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 06-25-02, 06:54 AM   #1
WoodyUpstate
xc AND road
Thread Starter
 
WoodyUpstate's Avatar
 
Join Date: May 2002
Location: Upstate NY
Bikes:
Posts: 503
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Dropping Chain

The last few rides I've had some problems dropping the chain when shifting down to the small ring. The limit screw is correctly adjusted and the bike shifts fine, front and rear, under all other circumstances.

It seems to happen under load, at higher RPM and when the drivetrain may need some lube - at the end of a ride.

Other than making sure the chain is properly lubed, are there any other suggestions? The chain has 755.5 miles on it since new.
WoodyUpstate is offline   Reply With Quote
Old 06-25-02, 08:14 AM   #2
Precision Pedal
Just Pedal
 
Join Date: Jun 2002
Bikes:
Posts: 153
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Chain Suck!!
Precision Pedal is offline   Reply With Quote
Old 06-25-02, 09:28 AM   #3
KleinMp99
New to bikeforýms.net
 
Join Date: Jan 2001
Bikes:
Posts: 2,202
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally posted by Precision Pedal
Chain Suck!!
O that really helps dosent it!

Woody.....your sure that the front derailleur is adjusted properly??? If it happens under load, then dont shift under load??
KleinMp99 is offline   Reply With Quote
Old 06-25-02, 09:40 AM   #4
Precision Pedal
Just Pedal
 
Join Date: Jun 2002
Bikes:
Posts: 153
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Klein,
Isn't your response similar to the "Doc my arm hurts when i do this" joke? Chain suck defined:
http://fagan.co.za/Bikes/Csuck/
Precision Pedal is offline   Reply With Quote
Old 06-25-02, 10:34 AM   #5
roadbuzz
Just ride.
 
roadbuzz's Avatar
 
Join Date: Oct 2000
Location: C-ville, Va
Bikes:
Posts: 3,246
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Is there pattern w/regard to which rear cog you're on when it happens?
roadbuzz is offline   Reply With Quote
Old 06-25-02, 10:55 AM   #6
SteveE
Veni, Vidi, Vomiti
 
SteveE's Avatar
 
Join Date: Jun 2002
Location: Republic of Anaerobia
Bikes: Serotta Legend Ti, Romani Columbus SL, Soma Doublecross
Posts: 3,582
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It sounds like the chain is flopping past the small chainring and falling off between the small chainring and the frame. Is that right?

Check the alignment of the front derailleur. The chain sounds like it's pretty new but you might want to check the length as maybe it's too loose.
SteveE is offline   Reply With Quote
Old 06-25-02, 11:52 AM   #7
WoodyUpstate
xc AND road
Thread Starter
 
WoodyUpstate's Avatar
 
Join Date: May 2002
Location: Upstate NY
Bikes:
Posts: 503
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally posted by roadbuzz
Is there pattern w/regard to which rear cog you're on when it happens?
I haven't noticed if the problem is associated with a particular cog, but I'm usually motoring along. I'd say it happens in the middle cogs, let's say 3-4-5.

I've watched it happen. It just shoots right past the lower ring. Since I had just put new cables on it, I attributed the problem to a stretched cable and out-of-adjustment low limit screw. I tightened the cable and adjusted the limit screw. It's better, but it still shot off last night.

I suppose I should mention it's an Ultegra double drivetrain.
WoodyUpstate is offline   Reply With Quote
Old 06-25-02, 07:29 PM   #8
roadbuzz
Just ride.
 
roadbuzz's Avatar
 
Join Date: Oct 2000
Location: C-ville, Va
Bikes:
Posts: 3,246
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My Ultegra double would occasionally jump the small ring. I adjusted it so there's a slight front der rub when I'm in the 39 and the next-to-smallest cog (a combination I don't have to use).
roadbuzz is offline   Reply With Quote
Old 06-25-02, 10:45 PM   #9
pat5319
Senior Member
 
pat5319's Avatar
 
Join Date: Sep 2000
Location: Spokane WA
Bikes: Seven Axiom Ti, Trek 620, Masi cylocross (steel). Masi Souleville 8spd, Fat Chance Mtn (steel), Scwinn Triple Bar cruiser, Mazi Speciale Fix/single, Scwinn Typhonn
Posts: 1,141
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Get yourself one of those chaindrop blockers that attatch to the seat tube, end of story. The pros use 'em!!!

Ride Better
Pat
pat5319 is offline   Reply With Quote
Old 06-26-02, 06:25 AM   #10
WoodyUpstate
xc AND road
Thread Starter
 
WoodyUpstate's Avatar
 
Join Date: May 2002
Location: Upstate NY
Bikes:
Posts: 503
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Before my ride last night I cleaned the chain and gave it two coats of lube, working the first in before applying the second. Then I tried to throw the chain during the ride. All was well and the chain didn't drop.

Previously, I had done a couple of rides in the rain and I suspect the chain was stiff and under lubed. Road grime and water had scoured the lube away, and I didn't lube enough after each wet ride.
WoodyUpstate 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 10:03 PM.