Jett Sport 29

• Jett Pro 29

• Jett Comp 29

• Hellga Comp

• Hellga

• Fuse Sport 6Fattie

• Fuse Expert 6Fattie

• Fuse Comp 6Fattie

• Fuse Carbon Frameset

• Fuse 6Fattie

• Fatboy SE

• Fatboy Comp Carbon

• Fatboy 24

• Fatboy 20

• Fatboy

• Camber 650B

• Camber 29

• Boy's Hotrock 24 SL

2016

• Status Grom

• Rumor 650B

• Rumor 29

• Rockhopper Sport 29

• Rockhopper Expert 29

• Rockhopper Comp 29

• Rockhopper 29

• Pitch Sport 650B

• Pitch Expert 650B

• Pitch Comp 650B

• Pitch 650B

• P.3

• Jynx Sport 650B

• Jynx Expert 650B

• Jynx Elite 650B

• Jynx Comp 650B

• Jynx 650B

• Jett Sport 29

• Jett Expert 29

• Jett Comp 29

• Jett 29

• Hotrock 24 SL Boys

• Hellga Comp

• Hellga

• Fuse Expert 6Fattie

• Fuse Comp 6Fattie

• Fate Elite 29

• Fate Comp 29

• Fatboy Trail

• Fatboy SE

• Fatboy Pro

• Fatboy Comp Carbon

• Fatboy Comp

• Fatboy Carbon Frameset

• Fatboy 24

• Fatboy 20

• Fatboy

• Crave SL 29

• Crave Expert 29

• Crave Comp 29

• Crave 29

• Camber Grom

• Camber Comp 29

• Camber 650B

• Camber 29

2015

• Status II

• Status I

• Status Grom

• Status Frame

• Rumor 650B

• Rumor

• Rockhopper Sport 29

• Rockhopper Pro EVO 650B

• Rockhopper Pro EVO 29

• Rockhopper Expert EVO 650B

• Rockhopper Expert EVO 29

• Rockhopper Expert 29

• Rockhopper Comp 29

• Rockhopper 29

• Pitch Sport 650B

• Pitch Expert 650B

• Pitch Comp 650B

• Pitch 650B

• P.STREET 2

• P.3

• Jynx Sport 650B

• Jynx Expert 650B

• Jynx Comp 650B

• Jynx 650B

• Jett Sport

• Jett Pro

• Jett LTD

• Jett Expert

• Jett Comp

• Jett

• Hotrock 24 SL Boys

• Fatboy SL

• Fatboy SE

• Fatboy Pro

• Fatboy Frameset

• Fatboy Expert

• Fatboy 24

• Fatboy 20

• Fatboy

• Crave SL

• Crave Pro Frame

• Crave Pro

• Crave Expert

• Crave Comp

• Crave

• Camber Grom

• Camber Comp 29

• Camber 29

2014

• Status II

• Status I

• Status Frame

• Safire

• Rumor Expert

• Rumor Comp

• Rumor

• Rockhopper Pro EVO 29

• Rockhopper Pro EVO 26

• Rockhopper Comp 29

• Rockhopper Comp 26

• Rockhopper Comp

• Rockhopper 29

• Rockhopper 26

• P.STREET 2

• P.3

• P.26 AM

• Jett Expert 29

• Jett Comp 29

• Jett 29

• Fatboy Expert

• Fatboy

• Crave SL 29

• Crave Pro 29 Frame

• Crave Pro 29

• Crave Expert 29

• Crave Comp 29

• Crave 29

• Carve Pro 29

• Carve Comp 29

• Camber 29

2013

• Status II

• Status I

• Status Frame

• Rockhopper Pro 29

• Rockhopper Pro 26

• Rockhopper LTD 26

• Rockhopper Expert 29

• Rockhopper Expert 26

• Rockhopper Comp 29

• Rockhopper Comp 26

• Rockhopper 29

• Rockhopper 26

• P.STREET 2

• P.Fix

• P.3

• P.26 Pro

• P.26 AM

• Jett Expert

• Jett Comp 29

• Jett 29

• Carve – Ned Overend

• Carve SL 29

• Carve Pro Frame

• Carve Pro 29

• Carve Expert 29

• Carve Comp 29

• Camber 29

Compatibility Notes

• Designed for standard 1-1/8" threadless fork steerers.

• The broad OEM list spans numerous Specialized mountain, youth, recreational, and fat-bike platforms.

• Compatibility with other bicycle brands depends on use of a compatible 1-1/8" threadless steerer and headset preload system.

• The star nut should only be used where the fork manufacturer permits a star-nut installation.

• Do not assume compatibility with carbon steerers; carbon steerers typically require the appropriate compression plug specified by the fork manufacturer.

• Verify Specialized MPN S142500002 before ordering.

The Specialized Concave Top Cap & Star Nut Kit S142500002 provides a simple factory replacement solution for restoring headset preload hardware on compatible 1-1/8" threadless fork systems.

Stage 21 Bikes carries genuine Specialized factory replacement parts and hard-to-find headset, fork, and cockpit service components.