What does that equate to on the bike and run. I’m assuming not much change in swimming other than maybe frontal area? If a 210lb guy can maintain 180W for 2 hours and 11 min miles, then loses 30 lbs instantly(fictional) what’s the change in power and speed? Thanks.
Less energy required to do everything in LIFE!
tfun~
I was recently wondering the same thing - can my performance changes be predicted if I drop from 205 to 185? With all of the calculators out there, I’m sure someone has the answer.
an arm?
I think it would mostly depend on what the compositition of that weight was?
If mostly fat, not necessarily more power, but certainly some speed gain.
All things (other than weight) remaining the same, try this:
http://qt2systems.com/Thoughts/weight.htm
-Jesse
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I’ll let you know in a few months. But this is the greatest I have ever felt, I swam a mile OW last week and I can tell a difference, and i’m only down 15 lbs. 15 to go.
on flat ground the biking may not change much, unless you have maintained the same power while losing 30lbs
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Jesse - thanks. Also, the calculator you have on there is very cool. Allows you to do some playing around with volumes, weight, etc.
http://www.triathloncalculator.com/
Of course, it’s all conjecture, but still fun to play with it.
Mike
It did not change race time with change in weight. Did it work for you?
On the other hand, it came within 40 secs of my latest oly time.
Actually no, it did not. Good point. Guess that answers the OP’s question… 
Jesse - is that a bug?
But the accuracy is pretty darn close:
IMUSA04
Swim
Predicted: 58:21
Actual: 59:57
Bike
Predicted: 5:42:52
Actual: 5:44:25
Run
Predicted: 5:00:36
Actual: 4:58:04
Total
Predicted: 11:51:56
Actual: 11:55:28
Not bad!
Put 30 lbs in a backpack and go for a bike/run. It isn’t exact, but it will give you an idea.
A few years ago I was doing hill repeats on the bike on the way to work. I had a backpack that weighed about 15 lbs that I left at the bottom of the hill. To get to work, I had to go up over the top so I brought the backpack for the final repeat. I could barely get over the top…I still think about riding up that hill when trying to decide between the large/small sandwich or whether to add the bag of chips and the brownie.
Hmm, according to this calculator my IM finish time would be 11:29:30…but my last IM was 9:50.
Take it with a grain of salt…
Actually, it’s not a bug. If you loose weight, the calculator will adjust for the bike time by using the wattage and weight inputs. For the run, if you were to loose weight, your 5k time would improve (by about 0.62% per pound lost) and therefore affect the input 5k time for the better thus changing the prediction. I hope this helps better explain things. Thanks!
-Jesse
Hi-
What inputs did you use? In my experience this large of an error is VERY uncommon. Thanks!
-Jesse
Try this: http://www.kreuzotter.de/english/espeed.htm
A 6 ft, 210 lb, rider with a 20 lb bike cycling at 90 rpm in no wind at sea level at 16 C in a tri position with race tires at 180 watts (phew!) would go at: 19.8 mph for that 2 hrs and 11 mins, or travel 43.23 miles (just under 70k). Obviously with a little wind and in a rolling course, you’d be a little slower.