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I definitely think that if I lost 100g off the tyres/ tubes I'd notice it more than if I left the bag of Haribo in my pocket at home.
IF accelerating/ decelerating a rotating object requires more effort if there is more mass at the edges of the object then it will make a difference as mountain biking requires a lot of accelerating and decelerating of the wheels.
stuff that you have no idea about, and looking silly.
take it easy chief.
But they are still rubber tubes, they will inevitably pick up more flats than UST.
But UST is heavy, people will be prepared to make that trade off, again I'll use the tub analogy - these are half the price of a reasonable tub, and should be more puncture resistant.
But they're an unknown quantity, you can't just say "they're worse than butyl tubes", you don't know! They've been making them for years, so they're obviously on to something! If you read the blurb they're tougher than a DH tube for thorn punctures, which probably makes them more puncture resistant than a lightweight tubeless tyre.
I wouldn't go back to UST again, Stan's conversions are vastly superior IMO.
From
http://commons.wikimedia.org/w/index.php?title=File%3ARolling_Racers_-_Moment_of_inertia.ogv
which is on the right of the page
http://en.wikipedia.org/wiki/Moment_of_inertia
[as I already stated]
"This final result reveals that the mass and radius of the object are irrelevant, and what determines the rate of acceleration is the geometric distribution of their mass, which is represented by the value of k. Additionally, we observe that objects with larger values of k will accelerate more slowly."
i.e. if you place the same mass on the outside of a wheel as on the body of non-rotating part [or in the very center, pretty much the same] it will have more effect on acceleration.
In other words, the tubes will reduce the F[orce] required to A[ccelerate] the total M[ass] of the bike and ride as the F is F=MA and the A is both the Linear and the Rotational Acceleration. The Rotational acceleration is a function if Rotational Inertia, which has a non-linear relationship with the distribution, and value of,the mass. It is infact GREATER than linear, buy a substantial margin, and so this is why the 100g saved, will reduce the total F required for a given A more in the location in the outside of the wheel/tyre than in the frame/rider/pies.
For my next trick I will prove Black=White and likely get killed on a zebra crossing.
Whatever you say Njee20 as long as it make you happy.
I'd rather buy those tubes than a top end cassette to be honest.
[url= http://www.chainreactioncycles.com/Models.aspx?ModelID=91007&gclid=CKz7iZblx7UCFZDKtAodWUcAAg ]http://www.chainreactioncycles.com/Models.aspx?ModelID=91007&gclid=CKz7iZblx7UCFZDKtAodWUcAAg[/url]
(I love that the 9 speed XT one I use is lighter than that anyway 🙄 )
Depending on where you're riding, tubes can last for years.
As soon as light, expensive components start getting spoken about, every quickly changes the topic to fat people and poo.
Whatever you say Njee20 as long as it make you happy.
It does! But why are you still here? I'm struggling with your useful contribution!?
Love that as soon as light, expensive components start getting spoken about, every quickly changes the topic to fat people and poo.
Indeed, and anything light = fragile and silly!
These [i]could [/i]be a step too far, but equally they could be rather good! IIRC the problems I've heard about are failures on the joins rather than 'normal' punctures.
I definitely think that if I lost 100g off the tyres/ tubes I'd notice it more than if I left the bag of Haribo in my pocket at home.
IF accelerating/ decelerating a rotating object requires more effort if there is more mass at the edges of the object then it will make a difference as mountain biking requires a lot of accelerating and decelerating of the wheels.
That 100g is 0.1% of the mass of a typical rider/bike combo. If it's all at the outer edge of the wheel then taking into account rotational inertia it means you'll accelerate 0.2% faster. I very much doubt you could notice 0.2% difference in acceleration in a proper double blind test (IIRC a difference has to be at least 5% for the average human to be able to detect it).
gofasterstripes - we're not disputing that rotational inertia of your wheels has an effect on how fast your bike accelerates, just that it's not 16x and whether it's actually at all significant.
aracer, not worth the bother, it clear is worth it to some folk. That 0.2% gain just turns you into wiggins. 😆
Hopefully common sense will prevail for the majority. Being STW i dont hold my breath.
So many ways of blowing £40 for far less savings. Titanium anything for a start, QRs/pedal axles/saddle rails/bolts.