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 03-17-03, 07:15 PM   #1
Phatman
Senior Member
Thread Starter
 
Join Date: Sep 2002
Location: NC
Bikes:
Posts: 3,411
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
chainline? I think

I bought a new lemond Alpe d'huez this weekend. (pics will be up shortly) I really like it, beleive it or not, the ride is actually SMOOTHER then my touring bianchi! Anyway, the drivetrain is a bit loud. It is a double, and when in the big ring, I can access all of the rear cogs (9-is a 105) without noise, but in the little ring, which is what I ride 90% of the time, I can only get to the second or third from the smallest cog without a grinding sound from the BB/front derailler. I realize that i shouldn't be doing this, as it causes unneccesary drivetrain wear, but I would prefer to just go through the 9 gears in the back before I go to the big ring. seems that it would be easier.

The bike has about 50 miles on it, and it didn't have this problem on the test rides i did (two 30 minute rides-I had a hard choice whether steel of aluminum, but in the end, steel is real ) How long do you think it will take the cables to stretch? is it possible that this is what is happening?
Phatman is offline   Reply With Quote
Old 03-17-03, 07:44 PM   #2
moabrider47
I ride a REAL Schwinn!
 
Join Date: May 2002
Location: NH, USA
Bikes: Lemond Nevada City (stock), '00 Schwinn Moab 3 (very upgraded)
Posts: 607
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Sounds like you might just need some front derrailleur adjustment. The sound is probably coming from the chain rubbing the front derrailleur. After 50 miles of shifting, the cables should have set. It's a fairly simple adjustment that can be done quickly at your LBS (You just bought it - they'll probably do it for free) or on your own. If you don't know how, Sheldon Brown's site or nearly any basic mechanics book should explain it well enough. On one bike, I can't completely eliminate chain rub on the front derrailleur while in the extreme combos, but it is very light, and I tend to avoid these combos anyways. Good luck!

-Moab

EDIT: If you're bike is this new, you should be due for a free LBS tuneup in a short amount of time anyways.
moabrider47 is offline   Reply With Quote
Old 03-18-03, 09:02 PM   #3
John E
feros ferio
 
John E's Avatar
 
Join Date: Jul 2000
Location: www.ci.encinitas.ca.us
Bikes: 1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
Posts: 17,314
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 141 Post(s)
Is the chain rubbing on the outer chainring or on the derailleur cage? I hate indexing of front derailleurs because it can preclude proper centering of the cage over the chain.

You should indeed avoid riding in the small-small combination(s), because this will greatly accelerate chain and cog wear. You will also find that there is a fair amount of ratio range overlap between your two chainrings, such that small-small corresponds to something like large-middle, e.g., 39/12 falls between 53/17 and 53/16.
__________________
"Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1981 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
John E is offline   Reply With Quote
Old 03-24-03, 02:18 PM   #4
RainmanP
Mr. Cellophane
 
RainmanP's Avatar
 
Join Date: Nov 2000
Location: New Orleans, LA
Bikes:
Posts: 3,037
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You may have noticed that your left shifter has an extra click, ie 3 clicks for only two chainrings. That extra click is for for "trimming" the derailleur. If the chain is rubbing give one click on the appropriate lever to move the der just enough to get it away from the chain. If the der wants to go ahead and shift when you do this, try making this click without pedalling. This should fix you up.
__________________
If it ain't broke, mess with it anyway!
RainmanP is offline   Reply With Quote
Old 03-24-03, 05:29 PM   #5
Phatman
Senior Member
Thread Starter
 
Join Date: Sep 2002
Location: NC
Bikes:
Posts: 3,411
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
no offense, but I actually hadn't noticed the extra click...
Phatman is offline   Reply With Quote
Old 03-25-03, 07:24 AM   #6
RainmanP
Mr. Cellophane
 
RainmanP's Avatar
 
Join Date: Nov 2000
Location: New Orleans, LA
Bikes:
Posts: 3,037
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally posted by Phatman
no offense, but I actually hadn't noticed the extra click...
Did it seem to do the trick?
__________________
If it ain't broke, mess with it anyway!
RainmanP is offline   Reply With Quote
Old 03-26-03, 02:10 PM   #7
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)
If you're running a 53X39 set-up, the chain will rub on the TEETH of the 53 ring when the chain is running on the outermost cogs of the cassette, ( there's no way around it). You'll have to get used to using the "Big" ring for taller gears.

( I didn't notice mine at first either)

Ride Fast
Pat
pat5319 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 10:44 PM.