anyone know the torque spec for this?

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addictR1
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by addictR1

when trying to install my rotor QXL rings to my force22 crankarms, i had to remove these screws to gain access to torque down the 5th hidden bolt behind the drive-side crankarm.

currently i torqued it down to 10nm + blue loctite, but not sure if anyone knows the specific torque spec for these circled in red?

thanks.
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pdlpsher1
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by pdlpsher1

The proper way to install this ring is to get the special pressed-in nut for the hidden bolt. This way the hidden bolt can be installed without detaching the crank spider. Perhaps you could contact SRAM for the proper torque value.


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pdlpsher1
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by pdlpsher1

I recall now that you got a different bolt set on Amazon. I guess your method works but eventually you'll run into the same problem every time you change the ring.


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addictR1
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by addictR1

pdlpsher1: yup, i didn't get a press-in nut for the hidden bolt. contacted sram and just got the run around.


addictR1
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by addictR1

Thanks kkibbler. Guess 10nm is a bit much then....

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wheelsONfire
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by wheelsONfire

I think Rotors spec is 7Nm.
Run 6Nm and use Loctite small (just one drop) one each bolt.
Do not soak them!!

http://www.amazon.com/Loctite-38653-Pur ... B0002KKTT0

I used this at my Buell motorcycle and it hinders bolts from coming off.
This motocycle use an old HD Evo Sportster engine.
This vibrates A-L-O-T so if Loctite 222 is sufficent for these bolts, they for sure will remain seated on a bike!

It also brakes the (Loctite) bond at 6-8Nm.
This is the only Loctite you should use at bolts for cycling.
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Valbrona
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by Valbrona

pdlpsher1 wrote:The proper way to install this ring is to get the special pressed-in nut for the hidden bolt.


Go on then ... where do you get them from?

2lo8
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by 2lo8

In general, if it's not something that's clamping onto something that can break, like a stem or a seat clamp does, you can usually just go by engineering spec sheets for a given thread size, as things will generally be engineered to standard engineering specifications.
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pdlpsher1
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by pdlpsher1

Valbrona wrote:
pdlpsher1 wrote:The proper way to install this ring is to get the special pressed-in nut for the hidden bolt.


Go on then ... where do you get them from?


I got mine from Quarq. And SRAM owns Quarq. I don't own a Force crank but I assume every Force crank with stock chainring comes with one? So if you buy a Force replacement chainring it should come with one. And SRAM should be able to supply the part individually.


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HakeemT
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by HakeemT

FWIW, when I swapped cranks on my Quarq PM, SRAM told me to use Loctite 638 (I ended up using 680) and torque those 3 bolts to 10nm.

addictR1
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by addictR1

Ok finally got an official email back from SRAM

Torque spec for spider bolts is 8.9Nm.

Regards,
SRAM USA
www.sram.com

Service and Technical Documents:
www.sram.com/service

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pdlpsher1
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by pdlpsher1

8.9Nm? I hope that's not a joke. Why not just round to 9Nm :-)


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addictR1
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by addictR1

pdlpsher1 wrote:8.9Nm? I hope that's not a joke. Why not just round to 9Nm :-)
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lol.. i know huh? i just took that as a typo... when they meant 8, 9nm.

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BRM
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by BRM

Nm is the max force you can use before a bolt breaks
Mostimes the given torque is the MAXIMUM
Normally the given max torque is for dry bolts
When using a form of lube the used torque needs to decrease (Lubrication factor)

Probably 5-6 Nm would be more than enough
Steel bolts can bare more Nm than alu bolts

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