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 08-18-12, 08:00 PM   #1
whitestroke
Junior Member
Thread Starter
 
Join Date: Aug 2012
Bikes:
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Crazy looking tire valve or no valve.

What's with this tire valve, and how is there air in the tire? Just purchased bike and noticed the fill valve is gone. Yes, this is the only hole in the rim, and I see no where to fill the tire with air. Seems to be about 25lbs. of air in tire.

Attached Images
File Type: jpg 100_5452.jpg (92.3 KB, 119 views)
whitestroke is offline   Reply With Quote
Old 08-18-12, 08:06 PM   #2
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 29,668
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 221 Post(s)
My first instinct was that someone broke off the valve when pumping it up, but since you feel some pressure, that's ruled out.

Likely this is one of those foam filled tires that get introduced as the latest and greatest every few years. You'll know for sure if you remove the tire and the tube feels like Italian sausage. If you can get it apart, you can replace the tube and be good to go, but know in advance that it's really hard removing these types of tires.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 08-18-12, 08:37 PM   #3
LarDasse74
Guest
 
Join Date: Jul 2008
Location: Grid Reference, SK
Bikes: I never learned to ride a bike. It is my deepest shame.
Posts: 3,769
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My first guess is also that it is a non-pneumatic (foam filled) tire. I have never heard many good things about those - high drag and they feel weird... maybe they'd be appropriate for very short rides like for getting around in a warehouse or something, but most consider occasional flat tire repairs to the price of riding a bicycle.

it also might be that the stem was pushed in and is stuck inside, perhaps rotated to some location in the rim away from the valve hole caused by riding with low tire pressure. But I have never seen this happen that I can recall.
LarDasse74 is offline   Reply With Quote
Old 08-18-12, 11:24 PM   #4
whitestroke
Junior Member
Thread Starter
 
Join Date: Aug 2012
Bikes:
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Foam filled ! That would explain it. Rides pretty good for no air!
whitestroke is offline   Reply With Quote
Old 08-19-12, 05:43 AM   #5
Kimmo
bike whisperer
 
Kimmo's Avatar
 
Join Date: Dec 2009
Location: Melbourne, Oz
Bikes: copy/paste links: http://velospace.org/node/36949 http://velospace.org/node/47746 http://velospace.org/node/47747
Posts: 7,099
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Well, it appears to have SS spokes at least... or are they chromed?

Quote:
Originally Posted by FBinNY View Post
know in advance that it's really hard removing these types of tires.
Depends whether you want to keep the tyre
Kimmo is offline   Reply With Quote
Old 08-19-12, 02:25 PM   #6
dabac
Senior Member
 
Join Date: Mar 2008
Bikes:
Posts: 5,421
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Quote:
Originally Posted by LarDasse74 View Post
My first guess is also that it is a non-pneumatic (foam filled) tire. I have never heard many good things about those - high drag and they feel weird...
Well, there are tire inserts, and "solid" tires. The tires aren't foam filled as such, they're made out of the same foamed polyurethane throughout.
I've logged plenty of miles on such tires. On decent roads they're a non-issue entirely. On cobbles and when crossing lane markers at a shallow angle, they're a little squirrely, but nothing critical. There's a lot more shock transfer, so you get an immense rattle every time you go off a curb or so.

If you're riding on decent roads, and is used to 5+ bar pressures anyhow, the biggest issue I can think of is to figure out which tire and pressure equivalent to go for. No margin for adjustment after the purchase.

I wanted to try inserts made for sports wheel chairs, but the guys wouldn't sell me any, claiming that they were "too hard for bike use". Obviously absolutely clueless to what regular road bike pressures are.
dabac is offline   Reply With Quote
Old 08-19-12, 08:44 PM   #7
whitestroke
Junior Member
Thread Starter
 
Join Date: Aug 2012
Bikes:
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
These must be the tire inserts because the tires say 45 to 65 psi. The front tire has a tube and the rear has the insert. If I squeeze them they feel very similar.
Attached Images
File Type: jpg 100_5454.jpg (100.6 KB, 15 views)
whitestroke is offline   Reply With Quote
Old 08-19-12, 09:28 PM   #8
AlphaDogg
I let the dogs out
 
AlphaDogg's Avatar
 
Join Date: Apr 2011
Location: Boulder, CO
Bikes: 2011 Fuji Roubaix 1.0, 2003 Ti Merlin Solis, & 1994 Raleigh MT200
Posts: 1,934
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have a crazy idea. Take a needle and poke the tire. If it deflates, then it's a pneumatic tire, and you need to replace the tube. If it doesn't deflate, then it's one of those foam filled ones.
AlphaDogg is offline   Reply With Quote
Old 08-19-12, 10:53 PM   #9
whitestroke
Junior Member
Thread Starter
 
Join Date: Aug 2012
Bikes:
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by AlphaDogg View Post
I have a crazy idea. Take a needle and poke the tire. If it deflates, then it's a pneumatic tire, and you need to replace the tube. If it doesn't deflate, then it's one of those foam filled ones.
Sounds like fun but I need it to get to work tomorrow. If It still doesn't need air in 6 months, I guess I'll just ride it till I'm on the rim.
whitestroke 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 04:26 PM.