Centerlock vs 6-Bolt Adapter Guide

Centerlock and 6-bolt are the two disc rotor mounting standards on modern bikes. If your hub is one type and your rotor is the other, you need an adapter — or a smarter approach.

What Is Centerlock?

Centerlock is Shimano's rotor mounting system. A splined interface on the hub accepts the rotor, and a lock ring (threaded with a cassette tool) secures it. Installation and removal are fast — one ring instead of six bolts. Most Shimano and DT Swiss hubs use Centerlock.

What Is 6-Bolt?

The 6-bolt standard uses six M5 threaded holes on the hub flange. Rotors attach with six small bolts, typically Torx T25. It is universal across many brands and offers easy field replacement — if you carry a Torx key, you can swap a rotor trail-side.

Do I Need a Centerlock-to-6-Bolt Adapter?

Yes — if you have a Centerlock hub but want to run a 6-bolt rotor. Adapters like the Shimano SM-RTAD05 slide onto the Centerlock spline and provide a 6-bolt mounting surface. They add roughly 20–25 g per wheel. Going the other direction (6-bolt hub, Centerlock rotor) is not possible with a simple adapter.

Can I Save Weight at the Centerlock?

Yes. The stock Centerlock lock ring is steel and relatively heavy. TiNE offers titanium Centerlock lock rings in two configurations: the outer lock ring at 5.5 g and the inner cap at 4.6 g. Both are CNC-machined from Grade 5 Ti-6Al-4V, available in eight anodized colors, and compatible with Shimano Centerlock hubs — a direct weight reduction with no adapter needed.

Titanium Centerlock lock rings at tinetech.com