Which Bottom Bracket

Discuss light weight issues concerning road bikes & parts.
Foxman50
Posts: 28
Joined: Sat Jun 15, 2019 9:40 pm

by Foxman50

@moonoi would you mind posting a link from another site please. Unfortunately we, in the UK, are restricted from viewing the competitive cyclist website. No idea why this should be but we get redirected to Alpine trek of all places. Thanks

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moonoi
Posts: 570
Joined: Sat Nov 21, 2015 3:04 pm
Location: Earth

by moonoi

Foxman50 wrote:@moonoi would you mind posting a link from another site please. Unfortunately we, in the UK, are restricted from viewing the competitive cyclist website. No idea why this should be but we get redirected to Alpine trek of all places. Thanks
https://www.merlincycles.com/shimano-du ... 68230.html



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Foxman50
Posts: 28
Joined: Sat Jun 15, 2019 9:40 pm

by Foxman50

@moonoi, really appreciate that, so that whole unit would pressfit into the existing Colnago threaded cups

moonoi
Posts: 570
Joined: Sat Nov 21, 2015 3:04 pm
Location: Earth

by moonoi

Yes, but if you haven't got the proper tools to ensure it goes in straight on each side, suggest letting your LBS do it.

You press each side in separately.

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Foxman50
Posts: 28
Joined: Sat Jun 15, 2019 9:40 pm

by Foxman50

Thanks so much for all your responses. This has been so helpful. Cheers

Foxman50
Posts: 28
Joined: Sat Jun 15, 2019 9:40 pm

by Foxman50

I seem to read contradictory comments regards installing grease, or "Morgans Blue Aquaproof paste" as recommended between the colnago thread fit cups and the press fit cups.
Should the press fit be dry or greased, if dry where do you use the "Morgans Blue Aquaproof paste"

IvanZg
Posts: 58
Joined: Thu Jan 10, 2019 3:10 pm

by IvanZg

I have my dura ace bb installed with above mentioned paste and it works great, no squeaks...


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Foxman50
Posts: 28
Joined: Sat Jun 15, 2019 9:40 pm

by Foxman50

Thanks Ivan, so a small amount of paste between the Colnago threaded cup inner and the Shimano cup outer.

Foxman50
Posts: 28
Joined: Sat Jun 15, 2019 9:40 pm

by Foxman50

@calnago would you kindly add your recommendation regards Morgan Blue or dry for press fitting the Shimano bearing cup into the Colnago threaded cups. Appreciate your help as you have an immense amount of experience here.
My 9100 groupset is on order, and have ordered said Morgan Blue and some Park Tool PPL-1 in anticipation but want to do this once n once only so want to get it right. Cheers

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Calnago
Posts: 8425
Joined: Sun Nov 07, 2010 9:14 pm

by Calnago

@Foxman: If you’re just using the Shimano BB, I’d probably just press it in dry, completely dry. The Colnago cups are alloy and nice and round with good tolerances. The Shimano BB is Delrin (or some composite) so I wouldn’t worry about corrosion. If it makes a peep, then I wouldn’t hesitate to pop it out and use a little retaining compound (Loctite 609) and primer (loctite 7649).
Every install is kind of a case by case basis. I usually measure the bore on several axis with very good vernier calipers then decide what I want to do.
Just make sure the Threadfit cups are tight in the frame. You may be on the verge of overthinking this now. Install it dry, and you should be ok. If you want to use the AquaProof Paste; the place to use it would be a little film between the surface of the Threadfit cups and the outer surface of the Shimano cups.
If you want to wbsolutley sure it doesn’t move then you could use retaining compound and primer inbetween the Shimano BB and the Threadfit cups. But that does make it harder to remove when you have to.
Colnago C64 - The Naked Build; Colnago C60 - PR99; Trek Koppenberg - Where Emonda and Domane Meet;
Unlinked Builds (searchable): Colnago C59 - 5 Years Later; Trek Emonda SL Campagnolo SR; Special Colnago EPQ

Foxman50
Posts: 28
Joined: Sat Jun 15, 2019 9:40 pm

by Foxman50

@Calnago, much appreciated and yes you ar probably right, just like to have all tge bases covered. No doubt, as is usual with this stuff, the theory seems harder than the practical. Cheers

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