strength of bottle bosses on a carbon frame

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jomoj
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Joined: Wed Nov 24, 2004 16:25 pm

strength of bottle bosses on a carbon frame

Postby jomoj » Fri Dec 07, 2012 09:34 am

I have a bracket for a minipump that bolts onto bottle cage bosses and can be fitted between cage and frame and was planning to use this on a new carbon bike. I've seen warnings about the fact that the tube wall can be cracked around the boss if the bottle is allowed to rattle about so was wondering how strong the bosses are on carbon frames (bit of a general question I know) and whether using a longer bolt to fit through the bottle cage and clip would be a problem - potentially increasing the leverage of the cage when the bottle is being taken out and put back.

possibly paranoid but this is my first carbon frame and I don't want to knacker it prematurely!

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schweiz
Posts: 1618
Joined: Sun Aug 31, 2008 18:51 pm

Re: strength of bottle bosses on a carbon frame

Postby schweiz » Fri Dec 07, 2012 10:43 am

...and I thought I was paranoid when putting my bike on the car bike rack!

It'll be fine!

KINGGARY
Posts: 76
Joined: Sun Oct 19, 2008 14:32 pm

Re: strength of bottle bosses on a carbon frame

Postby KINGGARY » Fri Dec 07, 2012 11:21 am

It will be fine, I've had that setup on my last 2 carbon frames with no issues and I use large water bottles which increases the load.

jomoj
Posts: 729
Joined: Wed Nov 24, 2004 16:25 pm

Re: strength of bottle bosses on a carbon frame

Postby jomoj » Fri Dec 07, 2012 12:32 pm

cheers - I'm just a bit late to the carbon party, it's a bit of a mental hurdle to get over.

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Monty Dog
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Joined: Thu Dec 14, 2006 14:31 pm

Re: strength of bottle bosses on a carbon frame

Postby Monty Dog » Fri Dec 07, 2012 12:38 pm

Problems with cracking I suspect would be due to vibration e.g. loose screw in frame rather than the additional load of the bottle cage and pump. Just make sure that the screws are firm and suggest you don't use those humungous 1 litre bottles that people use. Also use a cage that grips the bottle firmly - some superlight ones are pretty flexy and you can see the bottle moving - also means it's more likel to fall out.
Make mine an Italian, with Campagnolo on the side..

jomoj
Posts: 729
Joined: Wed Nov 24, 2004 16:25 pm

Re: strength of bottle bosses on a carbon frame

Postby jomoj » Fri Dec 07, 2012 15:06 pm

cheers, shouldnt be a problem with loose bottles, I have some Lezyne Flow cages which are pretty grippy, if anything a bit too secure.

markdavidhill
Posts: 205
Joined: Thu May 19, 2011 19:36 pm

Re: strength of bottle bosses on a carbon frame

Postby markdavidhill » Sat Dec 08, 2012 20:04 pm

jomoj wrote:cheers - I'm just a bit late to the carbon party, it's a bit of a mental hurdle to get over.


Went to the carbon party. Left before midnight.
Team Madison Genesis Volare & Condor Super Acciaio


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