6-bolt
The 6-bolt rotor mount fixes the rotor to the hub with six M5 bolts with Torx T25 heads, arranged on a 44 mm bolt circle (BCD). It's the most universal standard: used by Shimano, SRAM, Tektro, TRP and nearly everyone. They're tightened in a star pattern (1-4-2-5-3-6), never in a circle, to avoid warping the rotor. Torque is 2–4 N·m on Shimano (with the plate) or 6.2 N·m on SRAM.
It's the time-honored rotor mount: six bolts and a Torx key. Universal, reliable and easy to service in any shop in the world.
What it is and how to torque it right
Six M5 Torx T25 bolts hold the rotor on the hub flange (44 mm BCD). The key is to tighten them in a star —1-4-2-5-3-6, crossed— and not in circular order, to spread the tension and stop the rotor warping. Medium threadlocker (blue Loctite) is recommended because heat and vibration tend to loosen them.
Key data
What it fits
It fits any hub with 6 holes (ISO standard). You can mount a 6-bolt rotor on a Center Lock hub using an adapter, but a Center Lock rotor can never be modified to fit a 6-bolt hub.
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Frequently asked questions
In what order do I tighten the 6 bolts?
In a star, crossed: 1-4-2-5-3-6, in several passes to the final torque. Never in circular order, or the rotor warps.
What torque do I use?
2–4 N·m on Shimano (with the safety plate) or 6.2 N·m on SRAM. Use medium threadlocker so they don't back out.
Can I put a 6-bolt rotor on a Center Lock hub?
Yes, with a Center Lock-to-6-bolt adapter. Not the reverse: a Center Lock rotor won't fit a 6-hole hub.