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PostPosted: Wed Jan 04, 2017 4:32 pm 
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Joined: Wed Jan 04, 2017 4:22 pm
Posts: 1
My bike is in the shop at the minute having a full strip down/service etc

I want to put my new R9100 crank on this frame, but my LBS has said i need a new BB, fair enough, i wanted it changed anyway, but he has said it is an extra £140, now that seems like a high markup to me for a BB, i am already paying £170 for the service, taking out and re-greasing was part of the price

Can anyone confirm that the below product is what i need, with no other shims necessary...

Rotor Press Fit 46-24mm Convertor Steel Bearings

http://www.sigmasport.co.uk/item/Rotor/ ... rings/2KFI

Thanks and happy new year


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PostPosted: Wed Jan 04, 2017 5:18 pm 
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Joined: Wed Jan 10, 2007 10:56 pm
Posts: 1378
Location: Canada
This can be used as well. Then you retain your existing BB in case you ever want to go back to the bbright crank set.

http://www.totalcycling.com/en/ca/Wheels-Manufacturing-BBRIGHT-adapter-for-Shimano-24mm-Spindle-Cranks/m-21200.aspx


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Posted: Wed Jan 04, 2017 5:18 pm 


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PostPosted: Wed Jan 04, 2017 5:23 pm 
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Joined: Thu Mar 08, 2012 11:43 pm
Posts: 3284
The internal sleeve with that one is sized for a PF30 shell width (I think). There is a specific BBright system with essentially the same bearings here http://www.sigmasport.co.uk/item/Rotor/BBright-to-Shimano-Converter/SQP?s=1

£140 is nuts, unless he's quoting you for a ceramic BB :noidea:


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PostPosted: Wed Jan 04, 2017 7:45 pm 
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Joined: Tue Nov 15, 2016 8:13 am
Posts: 83
CerveloFTW wrote:
My bike is in the shop at the minute having a full strip down/service etc

I want to put my new R9100 crank on this frame, but my LBS has said i need a new BB, fair enough, i wanted it changed anyway, but he has said it is an extra £140, now that seems like a high markup to me for a BB, i am already paying £170 for the service, taking out and re-greasing was part of the price

Can anyone confirm that the below product is what i need, with no other shims necessary...

Rotor Press Fit 46-24mm Convertor Steel Bearings

http://www.sigmasport.co.uk/item/Rotor/ ... rings/2KFI

Thanks and happy new year


I had exactly the same scenario as this and sigma recommended the same bottom bracket to me. The rotor bottom bracket is utter rubbish. The shimano crank has a 24mm axle and the standard cervelo housing is a 46mm hole. You will probably find the rotor bottom bracket creaks like crazy - mine did so I ended up designing and making my own. After disassembling it I found the rotor BB had terrible manufacturing tolerances and the Cervelo shell wasn't right either. I ended up going with a one piece design, it's a lot stiffer, doesn't creak and I ride it all year round. The only thing I change is bearings every 6 months.

Here are a few videos I did about it. Everything about Cervelo BBright https://youtu.be/9IlWUVfAVEE

Here's the bottom bracket that I made https://youtu.be/b5E3nDLUu4M

And here's how to fit it into a Cervelo S5 - same BB setup https://youtu.be/PxN2X59VWA0?list=PLWIl ... oG7Tbn97uz

Additionally, I dislike it when companies fleece the consumer so here's some drawings if you want to make your own

http://www.hambini.com/downloads/ go down to BBright

I'm not very good at writing stuff but here's the page with my findings http://www.hambini.com/cycling/cervelo- ... -creaking/


Hope that assists you

Hambini

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The science behind Aero Road wheels!!
Ceramic v Steel Bearings: The Truth
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PostPosted: Wed Jan 04, 2017 9:49 pm 
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Joined: Tue Dec 23, 2008 2:57 pm
Posts: 864
Location: NYC
...not sure where your LBS is coming up with the absurd £140, I would very much question that.

Also, make sure that the mechanic is installing using Loctite 609 or stronger and activator....no exceptions! If they won't install with the Loctite then take it elsewhere. EM3

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My 2013 Cervelo R5


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PostPosted: Thu Jan 05, 2017 3:17 pm 
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Joined: Mon Dec 26, 2016 8:12 pm
Posts: 18
I'm on my third rotor pressfit in 4 years.. creaky creaky! The 46-24 one fits my 2012 R5 and cost £30 ish


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PostPosted: Fri Jan 06, 2017 12:50 am 
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Joined: Tue Dec 23, 2008 2:57 pm
Posts: 864
Location: NYC
richievet wrote:
I'm on my third rotor pressfit in 4 years.. creaky creaky! The 46-24 one fits my 2012 R5 and cost £30 ish


Got Loctite??

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My 2013 Cervelo R5


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PostPosted: Sun Apr 02, 2017 12:46 am 
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Joined: Sat Aug 05, 2006 2:29 am
Posts: 1422
Location: Mountain View, California
that price doesn't sound outrageous...

https://www.bbinfinite.com/products/bbr ... it-shimano

is around that price.

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PostPosted: Sun Apr 02, 2017 10:08 am 
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Joined: Fri Mar 09, 2007 1:26 am
Posts: 594
Location: USA
Wheels Manufacturing has a adapter for about $30... Any thoughts on that. I have used those on a few bikes without any issues,


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Posted: Sun Apr 02, 2017 10:08 am 


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PostPosted: Sun Apr 02, 2017 11:10 am 
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Joined: Tue Nov 15, 2016 8:13 am
Posts: 83
The problem with an adaptor is you have an tolerance stack up which means you are more liable to get creak. It also relies on plastic to transmit a part axial and radial load. Plastic is not good at that.

If you are not shooting up hills or on very light use I think an adaptor would be okay. A lot of my customers say once they've had an engineered bottom bracket they are reluctant to go back to anything else because they can detect the stiffness difference.

Hambini

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Hambini
The science behind Aero Road wheels!!
Ceramic v Steel Bearings: The Truth
Visit the Hambini Website


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