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.

Reply
 
Thread Tools Search this Thread
Old 11-21-07, 03:10 PM   #1
neb
Junior Member
Thread Starter
 
Join Date: Nov 2007
Bikes:
Posts: 12
Tire lull

I recently got a new pair of Continental Ultra Sport tires and MEC tubes-- cheap, I know, and maybe this is the problem, but I thought I'd ask anyway.

I put them on my bike, and immediately noticed a low point on my front tire-- I could feel the whole bike thump every revolution. I took it off and reinstalled it, and it went away.

Meanwhile, I have since changed the rear tube (I think I might have pinched it), and now the replacement has the same lull. In terms of speed and performance, there isn't too much difference. It's not rubbing on anything, there are no leaks; I just think that I'm putting the tire on wrong, somehow. These are my first 700c tires-- I have several bikes, but they are all late-70's or early 80's models, and so have 27-inch tires, and I've never had a problem like this with them.

Are there any secrets or tricks that I ought to know? I feel like all my problems with them stem from some ignorance on my part. The rims are brand new 700cs and hand-tuned by my LBS, so I know they aren't the problem.

Thanks!
neb is offline   Reply With Quote
Old 11-21-07, 03:33 PM   #2
a77impala
a77impala
 
a77impala's Avatar
 
Join Date: Oct 2005
Location: Western South Dakota
Bikes:
Posts: 1,457
It sounds like your tire isn't mounted correctly on the rim. Make sure tire is equal all the way around rim. If you find a spot where side of tire is further in rim than normal just let enough air out to pinch sidewall together, maybe spray soapy water between rim and sidewall to let is seat correctly.
I have had this problem as well and it has always been tire not mounted right.
a77impala is offline   Reply With Quote
Old 11-21-07, 06:57 PM   #3
kenhill3
use your best eye
 
kenhill3's Avatar
 
Join Date: Mar 2006
Location: Olympia, Washington
Bikes: '75 Bertin, '93 Parkpre Team 925, '04 Kona King Kikapu, '05 Bianchi Vigorelli
Posts: 3,058
Quote:
Originally Posted by a77impala View Post
It sounds like your tire isn't mounted correctly on the rim. Make sure tire is equal all the way around rim. If you find a spot where side of tire is further in rim than normal just let enough air out to pinch sidewall together, maybe spray soapy water between rim and sidewall to let is seat correctly.
I have had this problem as well and it has always been tire not mounted right.
+1. You can check this after mounting and minimum inflation by looking at the raised line(s) molded into the sidewall of the tire. Look at the distance between this line and the edge of the rim all the way around for any inconsistencies. If you see such, go around the tire again and wiggle it back and forth to seat it. When it looks good, slowly inflate while checking the distance again periodically.
__________________
"I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.
kenhill3 is offline   Reply With Quote
Old 11-24-07, 09:43 PM   #4
neb
Junior Member
Thread Starter
 
Join Date: Nov 2007
Bikes:
Posts: 12
Thanks!

Totally worked.
neb 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 09:04 PM.