Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 02-08-07, 03:09 AM   #1
giskard
Senior Member
Thread Starter
 
Join Date: Jan 2007
Location: UK
Bikes: Kona Jake the Snake
Posts: 328
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Post pumps

I've already posted this in the Commuting thread (dunno why but there ya go) but didn't get any replies so I've re-posted here where it's probably more appropriate.

Anyway....

The 2007 range of higher-end Dahon folders include a BioLogic Zorin PostPump as standard, which seems like a great idea. I'm sure I've read somewhere that post pumps are not a good thing as the seat post is weakened. Is that the case?
I'm possibly going to buy a Dahon Mu P8 which (I think) has a BioLogic Zorin PostPump as standard so I'd like to know if here are any issues with this particular post pump and with post-pumps in general. Are there a number of manufacturers of post-pumps out there? A quick Google search seems to indicate just the one.

Cheers

Johno
giskard is offline   Reply With Quote
Old 02-08-07, 07:06 AM   #2
tellyho
Your mom
 
Join Date: Aug 2006
Bikes:
Posts: 2,541
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I don't even know what a post pump is.
tellyho is offline   Reply With Quote
Old 02-08-07, 07:22 AM   #3
waterrockets 
Making a kilometer blurry
 
waterrockets's Avatar
 
Join Date: May 2006
Location: Austin (near TX)
Bikes: rkwaki's porn collection
Posts: 26,130
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
He's talking about these:
http://www.dahon.com/technology/component/zorin.htm


I don't see why it would be any weaker than a normal seat post, but I have no experience with them.
waterrockets is offline   Reply With Quote
Old 02-08-07, 04:01 PM   #4
giskard
Senior Member
Thread Starter
 
Join Date: Jan 2007
Location: UK
Bikes: Kona Jake the Snake
Posts: 328
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
I don't even know what a post pump is.
No wonder I didn't get any feedback when I posted the same qustion in the Commuting forum!
giskard is offline   Reply With Quote
Old 02-08-07, 04:23 PM   #5
Moose
mousse de chocolat
 
Moose's Avatar
 
Join Date: Jul 2001
Location: Northeast Ohio, USA
Bikes: Masi Speciale Fixed, Fuji America Fixed, "Modernized" Gitane
Posts: 1,141
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
That looks pretty darn cool. Falls under the category of "Why didn't I think of that"

Most folders use long seatposts, these things may be too long for a regular bike, but I doubt they are weak.
Moose is offline   Reply With Quote
Old 02-08-07, 06:10 PM   #6
tellyho
Your mom
 
Join Date: Aug 2006
Bikes:
Posts: 2,541
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
That's wild! Can't imagine it would be detrimental to the structure of the seatpost. Get one so we all know how it goes!
tellyho is offline   Reply With Quote
Old 02-14-07, 07:45 AM   #7
giskard
Senior Member
Thread Starter
 
Join Date: Jan 2007
Location: UK
Bikes: Kona Jake the Snake
Posts: 328
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If I do go for the Dahon Mu P8 or any other bike that includes a Zorin Postpump as standard, I'll let you know how I get I get on with it and if it's any good.

Johno
giskard is offline   Reply With Quote
Old 02-14-07, 07:58 AM   #8
froze
Banned.
 
Join Date: Feb 2003
Location: Fort Wayne, Indiana
Bikes: 84 Trek 660 Suntour Superbe; 87 Giant Rincon Shimano XT; 07 Mercian Vincitore Campy Veloce
Posts: 4,762
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Why would you want a pump that you have to remove the seat post first to access it? Then have to make sure the seat is properly adjusted everytime you replace it. YUK! That's additional time, plus could eventually weaken and or strip the bolt if you accidently cross thread it while attempting to replace it then you will have to ride the bike while standing; plus the diameter of the pump to get it to fit inside the post has to be very small thus strength of the pump may not be very good. Personally I would hate that pump due to just the hassle of removing the seat post all the time just to fix a flat just for that problem alone.

Don't forget a lot of manufactures claim their pumps can reach X psi but in real life they all seem to be about 10 psi less then their claims.

If you want a small out of the way pump why not just a get a mini like the Torelli Aria which is the smallest and lightest pump on the market and still reach 90 to 100psi that attaches to the side of your water bottle cage with included brackets? These pumps use to come in different end caps colors, the one shown is black mine is yellow, not sure if other web or LBS bike stores have the other colors available, you would have to do a check. http://www.torelli.com/product_info....products_id=59
froze is offline   Reply With Quote
Old 02-14-07, 08:23 AM   #9
ollo_ollo
Senior Member
 
ollo_ollo's Avatar
 
Join Date: Nov 2003
Location: Near Sublimity Orygun
Bikes: Still have a few left!
Posts: 3,601
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
I would imagine any bike using this pump would have a quick release type seat clamp, but the criticism of the pump's efficiency due to a small diameter may be true.
ollo_ollo is offline   Reply With Quote
Old 02-15-07, 12:21 AM   #10
mtnbiker4791
Senior Member
 
Join Date: Dec 2006
Location: Aurora,CO
Bikes:
Posts: 298
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Seatpost pumps have been around for along time 20 + years. Had one about 20 years ago for my mtn bike it worked well. Cant remember the brand off hand right now.
mtnbiker4791 is offline   Reply With Quote
Old 02-15-07, 10:37 PM   #11
froze
Banned.
 
Join Date: Feb 2003
Location: Fort Wayne, Indiana
Bikes: 84 Trek 660 Suntour Superbe; 87 Giant Rincon Shimano XT; 07 Mercian Vincitore Campy Veloce
Posts: 4,762
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by mtnbiker4791
Seatpost pumps have been around for along time 20 + years. Had one about 20 years ago for my mtn bike it worked well. Cant remember the brand off hand right now.
That's strange...I'm not saying that to say your wrong; I mean that after 30 years of riding and 10 of those racing, I have never seen a seat post pump either on a bike or at an LBS, nor ever heard anyone mention it!!! I must be living in the Twilight Zone.
froze is offline   Reply With Quote
Old 02-15-07, 10:52 PM   #12
Quijibo187
Custom User Title
 
Quijibo187's Avatar
 
Join Date: Feb 2007
Location: Winnipeg, Canada
Bikes: 2006 Marin Stelvio, 1990s Steve Bauer, Marin Palisades Trail
Posts: 1,912
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by froze
That's strange...I'm not saying that to say your wrong; I mean that after 30 years of riding and 10 of those racing, I have never seen a seat post pump either on a bike or at an LBS, nor ever heard anyone mention it!!! I must be living in the Twilight Zone.
not that strange, you've probably never seen or heard of them because they often don't work well, so nobody wants/uses them. we have one in the basement of our shop, so I tested it out, it was very awkward to use and not as efficient as a dedicated pump.
Quijibo187 is offline   Reply With Quote
Old 02-15-07, 11:02 PM   #13
masiman
Senior Member
 
Join Date: Oct 2005
Bikes:
Posts: 1,735
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by froze
I have never seen a seat post pump either on a bike or at an LBS, nor ever heard anyone mention it!!! I must be living in the Twilight Zone.
There were always gadgety. Because they never performed well they never made it to wide distribution. I never saw one, but I remember a write up or ad for them some years ago.
masiman is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 08:57 PM.