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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.
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:
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?
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!
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.