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Author Topic: Building a sub 8kg bike  (Read 17361 times)

bikenerd

Building a sub 8kg bike
« on: 14 August, 2008, 01:05:13 pm »
Maybe one for weight-weenies, but 8kg isn't ridiculously light.

Is the only way to build a sub 8kg bike to spend a ton of money on it?  Would you need a carbon frame?  Or, with modern components, is it quite possible?

I'm thinking of buying a fast bike to do fast, less than 3 hour rides and not get laughed out of the Uni bike club (again).  Any suggestions?
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gonzo

Re: Building a sub 8kg bike
« Reply #1 on: 14 August, 2008, 01:08:48 pm »
UCI weight limit is 6.81kg and the easily breakable without spending that much money on it.

What's the budget?

(PS. weight weenies might be your best bet)
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bikenerd

Re: Building a sub 8kg bike
« Reply #2 on: 14 August, 2008, 01:13:28 pm »
Quote from: gonzo on 14 August, 2008, 01:08:48 pm
UCI weight limit is 6.81kg and the easily breakable without spending that much money on it.

What's the budget?

(PS. weight weenies might be your best bet)

Around £1000.  I was thinking of a triple butted aluminium frame, all carbon fork, Campag Veloce groupsets, Campag Scirroco wheels.  Plus usual finishing kit: carbon seatpost, alu stem and bars, Selle Italia Flite Ti saddle.
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tiermat

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Re: Building a sub 8kg bike
« Reply #3 on: 14 August, 2008, 01:14:36 pm »
Unless you are stuck on wanting Campaq, maybe a Focus Cayo would be a good bet? they can be got for around £1K and sound like they would fit your bill.
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bikenerd

Re: Building a sub 8kg bike
« Reply #4 on: 14 August, 2008, 01:18:09 pm »
Quote from: tiermat on 14 August, 2008, 01:14:36 pm
Unless you are stuck on wanting Campaq
I'm afraid I am, being an awkward git! :)
Seriously, though, I like Campag ergo shifters: I've got quite small hands and they're more comfortable.  I also like the aesthetics of Campag. ::-)
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tiermat

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Re: Building a sub 8kg bike
« Reply #5 on: 14 August, 2008, 01:19:38 pm »
Fair enough, I can't blame you, personally I like Shimano for pretty much the same reason, except I have big hands...

although I do have Campaq FB levers and shifters on my hack bike, and they are much nicer than shimano's rapidfire jobbies...
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tiermat

  • According to Jane, I'm a Unisex SpaceAdmin
Re: Building a sub 8kg bike
« Reply #6 on: 14 August, 2008, 01:24:47 pm »
Or how about a Ribble Dedacciai Nero Corsa Centaur 10 Double from Ribble?

£995 and pretty much customisable to your liking (including the width of the bars...)

And the XL weighs in at 17.5lb, so should be about right for your target weight...
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bikenerd

Re: Building a sub 8kg bike
« Reply #7 on: 14 August, 2008, 01:29:14 pm »
Quote from: tiermat on 14 August, 2008, 01:24:47 pm
Or how about a Ribble Dedacciai Nero Corsa Centaur 10 Double from Ribble?

£995 and pretty much customisable to your liking (including the width of the bars...)

Thanks, I've been looking at the Ribble web site but it doesn't work properly on any of the web browsers I have available to me (Firefox on Linux and Safari / Firefox on Mac).
That's a lot of bike for the money! :)
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tiermat

  • According to Jane, I'm a Unisex SpaceAdmin
Re: Building a sub 8kg bike
« Reply #8 on: 14 August, 2008, 01:35:22 pm »
It is and has some good reviews, the nearest "big name" bike I can find with the same grouppo is a Bianchi, but that is a alu/carbon frame and £125 more!!!

Oh no I have a sudden n+1 urge :(
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PrettyBoyTim

Re: Building a sub 8kg bike
« Reply #9 on: 14 August, 2008, 01:42:10 pm »
Buy a bike like mine and saw it in half...  :-\
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mike

Re: Building a sub 8kg bike
« Reply #10 on: 14 August, 2008, 01:43:21 pm »
I think the ribble nero corsa is the same frame as my condor barrachi (last years model) but 400 quid cheaper. Lovely bike, you're very welcome to try it if you're near cambridge and tallish.
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αdαmsκι

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Re: Building a sub 8kg bike
« Reply #11 on: 14 August, 2008, 01:47:47 pm »
Quote from: bikenerd on 14 August, 2008, 01:29:14 pm
Thanks, I've been looking at the Ribble web site but it doesn't work properly on any of the web browsers I have available to me (Firefox on Linux and Safari / Firefox on Mac).

I use Linux & firefox & I ended up with the same problem.  In the end I used Internet Explorer via the work computer.   Does the IE Tab add on work for Mac?
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gonzo

Re: Building a sub 8kg bike
« Reply #12 on: 14 August, 2008, 02:58:23 pm »
Your best bet is probably e-bay for the groupo, especially with the new range of campa out soon.
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Greenbank

Re: Building a sub 8kg bike
« Reply #13 on: 14 August, 2008, 03:06:47 pm »
The Ribble site is pretty crap. I can only get the bikebuilder or special_edition_bikes sections to work with IE and not FF or Safari (PC or Mac).

The Ribble CF bikes do look lovely. I'm either going for a Ribble Scuro HCR with Centaur (£1400) or going the whole hog and getting a Wilier Izoard Pro (CF Centaur for £2200). It'll be next year and using the cycle2work scheme which is part of the justification for spending more.

Wilier Mortirolo with Mirage is about the cheapest from them at about £1250. You might be able to find one in a sale for £1000. Yup cyclesurgery have them with £275 off so down to £1099.
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MSeries

Re: Building a sub 8kg bike
« Reply #14 on: 14 August, 2008, 08:12:45 pm »
save weight by putting less stuff on it. 1 chainring, one sprocket, no pawls, short chain, no rear brake, etc etc

1
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Greenbank

Re: Building a sub 8kg bike
« Reply #15 on: 15 August, 2008, 11:48:20 am »
Quote from: MSeries on 14 August, 2008, 08:12:45 pm
save weight by putting less stuff on it. 1 chainring, one sprocket, no pawls, short chain, no rear brake, etc etc

1

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6.2kg for a 56CM frame, but it's £1650.
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Zoidburg

Re: Building a sub 8kg bike
« Reply #16 on: 18 August, 2008, 06:23:24 pm »
Quote from: bikenerd on 14 August, 2008, 01:05:13 pm
I'm thinking of buying a fast bike to do fast, less than 3 hour rides and not get laughed out of the Uni bike club (again).  Any suggestions?
And you want to ride with these snobby tossers because?
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vorsprung

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Re: Building a sub 8kg bike
« Reply #17 on: 18 August, 2008, 06:26:14 pm »
if you own a 10kg bike already you could just loose 2kg of body weight
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David Martin

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Re: Building a sub 8kg bike
« Reply #18 on: 18 August, 2008, 07:10:35 pm »
Quote from: bikenerd on 14 August, 2008, 01:05:13 pm
I'm thinking of buying a fast bike to do fast, less than 3 hour rides and not get laughed out of the Uni bike club (again).  Any suggestions?

Turn up on a heap of 70's junk and kick their butts. You may need to do a bit of training and have some talent first though...

..d
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bikenerd

Re: Building a sub 8kg bike
« Reply #19 on: 19 August, 2008, 08:37:58 am »
To be fair, I didn't get laughed at too often after I beat most of them up the hills, on my Surly Pacer with mudguards and a carradice.
Just imagine how far ahead I can be on a bike weighing 3 kg less! :)
I'll be taking my Moulton on the fresher's ride this year.  I may have to photograph the facial expressions.

(Seriously, though, they're an inclusive club.  The members are all a bit young, so don't realise the benefits of mudguards and a relaxed bike and automatically assume a bike with guards is a tourer).
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mattc

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Re: Building a sub 8kg bike
« Reply #20 on: 19 August, 2008, 08:51:46 am »
I find downtube shifters have quite an effect on that age group. In their world it's like riding a penny-farthing, or solid tyres.
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valkyrie

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Re: Building a sub 8kg bike
« Reply #21 on: 27 August, 2008, 10:59:43 pm »
For just under £1500 I built up a bike that weighs just 7kg. I haven't actually weighed it (don't have suitable scales), but that's the weight I get if I add all the components together. Trick is to take your time whilst scouring eBay and various other websites. The bike is -
Look 565 Frameset
Campag Centaur Carbon Groupset
Campag Neutron Ultra Wheelset
Deda Newton Bars/Stem
Campag Chorus Seatpost
Selle Italia MaxFlite saddle
Vredstein Tyres

I didn't start off looking to build a light bike, but having got the frame cheap on eBay I then found myself looking at the weight of everything. It does actually make me go a bit faster than my other bike. Merlin Cycles are a good place for deals on Campag groupsets, a lot of the rest came from Ribble (during one of their sales).
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Séamas M.

Re: Building a sub 8kg bike
« Reply #22 on: 27 August, 2008, 11:48:39 pm »
Text rescued from a 2006 post of mine on some other forum.
Quote
50cm XACD road frame and fork, Veloce 10sp with compact chainset, Chorus headset,  Chorus carbon seatpost topped with a Selle Italia Flite, Xero XR-1's wearing Continental Gatorskins, and finished with Tacx Tao bottle cages.  Weight is 8.8kg



It Lapped the Lough last weekend and it's still wearing the original Gatorskins!  Overall cost was probably about £1100.

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gonzo

Re: Building a sub 8kg bike
« Reply #23 on: 28 August, 2008, 09:10:55 am »
Quote from: Séamas M. on 27 August, 2008, 11:48:39 pm
Weight is 8.8kg
...
Overall cost was probably about £1100.

Over budget and under spec, do you work for the government by any chance ;)
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border-rider

Re: Building a sub 8kg bike
« Reply #24 on: 28 August, 2008, 09:15:41 am »
Quote from: gonzo on 28 August, 2008, 09:10:55 am

Over budget and under spec, do you work for the government by any chance ;)

I think you mean

"Do you work as a private contractor on a big Government IT contract?"

;)

Oh no, sorry, that would be

"It's only got one wheel, it's made of lead, we forgot to put a chain on and the frame is the wrong shape.  Can we have our money + 20 % please ?"

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