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 10-04-09, 09:13 PM   #1
toyotaboy
Member
Thread Starter
 
toyotaboy's Avatar
 
Join Date: Oct 2009
Location: LITH, IL
Bikes: trek 930
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
newbie derailleur question

I've got a Trek 930, it's been rock solid for probably 10 years. Starting to get chain slip, so I took it into a shop, and they told me the derailleur was bent so they bent it back the best they could (and told me it probably needed to be replaced soon). Wish they had told me that before I picked it up because I probably would have opted to just replace it, because after about 2 rides the problem is back.

So here's my question, I'd rather not pay retail pricing for a new derailleur (I'll still have them install it), but I'm clueless if there's any difference between them. All I know about my derailleur is that it's 1:1 actuation ratio and that it's direct mount (not a hanger). Are there different spur gear teeth or is that standard? (I would think different teeth count would affect the chain). I'd appreciate any response.
toyotaboy is offline   Reply With Quote
Old 10-04-09, 09:18 PM   #2
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If it's 1:1, it's SRAM. It should say that on the derailleur itself.
operator is offline   Reply With Quote
Old 10-04-09, 09:21 PM   #3
toyotaboy
Member
Thread Starter
 
toyotaboy's Avatar
 
Join Date: Oct 2009
Location: LITH, IL
Bikes: trek 930
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yes 1:1 on derailleur

Thanks for the quick response!
toyotaboy is offline   Reply With Quote
Old 10-07-09, 10:06 PM   #4
toyotaboy
Member
Thread Starter
 
toyotaboy's Avatar
 
Join Date: Oct 2009
Location: LITH, IL
Bikes: trek 930
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
3 more questions:
* Do I want long, medium, or short cage?
* Do the amount of teeth matter on the cogs, or no because the pitch is the same on all of them?

Started looking at some derailleurs, and noticed on mine it has a 3rd screw that pushes against the frame as another adjustment, not sure if that's common?
toyotaboy is offline   Reply With Quote
Old 10-07-09, 10:16 PM   #5
Panthers007
Great State of Varmint
 
Panthers007's Avatar
 
Join Date: Sep 2008
Location: Dante's Third Ring
Bikes:
Posts: 7,479
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What size - medium, long...- do you need? What is the size of your cassette in the rear? How many cogs and the number of teeth on the largest (lowest gear) cog? Cassettes are measured as being 5-speed (5-cogs) at 12-28. Or 7-speed @ 12 - 32, etc. You should count them and give us the numbers of the speeds (cogs) and the sizes (number of teeth) from smallest to largest.

The size differential and number will determine the best derailleur to use in your application.
Panthers007 is offline   Reply With Quote
Old 10-07-09, 10:42 PM   #6
LesterOfPuppets
cowboy, steel horse, etc
 
LesterOfPuppets's Avatar
 
Join Date: Sep 2008
Location: Rock Springs, WY
Bikes: My War
Posts: 26,481
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 58 Post(s)
Chainring count and teeth counts are also important when choosing derailer model and cage length.
LesterOfPuppets 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 10:53 PM.