Centerlock Cap Titanium Outer 5.5 g or Inner 4.6 g — Pick One Based on Your Rotor Type

TiNEtech

Jul 30, 2026

Centerlock Caps Titanium: TiNE Outer 5.5 g or Inner 4.6 g — Pick One for Your Hub

Centerlock disc brake hubs require one cap — but which one depends on your rotor type. TiNE makes both in Grade 5 Ti-6Al-4V: the outer cap at 5.5 g for riders running six-bolt rotors on centerlock hubs, and the inner cap at 4.6 g for riders running native centerlock rotors. You pick one — not both. They are not interchangeable.

Outer Cap — 5.5 g Six-Bolt to Centerlock Adapter

Use when: you have a six-bolt disc rotor but a centerlock hub body

Also works as direct centerlock cap for centerlock rotors

5.5 g

Inner Cap — 4.6 g Centerlock Rotor Lockring

Use when: you have a native centerlock disc rotor

Not compatible with large-axle hubs

4.6 g

Your Setup	Which Cap	TiNE Weight	What It Does
Six-bolt rotor + Centerlock hub	Outer cap	5.5 g	Converts six-bolt to centerlock mount
Centerlock rotor + Centerlock hub	Inner cap	4.6 g	Locks centerlock rotor to hub spline

Important: The outer cap and inner cap are not used together. They serve entirely different functions based on your rotor type. You buy one — the one that matches your disc rotor mounting standard. Mixing them on the same hub is impossible by design: the outer cap covers the six-bolt mounting surface, while the inner cap threads directly into the centerlock spline.

Frequently Asked Questions

Question	Answer
Can I use both caps on one wheel?	No. Each wheel needs exactly one cap. The outer cap is for six-bolt rotors, the inner cap is for centerlock rotors. They occupy the same mounting position and cannot stack. Pick the one that matches your rotor.
What if I swap rotors between bikes?	If you switch between six-bolt and centerlock rotors on the same hub, you would need to swap the cap as well — outer for six-bolt days, inner for centerlock days. Most riders pick one rotor type and stick with it.
Is the inner cap compatible with all centerlock hubs?	No. The inner cap is not compatible with large-axle hubs (some power meter hubs use oversized through-axle diameters that exceed the cap's inner bore). For standard centerlock hubs — Shimano, DT Swiss, most road hubs — it fits cleanly.
Does the outer cap work as a direct centerlock cap too?	Yes. The outer cap doubles as a direct centerlock cap — it can secure a centerlock rotor without the adapter function. But it weighs 0.9 g more than the dedicated inner cap (5.5 g vs 4.6 g), so riders with centerlock rotors typically choose the inner cap for the lighter option.
Why titanium for centerlock caps?	Grade 5 Ti-6Al-4V has a far lower thermal expansion coefficient than aluminum (~8.6 vs ~23 × 10⁻⁶/°C). Disc hubs generate significant heat on long descents — aluminum caps can loosen under thermal cycling, while titanium maintains clamping force more consistently.

Why the 0.9 g difference matters. The outer cap (5.5 g) carries an adapter sleeve that bridges six-bolt rotor holes to the centerlock spline. That sleeve adds structural material — and 0.9 g of weight. If you ride centerlock rotors exclusively, the inner cap (4.6 g) is the lighter and simpler choice. If you need the six-bolt adapter function, the outer cap covers both scenarios at a modest weight premium.

Property	Aluminum Cap	TiNE Grade 5 Ti-6Al-4V
Thermal expansion	~23 × 10⁻⁶/°C (loosens under heat)	~8.6 × 10⁻⁶/°C (stable clamp)
Yield strength	~275 MPa (6061-T6)	~880 MPa
Construction	Two-piece (cap + lockring)	CNC one-piece

CNC one-piece Grade 5 Ti-6Al-4V, 8 anodized colors (gold, blue, rainbow, silver, black, pink, green, multi). Outer cap: 5.5 g, six-bolt adapter + centerlock compatible. Inner cap: 4.6 g, centerlock rotor lockring (not for large-axle hubs). Pick one based on your rotor — they are not used together.

TiNE Centerlock Cap Titanium — Pick One for Your Hub
tinetech.com
Outer 5.5 g (Six-Bolt Adapter) or Inner 4.6 g (Centerlock Lockring) · Grade 5 Ti-6Al-4V · CNC One-Piece · 8 Colors · Not Used Together