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PostPosted: Sun Oct 21, 2007 12:12 pm 
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Joined: Mon Jan 15, 2007 7:59 am
Posts: 467
Location: Northern California, USA
Hi,

I am interested in drilling holes through the seat tube of my Kestrel Evoke to save weight. It looks like a sturdy bike and I feel that the seat tube is not very structural....any thought? How about the top tube?

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Everything can be drilled, except tires.


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PostPosted: Sun Oct 21, 2007 12:33 pm 
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Joined: Wed Oct 06, 2004 6:55 pm
Posts: 2319
Location: Vienna, AUT
Are you serious? :roll:

Drill away and see what happens. You'll enjoy picking out a new frame when the current one unravels.


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PostPosted: Sun Oct 21, 2007 12:37 pm 
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Joined: Thu Mar 10, 2005 2:27 pm
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Location: Belgium
You're kidding, right?
It'll look pretty cheap and not done!

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*Light is beautiful*
BMC SLC01 5900g ... Litespeed Vortex 6300g ... Merida Carbon Lite 7000g ... Velocite Selene 8000g ... Argon18 E114 +/-8500g ... Trek 1500 9500g


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PostPosted: Sun Oct 21, 2007 12:58 pm 
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Joined: Mon Sep 26, 2005 8:06 pm
Posts: 223
No, no, I disagree with the previous posters. Go right ahead. Put as many holes in it as you can. Try some in the chainstays too. And the headtube. And the top tube, especially around the junctions. Be sure to report back with the results. I'm already excited at what will happen. :twisted:


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PostPosted: Sun Oct 21, 2007 1:08 pm 
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Joined: Sun Oct 19, 2003 12:49 pm
Posts: 542
Location: Arbaz, Switzerland
GO, GO, GO HanSolo,
then you will have to buy my C50


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PostPosted: Sun Oct 21, 2007 1:13 pm 
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Location: Islip, NY
I think it will be fun to see what happens at someone else's expense. Be sure to post pics.

If you have carbon wheels you can reduce the weight by drilling out the sidewalls. Gotta reduce that rotating mass;-)

-Eric


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PostPosted: Sun Oct 21, 2007 1:38 pm 
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Rotating mass is most important and tyres are far too heavy, try putting some holes in them too.
:roll:


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PostPosted: Sun Oct 21, 2007 1:47 pm 
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Joined: Sat Jun 12, 2004 8:49 am
Posts: 2181
Location: Denmark
Don´t forget to drill the bottles.


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PostPosted: Sun Oct 21, 2007 1:53 pm 
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Joined: Sat Oct 13, 2007 7:16 am
Posts: 1343
Location: Lyon, France
It would depend if you drill them front-to back, or side-to-side. Both will save weight, but the lateral drilling will cause greater drag. Hence you will have an advantage only on grades above 12.6%, excepting the presence of a significant cross wind.

More advantageous would be to remove the seat-tube entirely with a hacksaw, cutting just above the BB and below the top-tube junction. This will also improve ride quality, but may make the bike ineligible for UCI-sanctioned events.

I've found surprisingly large weight benefits in drilling my bidon...

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Graham


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PostPosted: Sun Oct 21, 2007 1:53 pm 
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Joined: Mon Feb 05, 2007 5:39 am
Posts: 759
Location: Winnipeg Canada
This is a joke.... I hope?? :roll:


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PostPosted: Sun Oct 21, 2007 2:20 pm 
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Joined: Thu Nov 04, 2004 3:09 pm
Posts: 165
Location: Trail somewhere in Germany
First off, big drill-bit budget drilling holes in epoxy...

Absolutely crazy... but good for a laugh on a Sunday aternoon

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mountainbiking - the next best thing to sex


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PostPosted: Sun Oct 21, 2007 2:36 pm 
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Joined: Tue Nov 30, 2004 4:25 am
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Location: Tas, Aus
I think the only amusing thing is the mockery that is being heaped upon someone who is thinking of doing what this forum used to be about. I'd wait for someone who knows what they're doing to comment before doing anything but I imagine that the chainstays would be a good option for small holes. Good luck with it.


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PostPosted: Sun Oct 21, 2007 2:59 pm 
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Drilling holes in metal is a completely different matter. Metal has the same properties in all directions and so there are some areas that have lots of redundancies(/safety factor etc) built in. Carbon Fibre is a different beastie all together; layers are put together so that a minimal redundancy is present.

The only things that you can remove some material on it those things that bear no loading like headset spacers. NB. I've never understood why no one castleates spacers?


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PostPosted: Sun Oct 21, 2007 3:36 pm 
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Joined: Thu Oct 06, 2005 4:17 am
Posts: 1003
stumpytrunks wrote:
I think the only amusing thing is the mockery that is being heaped upon someone who is thinking of doing what this forum used to be about. I'd wait for someone who knows what they're doing to comment before doing anything but I imagine that the chainstays would be a good option for small holes. Good luck with it.


Sorry, but no one here has ever drilled holes in carbon fiber frames to lose weight. No one. Never.


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PostPosted: Sun Oct 21, 2007 3:52 pm 
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Joined: Tue Nov 30, 2004 4:25 am
Posts: 1140
Location: Tas, Aus
Agreed, maybe not the best idea, but the idea is what used to make this site. In my thinking you would only be breaking the strands of carbon that you are drilling through, and with small holes you probably aren't going to stuff up too much, structurally speaking, if you are drilling out low stress areas.

Bad idea or not, if he/she is willing to do it and knows the possible consequences, what can be the problem. It's worth a try.


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