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


Go Back   > >

General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

User Tag List

Reply
 
Thread Tools Search this Thread
Old 04-23-13, 02:01 PM   #1
NeoY2k
Senior Member
Thread Starter
 
Join Date: Jan 2012
Bikes:
Posts: 100
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
700c tube in a 650b tire?

Hi,

I am repairing an old bike for a friend, and would prefer repairing it with what I have in stock - partly cause I'd like to repair it tonight so she'll have it to ride tomorrow morning. And that I like repairing bikes while sipping a beer and chatting with friends.

This is a 650b tire, should be half ballon, but is slightly narrower, probably 32mm or 35mm.
I have 650b tubes, should be "half balloon", but they are 44-585, which is IMHO too wide.
The original tube was maybe half as wide (strange, but hey, better a small tube in a large tire).

I put that wide 650b tube in the tire, but the tire did not seat very happily. Pumped it, seemed ok, started to repair another bike... And heard a big "Boom" one hour later from the tire unseating and the tube exploding.

I was thinking that I also have 700c tubes in way narrower width. Would they be an ok match? I know 26" tubes can go in 650b, but I don't have anything slimmer than 36*1,75. Yet 26" is 559 mm so it actually is a tad smaller, might do the trick better, but it's schrader, not presta. And while I would drill a modern aluminum rim, I wouldn't do the same on an old steel one...

Any suggestion?

Also: the explosion damaged the tire bead. Some gum was scraped, but that is the gum that goes after the wire bead, of which the metal is not exposed. Do you think I have any chance putting that tire back in?

Thanks,
Nicolas
NeoY2k is offline   Reply With Quote
Old 04-23-13, 02:24 PM   #2
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 22,152
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 1132 Post(s)
There are widths in the 622/630 tubes , thin 23, med 32. wide 50, Aka 29er.

no visual inspections are possible in text only questions.

Last edited by fietsbob; 04-23-13 at 02:28 PM.
fietsbob is offline   Reply With Quote
Old 04-23-13, 05:23 PM   #3
ThermionicScott 
Gratuitous glib and snark
 
ThermionicScott's Avatar
 
Join Date: Aug 2011
Location: CID
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers)
Posts: 14,108
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 418 Post(s)
Unless you pinched the tube between the tire bead and rim, it sounds like you used too much pressure for a steel rim. I would use the 584-44 tube and put some air in it before mounting the second bead of the tire.
__________________
Quote:
Originally Posted by chandltp View Post
There's no such thing as too far.. just lack of time
RUSA #7498
ThermionicScott 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 09:25 AM.