Disc brake rotor bolts - torque

[Dwn]

I'm just about to change the wheels on my triban rc520 and wondered if anyone knows the torque settings for the rotor bolts?

 

[Jody]

Not much from memory. Think they are around 6nm.

 

[smokeysmoo]

Shimano states 2-4Nm for a 6 bolt rotor HERE, but you don't state what make yours are, the manufacturer will have the info if it's not Shimano.

Also maybe check the recommendation of re-fitting old bolts, (if you are of course), I don't know but it just crossed my mind.

FWIW I changed a rotor a few weeks ago, never thought about torque TBH, tightened it up and it's not fell off, happy days

 

[Dwn]

Didn't think to check the manufacturer, but it's TRP - thanks for prompting that check. It seems recommended torque is 6 - 8 Nm.

 

[smokeysmoo]

I concur, TRP are indeed quoting 6-8Nm, for their SPYRE brakes at least

 

[DRM]

Don't forget to rotate the disc clockwise against the fixing bolts before you torque them up

 

[Slick]

Don't forget to rotate the disc clockwise against the fixing bolts before you torque them up

Why do you need to do that?

 

[DRM]

so that when you brake the edge of the holes are against the bolt, there is less shearing force against the bolts, see the video below at 4:58

View: https://youtu.be/SE9DJKXmIy8

 

[Low Gear Guy]

The last time I tightened up the bolts the recommended torque was marked by etching on the rotor.

 

[Slick]

so that when you brake the edge of the holes are against the bolt, there is less shearing force against the bolts, see the video below at 4:58

View: https://youtu.be/SE9DJKXmIy8

Didn't know that was a thing but it does make sense although I'm not sure it would work on my rotors as the bolts are paired with a washer that dictates the actual final position.

 

[Tom B]

Also maybe check the recommendation of re-fitting old bolts, (if you are of course), I don't know but it just crossed my mind.

6-8Nm for mine and a blob of thread lock. Never had them come loose.

They say don't not reuse them, but I always have and just replace them when the heads start to go a bit mushy.

 

[DRM]

Didn't know that was a thing but it does make sense although I'm not sure it would work on my rotors as the bolts are paired with a washer that dictates the actual final position.

The washers shouldn’t prevent being able to set the disc as described, unless they are dished and centre themselves in to the holes on the disc rotor.

 

[Dwn]

Don't forget to rotate the disc clockwise against the fixing bolts before you torque them up

Wouldn't have thought of that - thanks for the tip

 

[smokeysmoo]

6-8Nm for mine and a blob of thread lock. Never had them come loose.

Never thought of that TBH. I've only changed one rotor and I fitted a new one so it came with new bolts, but if I ever need to do a wheel change I'll bear thread lock in mind, good shout

 

[DRM]

Never thought of that TBH. I've only changed one rotor and I fitted a new one so it came with new bolts, but if I ever need to do a wheel change I'll bear thread lock in mind, good shout

it's worth doing, but they really should come with thread lock already applied to the threads.