What's 10lbs off your bike worth?

Triathlon Forum
1

This is pretty awesome: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2999990/
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2

HA! This makes it even more funny when you see a guy riding a $10,000 bike who has very little fitness. WORK ON THE ENGINE!! But i guess if you have the money to blow, why not.

3

Indeed!

4

Christmas issue - topics not necessarily to be taken 10-0% seriously :wink:
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5

wonderful, thank you…

“The power required to overcome drag on a touring bike—steel, carbon or chocolate framed—at 15 mph (24 kph) is about 170 watts.”
but the real question is, dark or milk ?

6

Crap…guess I have no excuses now. :slight_smile:

7

if they added 10lbs to a wheel who knows how fast theyd gone
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8

For you…means you can go eat 10 lbs more of food. :wink:

You going to be in penticton next weekend?

9

He was commuting, and with red lights. Not surprised by the results.

Although I like how the “light” bike was 20.9 pounds.

10

I wonder how the aerodynamics of the steel frame compare with those of the carbon frame. I would imagine that the steel frame having smaller tubes would make it more aerodynamic. He also noted that he was more comfortable on the steel frame, maybe it fit him better?

11

I would think that red lights would exacerbate any difference with the repetitive acceleration.

12

Not as much as 10g of drag…

13

**Conclusions **A lighter bicycle did not lead to a detectable difference in commuting time. Cyclists may find it more cost effective to reduce their own weight rather than to purchase a lighter bicycle.

Hilarious! I love comical issues of science journals.

14

Seems to me there was a big difference in his seat height as well. So many variables here.

15

according to schwalbes website the marathon plus is a slower rolling resistance tire than the marathon

so his entire experiment was confounded by not isolating variables.

16

Whether is is an accurate study or not, it is pretty entertaining. This is pretty funny: “There was only one answer: a randomised trial. I toyed with the idea of blinding it but, in the interest of self preservation and other road users, decided against it.”

But I have two questions.

  1. Was the gearing the same on both bikes?
  2. What would the numbers look like if he removed the two slowest and two fastest times from each bike? His fastest time was 1:37:40 on the steel frame chasing a faster cyclist and his slowest time 2:03:20 was in the snow on the carbon bike. What would the times look like if you removed the extremes?
17

i didn’t get my tri bike because it was lighter, i got it because:

  1. it looks nice
  2. the tri postion theoretically helps the run, i’m not a runner and i need all the help i can get

=)
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18

wonder why time trialists use the silly things

  1. the tri postion theoretically helps the run, i’m not a runner and i need al the help i can get

=)
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19

Now I have some thing to show my friends who insist on chopping off 300g for $1000+…

20

The world is coming to an end! I never thought I would see a white paper write up with confidence intervals and slopes and written like a medical paper for time savings and weight. I love it. I now need to read it for bias and interference and put some of my education to good use.