Bike Forums - 2.25 pounds -- Noticeable?

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- - 2.25 pounds -- Noticeable? (https://www.bikeforums.net/fifty-plus-50/710198-2-25-pounds-noticeable.html)

ThatBritBloke

01-30-11 08:18 AM

Back in the day the maxim was "an ounce off the wheel is worth two off the frame".

JanMM

01-30-11 09:07 AM

Quote:

Originally Posted by Pat (Post 12153295)

The problem is that when we ride a bike with less weight we KNOW it. So it is hard to control for the placebo effect. That is the bike is lighter and therefore it will be better. It is hard to even figure a way to do it without going to some sort of outlandish lengths or having a bike mechanic friend with a warped sense of humor.

Hard to analyze the results in a detached scientific manner after we have put time/money/effort into a bike. If our expectation is that a change we make will result in improved performance, then it is very difficult to not perceive that expected improvement.

I would be open to having someone secretly replace the cro-mo frame of my 30 lb. bike with the titanium version, to see if I could perceive any difference.

bobbycorno

01-31-11 10:22 AM

Quote:

Originally Posted by BikeWNC (Post 12152442)

Given the same rider, he will be faster on a climb on a lighter bike. That's not misinformation, it's physics.

Faster, yes. Measurably faster, probably not. Do the physics.

SP
Bend, OR

BikeWNC

01-31-11 10:41 AM

Quote:

Originally Posted by bobbycorno (Post 12158508)

Faster, yes. Measurably faster, probably not. Do the physics.

SP
Bend, OR

That depends on what you consider measureable. 30 seconds on a long climb is still 30 seconds. If that means I can ride with the group without extra work on my part that's great. You might not care.

http://www.analyticcycling.com/Force...ight_Page.html

Don in Austin

01-31-11 10:59 AM

Quote:

Originally Posted by doctor j (Post 12152157)

I'll say it's real. When I carry my bike down the stairs before a ride, I notice the difference in weight with and without filled water bottles.

Sure, the weight of the water bottles is a significant percentage of the weight of your bike alone. But it is a much smaller percentage of the combined weight of bike + rider. Bike + rider is what matters and what you have to lift up a hill. Twenty pound bike, water bottle adds 10% to weight of bike. Bike with 180 pound rider, water bottle adds 1% to the number that matters.

Don in Austin

Don in Austin

01-31-11 11:14 AM

Quote:

Originally Posted by ThatBritBloke (Post 12153322)

Back in the day the maxim was "an ounce off the wheel is worth two off the frame".

This is true when accelerating due to a "flywheel" effect of rotating mass. lf your are laboring up a hill at constant speed, an ounce off the wheel = an ounce off the frame exactly. This is basic physics.

Don in Austin

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