Cervelo s5 Pressfit

Discuss light weight issues concerning road bikes & parts.
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Cyppen
Posts: 133
Joined: Thu Sep 04, 2008 7:48 pm
Location: Copenhagen

by Cyppen

Just bought a cervelo s5 with bbright.

I have a DA SRM so i Got a net BB Press fit bearing.
Everytime i riding the Pressfit cup losing from the Frame in the drive side.

Should i use locktite?
Or get a new pressfit bearing?

http://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=55651&start=0
Cervélo S3 - Custom Painted
Cervélo Soloist Carbon
Cervélo Soloist Team
SRM PC7 - Dura Ace7900 :D


by Weenie


wingguy
Posts: 4134
Joined: Thu Mar 08, 2012 11:43 pm

by wingguy

Yes you should be using locktite. I would also check you've put the crank together properly. Correct me if I'm wrong but while an imperfectly fitted PF bearing will creak, the preload from the crank shouldn't permit it to migrate loose in the frame no matter how poor the bearing fit is :noidea:

kode54
Posts: 1275
Joined: Tue May 23, 2006 9:39 pm

by kode54

use the Loctite 609.. its red.
- AX Lightness Vial EVO D + DA9150 + Enve SES 4.5 carbon hubs
- Parlee Altum + DA9150 + Enve SES 4.5 carbon hubs
- Parlee ESX + DA9150 + THM SRM PM + Enve SES 6.7 CK hubs
- Guru Praemio R Titanium + DA9150 + Enve 3.4 CK hubs

1415chris
Posts: 1104
Joined: Sat Apr 18, 2009 8:59 am
Location: Surrey UK

by 1415chris

You would also need a primer 7649.
But honestly I would scrap these plastic cups and replace them with aluminium screwed-together bottom bracket.

hambini
Posts: 299
Joined: Tue Nov 15, 2016 8:13 am

by hambini

I would use 7649 and medium strength 641 retaining compound.

Some of the red loctites (number not specified) will trash the carbon.

I've got an S5 and I found there was quite a bit of misalignment between the left and right sides which caused the creaking.

Geoff
Posts: 5163
Joined: Sat Dec 13, 2003 2:25 am
Location: Canada

by Geoff

I am running a similar set-up. I have not been able to solve that issue with a solution that lasts. I am thinking of going to a threaded BB solution now.

by Weenie


1415chris
Posts: 1104
Joined: Sat Apr 18, 2009 8:59 am
Location: Surrey UK

by 1415chris

hambini wrote:I would use 7649 and medium strength 641 retaining compound.

Some of the red loctites (number not specified) will trash the carbon.

I've got an S5 and I found there was quite a bit of misalignment between the left and right sides which caused the creaking.
This is what I was suspecting with my S5 when after short period of time two bearings (oryginal Rotor and Enduro replacement) on NDS started grinding.
After swaping plastic cups for aluminium threaded-together bb (Wheels mfg) similar thing happened with Enduro angular bearing, this time on DS :)
I gave up on Enduro bearings, went for NTN LLB ultra low friction seal bearings (from hambini). So far so good.
Having said all that, for number of years I didn't have any issues using plastic Sram bb-right bb on R5.

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