Ever wondered how much effect losing weight from around the ballast (or from the bike) has on the time it take to climb Norton Summit, well here goes.

 

From cycle2max.com:

Norton Summit = 5.60 km

Average gradient = 4.9%

 

Using three examples from the list:

1. Brett Aitken:

time taken = 12 min 39 s

body weight + bike weight = 69 + 9 = 78 kg

Average speed = 26.6 km/h

Approx ave power = 390 W

 

a. Time (distance) saved of carrying 0.5 kg less (e.g. lighter wheels or empty 0.5 L water bottle) = 2.7 s (21 m)

b. Time (distance) saved of carrying 5.0 kg less (e.g lighter bike, wheels, no water bottles or tool kit & a diet) = 27 s (209 m).  Loss of significant bodyweight may reduce your power output.

 

2. Paul Smith

time taken = 18 min

body weight + bike weight = 93 + 8 = 101 kg

Average speed = 18.7 km/h

Approx ave power = 292 W

 

a. Time (distance) saved of carrying 0.5 kg less (e.g. lighter wheels or empty 0.5 L water bottle) = 4.4 s (23 m)

b. Time (distance) saved of carrying 5.0 kg less (e.g lighter bike, wheels, no water bottles or tool kit & a diet) = 43 s (223 m).  

 

3. Graham Page

time taken = 23 min 4 s

body weight + bike weight = 79 + 10 = 89 kg

Average speed = 14.6 km/h

Approx ave power = 190 W

 

a. Time (distance) saved of carrying 0.5 kg less (e.g. lighter wheels or empty 0.5 L water bottle) = 7 s (27 m)

b. Time (distance) saved of carrying 5.0 kg less (e.g lighter bike, wheels, no water bottles or tool kit & a diet) = 70 s (272 m).  

 

If you want to put your own numbers in use:

 

http://www.cycle2max.com.au/

and

http://www.analyticcycling.com/ForcesLessWeight_Page.html

 

Cheers chris

Tags: climbing., weight

Views: 1528

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Replies to This Discussion

intermermesting........so you are saying i need a really, really light bike..............

I need to look at this calculator on a daily basis to remind my stomach lighter is faster

You mean my bike isn't ideal for going up the veloway?

 

:-)

 

Simon

So in theory, when I at 104kg road up Nortons on Sunday on my Mongoose 18kg the altitude of Norton should have dropped by about 3cm. Maybe if we had a big boys day out doing repeats we could flatten that hill.

I tried to remodel a small section of the side of Gorge Rd a few years ago. Even with my weigh it didn't move any perceptible amount.

Now you need to calculate if riding with a slightly heavier bike will help people lose weight, and how much... So for example, if you put up with the 500g heavier wheels and therefore have to work a bit harder, will you lose 5kg over a month or so.?! If so, I'd keep your money for the wheels and take the 5kg!

Bah!

As much as being fit and of good lung/heart condition is important I reckon it is all to do with the head... It hurts I'm gonna sit down... or... it hurts I'm gonna get to that next corner/rise/tree/crest.. whatever... The body is in the red but the mind is commanding!

Then you get there recoup for a moment and kick again - sweet!

I tend to agree Ross, obviously form a purely scientific POV weight has a big effect on climbing but I reckon it's how we deal with the mental challenge that determines how we climb on a particular day.

Sure, not uncommon to see the pros emptying excess water when heading up.. no doubt smart tactics..

Elite athletes can sustain a power output of about 400W

 

A moderately fit person can sustain 200W of power.

 

If you really want to go up hills fast a 1000+ CC motorbike is the way to go. :-)

 

Most of them weigh well over 150 KG

Don, 400watts up hill or just average wattage over a set distance?

 

I agree, the lighter you are the better coupled with strong cardio output e.g. heart / lungs as well mental attitude of Jens Voigt plus light bike = FYLIN

The literature I read was over 4000m on a track it was considered that 4 Km would be typical of what people can sustain for a prolonged period.

 

It seems likely that well trained people could achieve a lot more for a very short period such as a track sprint.

 

Obviously a well maintained bike will mean that more of the energy goes into moving the bike.

 

Even an under inflated tire will reduce efficiency.

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