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PostPosted: Thu Jul 19, 2012 4:58 pm 
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Joined: Mon Dec 14, 2009 6:26 pm
Posts: 833
It seems obvious that they would but my light bike doesn't seem to make any appreciable difference in performance compared to my commuter. There is about 1.5 kg difference. I haven't tested it on 16K mountain climbs but on some tough hills.


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Posted: Thu Jul 19, 2012 4:58 pm 


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PostPosted: Thu Jul 19, 2012 5:08 pm 
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Joined: Fri Oct 07, 2011 2:08 pm
Posts: 1365
A few guys I meet on the road use a steel heavy bike to train with and a carbon bike to race on .
They don't think it makes that much difference more about the mind set, getting there racing head on having the best equipment .


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PostPosted: Thu Jul 19, 2012 5:09 pm 
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Joined: Wed Feb 02, 2011 3:48 am
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It makes 1.5kg difference then - simple maths.


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PostPosted: Thu Jul 19, 2012 6:04 pm 
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Location: Athens, Greece
Add your weight (plus, helmet, clothes, bottles etc. etc.) to the bike's weight and see what % is the total difference. You 'll realise it is not that much.

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PostPosted: Thu Jul 19, 2012 6:14 pm 
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Joined: Mon Mar 19, 2012 3:31 pm
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Lighter riders climb more easily. i have a steel bike that rockets up climbs, helped by the fact that i've lost 5 kilo's. Steel forever, carbon never.


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PostPosted: Thu Jul 19, 2012 6:33 pm 
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If people don't think it makes a significant difference, then why is there a Weight Weenies forum ? :noidea:

We could all just join Weight Watchers if it were all about body weight. :thumbup:


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PostPosted: Thu Jul 19, 2012 6:57 pm 
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Location: Los Angeles / Glendale, California
Rick wrote:
If people don't think it makes a significant difference, then why is there a Weight Weenies forum ? :noidea:


Because some of us enjoy the feel of light bikes, experimenting with technology and material limits.

Others are attracted to a international forum that tends to show high end equipment, and then will purchase their way towards a light-weight setup.
However these same people tend to be the ones that do not account for fitness. Light bikes are not a replacement for good fitness.
See signature.

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PostPosted: Thu Jul 19, 2012 7:39 pm 
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Location: BELGIUM
if a 80kg rider+bike system rides a 15km climb at 7% at 250W, losing 1.5kg will make you roughly 60 seconds faster.
that's assuming all other factors are equal.
see analyticcycling.com

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PostPosted: Thu Jul 19, 2012 10:36 pm 
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Also to be considered: What is "a significant difference in performance" ?
Bike races are typically not uphill time trials. So the difference of a few seconds or 10 yards can be the difference between "being in the lead pack" and "dropped", which typically translates into an enormous difference in final time and placing.

So no one is claiming that a light bike makes up for poor fitness, but a light bike can contribute to a significant difference in performance.

I would suspect that nearly everyone who actually races would have had the experience of being only one or two bike lengths behind a group at a critical point in the race, yet just be unable to close that last gap no matter how hard you try. Since you are already as fit as you are going to be at that point, I would be delighted to have 1.5 kg less bike to have to accelerate. :)

Of course if you don't race, and just time trial up hills, you would never notice the small difference weight makes and it would be swamped out by a lot of other variables. So it could also be said that it DOESN'T make a significant difference to performance.


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PostPosted: Thu Jul 19, 2012 11:11 pm 
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Location: Hungary
I had to race my steel winter bike in the spring, as my carbon bike was not ready yet.
It's around 4kgs heavier. I was terrible. Now I have my carbon bike, with some aero wheels and I'm flying.
Obviously it's the bike. ;)


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PostPosted: Fri Jul 20, 2012 12:35 am 
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You can do 'what if' calcs here: http://www.analyticcycling.com/

1 kg makes 8 sec difference in 2.25km at 9% gradient.
Not much but significant in competition.

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PostPosted: Fri Jul 20, 2012 2:15 am 
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Rick wrote:
I would suspect that nearly everyone who actually races would have had the experience of being only one or two bike lengths behind a group at a critical point in the race, yet just be unable to close that last gap no matter how hard you try. Since you are already as fit as you are going to be at that point, I would be delighted to have 1.5 kg less bike to have to accelerate. :)
\

Indeed. I love the Team Sky "marginal differences" philosophy. It's what drives the philosophy of this forum. "Every gram counts".

But there's a difference between how a frame feels and what it actually does. For example a heavier, stiffer frame may feel like it's climbing faster, yet be slower. Perception is a very poor measure of actual speed.

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PostPosted: Fri Jul 20, 2012 9:44 am 
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ave wrote:
I had to race my steel winter bike in the spring, as my carbon bike was not ready yet.
It's around 4kgs heavier. I was terrible. Now I have my carbon bike, with some aero wheels and I'm flying.
Obviously it's the bike. ;)


I had my doesn't fit me alu bike in the winter, as my lightweight steel bike wasn't ready, it's around 500g's lighter, and now i'm flying.


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PostPosted: Fri Jul 20, 2012 9:57 am 
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Joined: Tue Apr 12, 2011 8:08 am
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Location: Pedal Square
On top of all the advantages already mentioned, it's easier to take a light bike up and down the roof rack. :beerchug:

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PostPosted: Fri Jul 20, 2012 12:09 pm 
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Joined: Tue Dec 27, 2011 2:19 pm
Posts: 651
nope not at all don't believe the hype!
:beerchug:

I would be more concerned about stiffness, the less flex in the frame, the more juice goes into pushing you uphill.


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Posted: Fri Jul 20, 2012 12:09 pm 


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