it doesn't, at least, not when pressurized and not significantly.
re: Boyle's law


Using lighter solid and liquid objects is better, because they don't compress.
latex tubes, for instance, while vain, do lighten the bike by an insignificant amount.

I assumed he was trolling. No one ever seriously suggests helium in tires. Obviously because hydrogen is superior.

the 631 sputniks are plenty light. change wheels only and i think you will be amazed.

i have essentially a bare frame '07 53cm, built with a woundup fork (heavy, as carbon goes) / cane creek volos wheels (lightish, but not ultralight) / campy carbon road crank / aluminum contact points / front brake, and it's ~17.5lbs. i'm (very) happy the way it is and have no plans to change anything, but if i were to weight weenie it i think it could be 16lbs for sure.

you're friend knows what i do: this is a fantastic frame, well worthy of a better build.

wait a minute. if your shoes are connected to the cranks and are going round and round with the cranks I'm thinking shoe weight has the same impact as crank weight.

You have 25 lbs to carry 5 miles ... what would you prefer - to have it in the backpack or just in the form of wrapped package..?

P.S. I ordered Kilo Pro and Wabi wheelset. I will tell in a week how worthy it was.

Sure you can lose weight at the crankset. Just depends on how bold you want to get with the Dremel.

The shoes are non-rotational weight, and not considered to be part of a bike it's apparel.

After reading all this I told my wife this evening that I will take this on as a project, meaning I will work at reducing the Jamis Sputnik to a weight under 17 pounds. I plan to take my time because I want to shop for the best price I can for the lighter components (read: E-Bay). Of course the lighter components must also be safe and reliable.

I will begin with the stem, post, handlebar, water bottle holders etc. The wheels will always be the main focus. I know my friend spent almost $800.00 for his wheels. I do not plan to spend that much, so it may take a while to find the right wheels at a price I will pay.

This may be interesting, and I am sure the bike will be fun to ride after it is done.

no, no, no...

wheels.

if you want a different bike, buy wheels. buy that other stuff to correct fit, but don't expect it to make the bike feel any different otherwise.

for less than half what your friend spent you can have significantly improved wheels, and i promise you it's the right move. do it now, or kick yourself later when you do because that internet guy was right. 1600g or less...you'll love it.

Why did you ask us for advice only to dismiss it? lol

You don't have to spend $800 on wheels to have a light set.

I'd go for an all carbon fork or carbon fork with steel steerer first, if it had an all steel fork.

Either that, or I'd go for wheels first.

stem, post and bars, unless they are hunks of junk, don't save much weight. Even the mediocre, entry level stuff from the brands you see on road bikes aren't that much heavier than their higher end counterparts.

One word: Drillium

that seatpost is insane.

You made a wrong ass choice.

I can't find it right now, but there is an image of that seatpost cleanly snapped off at the track.

no doubt.

You're in the wrong forum, go here:https://www.bikeforums.net/showthread...bike-on-a-diet

Just by looking at the spec sheet I bet you could do this:

• Remove freewheel
• Remove flat/track pedals and replace with clipless
• Replace fork with carbon variant
• Remove rear brake, cable clips, and lever
• Replace tires with a 23c model
• Get a decent wheelset with low-flange hubs

And be at weight for under $400, conservatively.

But, I'm sure your way will be more work and much more expensive. Good luck!

second that wheel set makes the biggest difference. depending on your weight, you can get away with lighter parts. I ride a 14 lb bike and the only really crazy light thing on it is the wheelset

light stuff is pointless. you can probably lose five whole pounds from yourself pretty easily.

Thats what I said! But there is a catch. Muscle is heavier than fat. Thus when you go from fat ass to fit ass: your weight might go up. I apologize in advance: I do not mean to pick on half of the forum participants.

even if you increase your mass instead of just cutting, eliminating fat for muscle will increase your power and probably your power to weight.

Taking about losing weight instead of making bike lighter is trolling and not relevant at all...

five pounds is five pounds. it could cost $1000 plus or $0.

time is money

true. make sure to set your metabolism to medium high before you head to the office.