Do light frames climb more easily?

Questions about bike hire abroad and everything light bike related. No off-topic chat please

Moderator: Moderator Team

konky
Posts: 839
Joined: Mon Dec 14, 2009 6:26 pm

by konky

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.

by Weenie


artray
Posts: 1365
Joined: Fri Oct 07, 2011 2:08 pm

by artray

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 .

jooo
Posts: 1504
Joined: Wed Feb 02, 2011 3:48 am

by jooo

It makes 1.5kg difference then - simple maths.

User avatar
kgt
Posts: 6717
Joined: Sun Jun 18, 2006 10:29 am
Location: Athens, Greece

by kgt

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.

ticou
Posts: 459
Joined: Mon Mar 19, 2012 3:31 pm

by ticou

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.

User avatar
Rick
Posts: 2001
Joined: Sat Aug 29, 2009 4:30 pm

by Rick

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:

User avatar
prendrefeu
Posts: 8577
Joined: Wed Oct 31, 2007 10:32 pm
Location: Los Feliz, Los Angeles, California
Contact:

by prendrefeu

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.
Exp001 || Other projects in the works.

User avatar
strobbekoen
Posts: 4446
Joined: Wed May 18, 2005 6:24 pm
Location: BELGIUM

by strobbekoen

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

User avatar
Rick
Posts: 2001
Joined: Sat Aug 29, 2009 4:30 pm

by Rick

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.

User avatar
ave
Posts: 1657
Joined: Sun Dec 28, 2008 10:15 pm
Location: Hungary

by ave

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. ;)

BobSantini
Posts: 292
Joined: Sun Jul 10, 2011 9:03 am

by BobSantini

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.
r o y g b i v

User avatar
djconnel
Posts: 7926
Joined: Wed Sep 26, 2007 1:57 pm
Location: San Francisco, CA
Contact:

by djconnel

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.

ticou
Posts: 459
Joined: Mon Mar 19, 2012 3:31 pm

by ticou

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.

HillRPete
Posts: 2292
Joined: Tue Apr 12, 2011 8:08 am
Location: Pedal Square

by HillRPete

On top of all the advantages already mentioned, it's easier to take a light bike up and down the roof rack. :beerchug:

by Weenie


mjduct
Posts: 662
Joined: Tue Dec 27, 2011 2:19 pm

by mjduct

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.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post