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Old 07-25-09, 07:45 PM   #1
SesameCrunch
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Dahon quality - Rant!



I was on my Dahon Smoothhound today, in a "spirited" ride against a 17 yr old who was riding my Moulton TSR. It was going great, he's a very fit rider (less than 1/3 my age) and we were really pushing each other. About 8 miles into it, I ran over some glass which penetrated my Schwalbe Marathons (so much for kevlar protection ).

So, no problem, I have a spare tube and tools. And I have the handy-dandy, ballyhooed Dahon Biologic Seatpost Pump. Nifty pump built into the seatpost. I changed the tube and started to pump up the tire. It was then I discovered that the pump hose was friggin' cracked rendering the pump useless! This bike is two years old. I've used the pump maybe 3 times altogether. How the he!! could the thing be cracked!

Upon closer examination, the pump hose is made from some really cheap-ass, brittle plastic. Give me a friggin' break, Dahon! Your engineers come up with with this brilliant, probably trade-marked design, and you can't spend an extra $0.005 to make it with with a hose so the d@mn*d thing will last longer than 3 uses!

Idiocy like this just fries my @ss!
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Old 07-25-09, 10:19 PM   #2
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I will have to check my pump, I have never used it. Thanks for the heads up. Maybe we can come up with a better replacement part.
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Old 07-26-09, 09:40 AM   #3
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ummm... like dynocoaster I haven't have had cause to use mine. Ihope I never will, but on the other hand, I am just back from a tour where I had the sense of security of having a pump under my backside, so to speak. But it does need to be reliable, and now I guess I am going to have to carry a spare pump anyway. So why bother with the design complexity of a seatpost pump that has built in obsolecence ? On my Speed TR (which I do adore, I have to say) maybe I'll put a thudbuster post in...
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Old 07-26-09, 10:20 AM   #4
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Quote:
Originally Posted by SesameCrunch View Post


I was on my Dahon Smoothhound today, in a "spirited" ride against a 17 yr old who was riding my Moulton TSR. It was going great, he's a very fit rider (less than 1/3 my age) and we were really pushing each other. About 8 miles into it, I ran over some glass which penetrated my Schwalbe Marathons (so much for kevlar protection ).
I'm not sold on typical Kevlar protection either..

Quote:
Originally Posted by SesameCrunch View Post
So, no problem, I have a spare tube and tools. And I have the handy-dandy, ballyhooed Dahon Biologic Seatpost Pump. Nifty pump built into the seatpost. I changed the tube and started to pump up the tire. It was then I discovered that the pump hose was friggin' cracked rendering the pump useless! This bike is two years old. I've used the pump maybe 3 times altogether. How the he!! could the thing be cracked!

Upon closer examination, the pump hose is made from some really cheap-ass, brittle plastic. Give me a friggin' break, Dahon! Your engineers come up with with this brilliant, probably trade-marked design, and you can't spend an extra $0.005 to make it with with a hose so the d@mn*d thing will last longer than 3 uses!

Idiocy like this just fries my @ss!
Well, hopefully, the TSR30 was equipped with a working pump so you didn't have to walk home.. Just looked at my hose .. the pump post hose.. it is marked as 8x5 PolyUrethane tube.. it is also well lubricated with some sort of clear glop.... PolyUrethane should hold up pretty well.. is that what you have in yours?
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Old 07-26-09, 10:32 AM   #5
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Too bad about your pump - I've always thought that the idea of having a pump in the seat tube was a great idea. Can you put another pump in there?
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Old 07-26-09, 10:42 AM   #6
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SesameCrunch, You should also post your rant on the Dahon forum. They actually have a couple of company Dahonians that reply to issues like this. http://www.dahon.com/forum/index.php?act=idx
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Old 07-26-09, 10:55 AM   #7
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How about gutting the parts of the stock pump and using the space to store a small pump such as this one

http://www.lezyne.com/index.php/prod...oad-drive.html

(as well as patch kit, small tools and emergency money to take a taxi).

I wish I could do that with my Thudbaster.

Kam
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Old 07-26-09, 05:06 PM   #8
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Quote:
Originally Posted by BruceMetras View Post
Well, hopefully, the TSR30 was equipped with a working pump so you didn't have to walk home.. Just looked at my hose .. the pump post hose.. it is marked as 8x5 PolyUrethane tube.. it is also well lubricated with some sort of clear glop.... PolyUrethane should hold up pretty well.. is that what you have in yours?
Nope, I didn't take an extra pump on the TSR, because I figured I had the Dahon pump. I used my finger to cover the crack on the hose. Managed to get it pumped to a level where I could limp home.

I just looked at my hose, there's no markings of any kind on it. I wonder if it's a different year than yours. The hose is orange colored, is yours the same?

Also, no "goop" on mine. Is it a grease of some kind?

Quote:
Originally Posted by kingfish254 View Post
SesameCrunch, You should also post your rant on the Dahon forum. They actually have a couple of company Dahonians that reply to issues like this. http://www.dahon.com/forum/index.php?act=idx
Thanks for the tip. I may just do that.

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Too bad about your pump - I've always thought that the idea of having a pump in the seat tube was a great idea. Can you put another pump in there?
I have to see if I can figure out how to dismantle the pump. Maybe there's a diagram of the pump somewhere. Actually, if I can find a diagram, I could just replace the hose too.
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Old 07-27-09, 08:28 AM   #9
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hmmm I am not necessary a fan of gizmos, which are combining all kinds of things together, like a lamp/radio/inflator/car starter..... etc etc .... I always like a good radio a good battery starter a good light etc etc ....

having said that the pump has an orange polypropylene ( I think thats the word) tube, which is way way better than most tubes on even the more expensive shop floor pumps.... it is similar to the air hoses found in repair shops ( the ones which are curling up ) and can take 150 lbs of pressure all day long , being dragged over the floor etc etc .... .....

Its good that you post your trouble though, as I will look out extra for more cases ,, just in case this is a wider problem, in order to inform Dahon right away about a possible problem ... I am just a dealer, but I sure want to do my part to get all things Dahon right....

I fill my Dahon with the electric air pump I have at home.... or in the shop .... only once had to use the pump ( and it worked fine ..even one of the older ones which did not have the screw cap at the bottom)

Keep us posted ... also if you are able to replace the piece of hose in there ... etc

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Old 07-27-09, 08:42 AM   #10
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having said that the pump has an orange polypropylene ( I think thats the word) tube, which is way way better than most tubes on even the more expensive shop floor pumps.... it is similar to the air hoses found in repair shops ( the ones which are curling up ) and can take 150 lbs of pressure all day long , being dragged over the floor etc etc .... .....
Hmmm.... Both you and BruceMetras are saying that the hose material is high quality. You two know what you're talking about. It makes me wonder, then, why my hose was cracked???! Maybe just a one-of defect?
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Old 07-27-09, 08:56 AM   #11
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lol I cannot talk for Bruce...of course....
I sometimes THINK i know something.... lol ( which is really dangerous...lol )
I know about 3.2 % compared to the late Sheldon Brown

anyhow
lots and lots of pumps out there and I am sure we will see a few more people who will come out of the bushes now. I havent heard one complained abou t the tubing ...I did hear a lot of grief with the first generation without the screw cap.... where the handle was slipping out.... As far as I know the same tube was used at that time already ...

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Old 07-27-09, 08:57 AM   #12
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Originally Posted by SesameCrunch View Post
Hmmm.... Both you and BruceMetras are saying that the hose material is high quality. You two know what you're talking about. It makes me wonder, then, why my hose was cracked???! Maybe just a one-of defect?
My post/pump is from a 2009 Mu Uno, so there may have been a change in tube material from your earlier SmoothHound.. mine is orange also.. is the hose brittle, or did it split open at perhaps a gouge or other abrasion mark.. just curious .. I'd also hate if that scenario happened to me.. I use mine to top up the tires frequently because the bike often lives in a trunk.. let us know if you get it apart to install a new hose .. I'd take mine apart, but with my luck, I'd probably wreck it.. chin up, ever forward
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Old 07-27-09, 09:23 AM   #13
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Quote:
Originally Posted by SesameCrunch View Post
Nope, I didn't take an extra pump on the TSR, because I figured I had the Dahon pump. I used my finger to cover the crack on the hose. Managed to get it pumped to a level where I could limp home.

I have done a simular thing to put air in to a cycle when the bike pump adapter was lost. I used an adapter for a ball and made a hole in some bluetac and sealed it around the ball adapter and value whilst pressing the valve in with the ball adapter.
Amazingly it worked!
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Old 07-27-09, 11:39 AM   #14
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Originally Posted by SesameCrunch View Post


Upon closer examination, the pump hose is made from some really cheap-ass, brittle plastic. Give me a friggin' break, Dahon! Your engineers come up with with this brilliant, probably trade-marked design, and you can't spend an extra $0.005 to make it with with a hose so the d@mn*d thing will last longer than 3 uses!

Idiocy like this just fries my @ss!

So you walked home then......



Never saw you get mad before. LOL.





EDIT:

Ah - no - I see in a later post that you limped home. Reminds me of the reason why I changed the tyres on that tsr after its maiden ride. I ran over thorns three times in a few miles and the tyre was wrecked from getting it on and off. I walked the bike six miles back to the car in serious disgust.

I have just the same kind of problem now on my old merc pump. The hose leaks where the connector is crimped onto the tube. I carry a small pocket pump if I venture further from home than I am prepared to walk. It doesn't have a hose, but just clamps directly onto the valve. I think with that pump it is important when using it to support the valve end carefully in the palm of your hand so as not to put a lot of force on the valve. Lots of flexion there might tear the valve from the tube perhaps.

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Old 07-27-09, 12:47 PM   #15
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Quote:
Originally Posted by BruceMetras View Post
My post/pump is from a 2009 Mu Uno,
WHAT!!!! Screw the pump discussion, let's hear the details about the UNO, man!!!!

You are the folderitis king. Hands down winner, no contest!!!....
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Old 07-27-09, 12:49 PM   #16
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Never saw you get mad before. LOL.
Heh, heh. 4 years on this forum. I don't think I've ever vented like this.


Feels kinda good.....
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Old 07-27-09, 12:54 PM   #17
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.. is the hose brittle, or did it split open at perhaps a gouge or other abrasion mark.. just curious ..
There were cracks (0.5 to 1 cm long) at both ends of the hose. Then end near the nozzle was completely cracked through and that's where the air leaked out. The end attached to the body of the pump has cracks, but had not fully compromised the hose yet.
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Old 07-27-09, 05:40 PM   #18
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... I fill my Dahon with the electric air pump I have at home....
What kind of electric air pump do you use?
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Old 07-27-09, 07:04 PM   #19
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WHAT!!!! Screw the pump discussion, let's hear the details about the UNO, man!!!!

You are the folderitis king. Hands down winner, no contest!!!....
Compared to likes of the great SesameCrunch, I am but a lowly minnow in a sea of sharks.
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Old 07-27-09, 07:07 PM   #20
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http://www.walmart.com/catalog/produ...uct_id=9189093

this one .... :-)
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Old 07-27-09, 08:44 PM   #21
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I have had the compressor in the Thumbnail for a couple of years. It is 1.5 GAL and 150 psi. Good for car and truck tires and other compressor needs, but I found it was not so good for bikes (even with Schrader valves ).
I recently bought this one:
http://www.lowes.com/lowes/lkn?actio...3078-70-ASI300
It is both 120V AC and 12V DC, and it shuts off at the pre-set pressure. It is much simpler for me to use.
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Old 07-27-09, 09:11 PM   #22
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Heh, heh. 4 years on this forum. I don't think I've ever vented like this.


Feels kinda good.....
I was a little surprised as well.
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Old 07-27-09, 09:48 PM   #23
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I was a little surprised as well.
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