Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3)

Apr 20, 20 7:15

Post #1 of 17 (2394 views)

Hi guys,

I bought a Cervelo P3 frameset (2018), and I am building it with (Mechanical) Ultegra group set.
According to Shimano, the torque for installing the rear derailleur is 8 -10 Nm.
From my previous experience with other frames, I usually grease the threads of the derailleur before installing it.
However it is not feasible with carbon derailleur hanger.

Can you please advice me what is the best approach:
Should I install the rear derailleur dry?
Or is it better to use carbon assembly paste? It yes, what should be the "new" torque?

Thanks a lot for in advance for your comments!

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [Dror Sever] [ In reply to ]

Apr 20, 20 7:21

Post #2 of 17 (2386 views)

Why do you think that the rear derailleur hanger is made of carbon?

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [Dror Sever] [ In reply to ]

Apr 20, 20 7:23

Post #3 of 17 (2384 views)

Dror Sever wrote:

Hi guys,

I bought a Cervelo P3 frameset (2018), and I am building it with (Mechanical) Ultegra group set.
According to Shimano, the torque for installing the rear derailleur is 8 -10 Nm.
From my previous experience with other frames, I usually grease the threads of the derailleur before installing it.
However it is not feasible with carbon derailleur hanger.

Can you please advice me what is the best approach:
Should I install the rear derailleur dry?
Or is it better to use carbon assembly paste? It yes, what should be the "new" torque?

Thanks a lot for in advance for your comments!

I'm pretty sure that it's an aluminum derailleur hanger, like nearly every other carbon frame I've ever seen.

Swimming Workout of the Day:

Favourite Swim Sets:

2020 National Masters Champion - M50-54 - 50m Butterfly

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [jimatbeyond] [ In reply to ]

Apr 20, 20 8:13

Post #4 of 17 (2362 views)

This is how Cervelo designed the P2 or P3 frames. Integrated Carbon rear derailleur hanger for increased stiffness.

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [JasoninHalifax] [ In reply to ]

Apr 20, 20 8:13

Post #5 of 17 (2361 views)

JasoninHalifax wrote:

Dror Sever wrote:

Hi guys,

I bought a Cervelo P3 frameset (2018), and I am building it with (Mechanical) Ultegra group set.
According to Shimano, the torque for installing the rear derailleur is 8 -10 Nm.
From my previous experience with other frames, I usually grease the threads of the derailleur before installing it.
However it is not feasible with carbon derailleur hanger.

Can you please advice me what is the best approach:
Should I install the rear derailleur dry?
Or is it better to use carbon assembly paste? It yes, what should be the "new" torque?

Thanks a lot for in advance for your comments!

I'm pretty sure that it's an aluminum derailleur hanger, like nearly every other carbon frame I've ever seen.

You need to get out more.

But seriously, my bike has a non-replaceable derailleur hanger. It is carbon with a metal threaded insert (2012 Felt B12). This isn't my bike but the same frame pic I found online (if you look at the threads of the derailleur hanger you can see it's metal).

To the OP, the hanger should have a metal threaded insert even if it isn't an aluminum/replaceable one so grease away the threads like you normally do. If it doesn't I'd be worried about if it was my frame.

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [loxx0050] [ In reply to ]

Apr 20, 20 10:18

Post #6 of 17 (2320 views)

https://ruckuscomp.com/...dropout-replacement-

As you can check in the above link. It is full carbon, including threads.

I think that maybe Park Tool PolyLube 1000 is my best option. Park tool specifically notes that it is safe to use with carbon.

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [Dror Sever] [ In reply to ]

Apr 20, 20 10:32

Post #7 of 17 (2300 views)

Dror Sever wrote:

https://ruckuscomp.com/...dropout-replacement-

As you can check in the above link. It is full carbon, including threads.

I think that maybe Park Tool PolyLube 1000 is my best option. Park tool specifically notes that it is safe to use with carbon.

that link is a company that replaces the stock dropout with a carbon one. you can clearly see in the images that the broken, stock dropout is made of aluminum.

Swimming Workout of the Day:

Favourite Swim Sets:

2020 National Masters Champion - M50-54 - 50m Butterfly

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [Dror Sever] [ In reply to ]

Apr 20, 20 10:33

Post #8 of 17 (2298 views)

It's clearly not carbon

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [loxx0050] [ In reply to ]

Apr 20, 20 10:42

Post #9 of 17 (2286 views)

loxx0050 wrote:

JasoninHalifax wrote:

Dror Sever wrote:

Hi guys,

I bought a Cervelo P3 frameset (2018), and I am building it with (Mechanical) Ultegra group set.
According to Shimano, the torque for installing the rear derailleur is 8 -10 Nm.
From my previous experience with other frames, I usually grease the threads of the derailleur before installing it.
However it is not feasible with carbon derailleur hanger.

Can you please advice me what is the best approach:
Should I install the rear derailleur dry?
Or is it better to use carbon assembly paste? It yes, what should be the "new" torque?

Thanks a lot for in advance for your comments!

I'm pretty sure that it's an aluminum derailleur hanger, like nearly every other carbon frame I've ever seen.

You need to get out more.

But seriously, my bike has a non-replaceable derailleur hanger. It is carbon with a metal threaded insert (2012 Felt B12). This isn't my bike but the same frame pic I found online (if you look at the threads of the derailleur hanger you can see it's metal).

To the OP, the hanger should have a metal threaded insert even if it isn't an aluminum/replaceable one so grease away the threads like you normally do. If it doesn't I'd be worried about if it was my frame.

Why do you think I said "nearly"? there are a handful that use a full carbon dropout and hanger (with a metal threaded insert), and some older ones used Ti, but the vast majority have aluminum dropouts bonded to carbon or have a replaceable Al hanger.

Swimming Workout of the Day:

Favourite Swim Sets:

2020 National Masters Champion - M50-54 - 50m Butterfly

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [Dror Sever] [ In reply to ]

Apr 20, 20 10:44

Post #10 of 17 (2282 views)

Didn't know they did that. This is my personal preference but next time I get a TT/Tri bike it has to have a replaceable derailleur hanger. I don't want one that is carbon (or rather fixed only non-replaceable) that doesn't have a threaded insert either. But that's my choice but I didn't know my Felt was like that when I bought it either (not as well versed back then as am I now about that stuff).

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [JasoninHalifax] [ In reply to ]

Apr 20, 20 10:48

Post #11 of 17 (2276 views)

I was just making a comment in jest. But if you are that wound up about my joke I apologize.

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [JasoninHalifax] [ In reply to ]

Apr 20, 20 10:51

Post #12 of 17 (2266 views)

Thanks a lot for all the info, and making sense out of it!

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [jaretj] [ In reply to ]

Apr 20, 20 10:56

Post #13 of 17 (2259 views)

Thanks a lot for the picture!!!

I cleaned the threads of the (brand new) derailleur hanger and now I can see the metal insert. To save a little bit of my dignity, the paint job is terrible and I hope the the anti seize plus inserting the rear derailleur will clear any paint residues where they should'st be.

So do you use typical anti seize? and ~7-8 Nm torque?

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [Dror Sever] [ In reply to ]

Apr 20, 20 11:05

Post #14 of 17 (2252 views)

Tighten it up.

The torque number isn't that important.

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [loxx0050] [ In reply to ]

Apr 20, 20 11:11

Post #15 of 17 (2247 views)

loxx0050 wrote:

I was just making a comment in jest. But if you are that wound up about my joke I apologize.

Sorry mate. with recent events around here and just WFH-fatigue in general, I've lost a bit of my sense of ha-ha. Don't apologize, we're all good...

edit, and I wasn't really wound up about it. just didn't realize it was a joke. my bad...

Swimming Workout of the Day:

Favourite Swim Sets:

2020 National Masters Champion - M50-54 - 50m Butterfly

Last edited by: JasoninHalifax: Apr 20, 20 11:14

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [JasoninHalifax] [ In reply to ]

Apr 20, 20 11:21

Post #16 of 17 (2238 views)

JasoninHalifax wrote:

loxx0050 wrote:

I was just making a comment in jest. But if you are that wound up about my joke I apologize.

Sorry mate. with recent events around here and just WFH-fatigue in general, I've lost a bit of my sense of ha-ha. Don't apologize, we're all good...

All good. I'm working from home too and wife is a displaced worker (self-employed and my state's system still says she doesn't qualify for unemployment benefits despite the CARES act being enacted weeks ago). We were at each others throats for a bit not too long ago too but things are kind of settling into a (for now) new norm (but I don't really like it though overall).

Re: Installing a rear dereailleur on a Carbon rear derailleur hanger (Cervelo p3) [Dror Sever] [ In reply to ]

Apr 20, 20 19:20

Post #17 of 17 (2181 views)

No anti-seize.

Sure 7-8 Nm sounds about right but I don't use a torque wrench on something like that.

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