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 Post subject: 21 Gram Pump
PostPosted: Tue Dec 31, 2013 6:35 am 
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Joined: Fri Jun 01, 2012 11:45 am
Posts: 83
Location: Bristol, UK
http://www.bikerumor.com/2013/12/31/kic ... bike-pump/

$80 and only takes 100 pumps :shock:


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 Post subject: 21 Gram Pump
Posted: Tue Dec 31, 2013 6:35 am 


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 Post subject: Re: 21 Gram Pump
PostPosted: Tue Dec 31, 2013 8:46 am 
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Joined: Sat Dec 06, 2008 10:14 am
Posts: 963
Location: Sweden
If that tiny thing can reach 150psi I'll eat my entire bike for breakfast. Very much doubt it would ever even get close to 80psi... And even that would be more than a 100 strokes. At one or another point, it just boiles down to the laws and limitations of physics...

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Last edited by DMF on Fri May 16, 2014 9:26 am, edited 2 times in total.

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 Post subject: Re: 21 Gram Pump
PostPosted: Tue Dec 31, 2013 6:47 pm 
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Joined: Thu Jan 08, 2004 10:11 pm
Posts: 730
If they had claimed 100psi, I would have given them the benefit of doubt. But claiming 150psi is just rediculous. There is no way that little thing can reach 150psi.


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 Post subject: Re: 21 Gram Pump
PostPosted: Tue Dec 31, 2013 7:36 pm 
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Joined: Wed Oct 31, 2007 10:32 pm
Posts: 7412
Location: Los Angeles / Glendale, California
I'm also calling bullshit on the claim.
I tried out the Airbone Supernova pump. It too claimed high PSI, and only weighs 59g, and it's damn small.
The highest I could ever get it was 70 PSI. That was after more than 500 pump strokes. They have a video which "shows" the pump getting up to 120psi... which most likely is a video where the tyre was pumped with a floor pump, then switched over to the Airbone for display purposes.

Ah, the power of video editing.

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 Post subject: Re: 21 Gram Pump
PostPosted: Wed Jan 01, 2014 1:00 am 
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Joined: Tue Sep 28, 2010 5:13 pm
Posts: 44
Location: BC, Canada
It is quite possible to reach 150 psi with the iPump; the fork/shock pumps are very small and can reach twice that pressure - http://www.topeak.com/products/Pumps/PocketShockDXG. The question is how many thousand strokes you need in order to get to 150 psi.


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 Post subject: Re: 21 Gram Pump
PostPosted: Wed Jan 01, 2014 4:08 am 
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Joined: Thu Feb 24, 2011 6:33 pm
Posts: 300
Location: California
My Lezyne Road Drive has served me well over almost the fours years since I got it. It weighs 92g, takes less than 200 pumps to get ~100psi (about 2-3 minutes), screw on or slip mode protects valve damage, fits in back pocket, < $50usd, and pays for itself after the first couple flats. At one point I was considering a frame pump because of how much easier and faster it is to get up to pressure, but I might just save that idea for when I get vintage steel frame or something. My personal optimal tire pressure is between 100-110 psi and I get so few flats anyways (I know *knocks wood*) that the convenience/weight ratio is negligible between a frame pump and a good quality high-pressure mini-pump like the Road Drive.

edit: to reply to the topic specifically, I'm not sure if the light weight of the IPump would outweigh having to pump for 5+ minutes. I doubt it would be easy to get to over 100psi with such small pump volume, and that kickstarter 'video' that has a still photo of a dismembered hand holding the pump doesn't exactly convince me. :noidea:

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 Post subject: Re: 21 Gram Pump
PostPosted: Sun Jan 19, 2014 8:05 am 
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Joined: Mon Jan 06, 2014 4:30 am
Posts: 51
DMF wrote:
If that tiny thing can reach 150psi I'll eat my entire bike for breakfast. Very much doubt it would ever even get close to 80psi... And even that would be more than a 100 strokes. At one or another point, it just boiles down to the laws and limitations of physics...


I agree, there is no way known that will reach 150psi in 100, its just simply physics, total volume multiplied by number of strokes.

Cheers baz


Sent from my iPad using Tapatalk


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 Post subject: Re: 21 Gram Pump
PostPosted: Mon Jan 20, 2014 2:22 pm 
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Joined: Fri Apr 12, 2013 1:19 pm
Posts: 448
Location: SW England
But a CO2 can weighs 17g...

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 Post subject: Re: 21 Gram Pump
PostPosted: Mon Jan 20, 2014 2:42 pm 
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Joined: Sat Dec 06, 2008 10:14 am
Posts: 963
Location: Sweden
Ehm, no it doesn't?

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 Post subject: Re: 21 Gram Pump
PostPosted: Mon Jan 20, 2014 2:54 pm 
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Joined: Mon Jan 20, 2014 2:49 pm
Posts: 8
Was i really the only one noticing this?
Quote:
A flexible 100m hose makes it easy to reach even the trickiest of valve stems without accidentally breaking a presta head off.

If it weighs 21 grams and yet has a 100 m hose i will buy it immediately!


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 Post subject: Re: 21 Gram Pump
PostPosted: Mon Jan 20, 2014 3:06 pm 
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Joined: Sat Apr 22, 2006 12:38 am
Posts: 1744
Location: Dutchess County, NY
Devon wrote:
But a CO2 can weighs 17g...



16g cartridge is 57-60g on my scale

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 Post subject: Re: 21 Gram Pump
PostPosted: Mon Jan 20, 2014 11:03 pm 
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Joined: Thu May 04, 2006 4:43 pm
Posts: 5096
Location: Wherever there's a mountain beckoning to be climbed
rbynck wrote:
Was i really the only one noticing this?
Quote:
A flexible 100m hose makes it easy to reach even the trickiest of valve stems without accidentally breaking a presta head off.

If it weighs 21 grams and yet has a 100 m hose i will buy it immediately!
Well, that is obviously a typo and is supposed to be 100 mm (i.e. 10 cm).

On the other hand, maybe "the carbon bodied pump can inflate tires up to 150psi/11 bar" is also a typo, and is supposed to be "the carbon bodied pump can inflate tires up to 15psi/1.1 bar". That would at least be more in accordance with the laws of physics than the laws of marketing/hyped investment schemes.


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 Post subject: Re: 21 Gram Pump
PostPosted: Tue Jan 21, 2014 8:26 pm 
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Joined: Fri Apr 29, 2011 5:40 pm
Posts: 16
I was an original backer on kickstarter for this pump. I'll post a review as soon as it arrives.


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 Post subject: Re: 21 Gram Pump
PostPosted: Tue Jan 21, 2014 9:04 pm 
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Joined: Sat Aug 29, 2009 4:30 pm
Posts: 1568
Image
I calculate that it will require 103 strokes for a 700 x 23 clincher at sea level.


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 Post subject: Re: 21 Gram Pump
Posted: Tue Jan 21, 2014 9:04 pm 


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 Post subject: Re: 21 Gram Pump
PostPosted: Mon Mar 24, 2014 4:59 pm 
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Joined: Sun Mar 23, 2014 2:41 pm
Posts: 11
I also ordered one, and had a personal contact to Morris Ostrow, the inventer.
He is a nice guy, as i think. But i hope that he will also send the product. I am waiting and impatient.

timj, did you get your product yet?
I didn't :-(

to be honest, i don't expect a lot of this pump, it is more a "wannahave" gadget. and for me it is an emergency solution only, i use to take an adapter with me (2g) to pump my presta valve tubes at gas stations. so the pump must only be good enough to bring me to the next gas station.

At the moment i use the Barbieri Nana (30g).
on this pump i really missed a hose, or any kind of fix connection to the valve. the rubber gasket is worn out too fast, in my case usually after 5 uses or so. (do i do something wrong with it ?!?)


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