Go Back  Bike Forums > Bike Forums > General Cycling Discussion
Reload this Page >

Double Crank... First Timer

Notices
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!

Double Crank... First Timer

Old 10-20-05, 09:54 AM
  #1  
mooklekloon
Senior Member
Thread Starter
 
Join Date: Sep 2005
Location: Toronto, Ontario
Posts: 124
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Double Crank... First Timer

I just picked up a new specialized sirrus elite, and I have never ridden a double chainring bike before (only triple MTBs). I have a few questions... firstly, the front shifter has three "clicks" available, I only use the tighest two and the bottom one just slacks the cable because the FD is already agianst the lower limit stop. Is this normal?

Also, I can hit about 4-5 cogs on my 8-spd cassette without chainrub on the FD. Obviously, the 4-5 largest cogs when on the small ring, and the 4-5 smallest cogs when on the large ring. Again, is this normal?

I appreciate any help. Thanks so much.
mooklekloon is offline  
Old 10-20-05, 12:14 PM
  #2  
Leisesturm
Senior Member
 
Join Date: Jul 2005
Posts: 4,598
Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 1658 Post(s)
Liked 219 Times in 169 Posts
I have the highest regard for Specialized bicycles. I owned a Rockhopper back in the day. That was before index shifters but I would think that they would know better than to put a three ring shifter on a two ring bike. Possibly it is hard finding two ring shifters these days like it is hard finding mice that fit serial ports. But yes, if the shifter had three positions the only way to keep the FD from shifting the chain off on the inside would be to use the low limit stop adjustment as appears has been done.

Different FD's have different profiles and will rub in different places. Rub after 5 cogs is possible. I understand some FD shifters have 'trim' adjustments for that reason. You might want to go back to your dealer and resolve any issues.

H
Leisesturm is offline  
Old 10-21-05, 10:33 AM
  #3  
mooklekloon
Senior Member
Thread Starter
 
Join Date: Sep 2005
Location: Toronto, Ontario
Posts: 124
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I was thinking of adjusting it so that the loosest tension would have it resting on the lower limit stop and let me use the small chainring with the bigger cogs. Then the second index would move the FD a little to let me use the small ring and the smaller cogs. Then the third index would push the chain up to the larger ring and let me use the smaller cogs. Does this make sense? The idea is that I would have two small ring positions for the FD so I could go through the whole cassette. Anyone ever tried this?
mooklekloon is offline  
Old 10-21-05, 10:40 AM
  #4  
roadfix
hello
 
roadfix's Avatar
 
Join Date: May 2003
Location: Los Angeles
Posts: 18,602
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 162 Post(s)
Likes: 0
Liked 22 Times in 13 Posts
You can take up a little of the FD cable slack by tweeking your barrel adjuster. Otherwise, your first click on your shifter is useless.

Last edited by roadfix; 10-23-05 at 05:24 PM.
roadfix is offline  
Old 10-23-05, 01:07 PM
  #5  
grolby
Senior Member
 
grolby's Avatar
 
Join Date: Jan 2005
Location: BOSTON BABY
Posts: 9,685
Mentioned: 27 Post(s)
Tagged: 0 Thread(s)
Quoted: 254 Post(s)
Liked 35 Times in 21 Posts
Originally Posted by mooklekloon
I was thinking of adjusting it so that the loosest tension would have it resting on the lower limit stop and let me use the small chainring with the bigger cogs. Then the second index would move the FD a little to let me use the small ring and the smaller cogs. Then the third index would push the chain up to the larger ring and let me use the smaller cogs. Does this make sense? The idea is that I would have two small ring positions for the FD so I could go through the whole cassette. Anyone ever tried this?
With indexed front shifting, each indexing stop is going to move the FD too far to be used for trimming. It's also just plain inadvisable to use the small chainring with the smallest cog or two, partly because it'll wear out your chain and cogs much faster, and partly because it just isn't a very efficient gear to pedal in. I would just leave things as they are.
grolby is offline  
Old 10-23-05, 03:27 PM
  #6  
CommuterRun
Conservative Hippie
 
Join Date: Mar 2005
Location: Wakulla Co. FL
Posts: 4,271
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by mooklekloon
I was thinking of adjusting it so that the loosest tension would have it resting on the lower limit stop and let me use the small chainring with the bigger cogs. Then the second index would move the FD a little to let me use the small ring and the smaller cogs. Then the third index would push the chain up to the larger ring and let me use the smaller cogs. Does this make sense? The idea is that I would have two small ring positions for the FD so I could go through the whole cassette. Anyone ever tried this?
This sounds to me like the way it's supposed to be set up with the middle stop used as a trim stop. You could probably also adjust it so you can use the entire cassette on the large chainring. Did you get an owner's manual with the bike? If so check and see what it says. If you got the bike from a local bike shop Leisesturm has a good idea in taking it back and ask them.

There are also some good wrenches over in the Bicycle Mechanics section, if you haven't already posed this question to them.
CommuterRun is offline  
Old 10-23-05, 05:19 PM
  #7  
Mentor58
'Mizer Cats are INSANE
 
Mentor58's Avatar
 
Join Date: May 2005
Location: Clarksville, TN
Posts: 808

Bikes: C-dale T800

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by grolby
With indexed front shifting, each indexing stop is going to move the FD too far to be used for trimming. It's also just plain inadvisable to use the small chainring with the smallest cog or two, partly because it'll wear out your chain and cogs much faster, and partly because it just isn't a very efficient gear to pedal in. I would just leave things as they are.
I don't believe that is exactly correct. The purpose of that intermediate click is to allow for trimming of the FD. The cable shouldn't be loose when it's sitting on the lower limit screw. A trip over to the
Park Tools website will get you squared away like a cube. If you follow the directions there to the letter and do it step by step you will be rewarded with a system that will work as designed. If all else fails, you LBS can adjust them for you, but it's a good place to start doing repairs.

grolby is correct in that you shouldn't ride cross-chained (big / big or Small/Small). It puts additional stress on the chain, and generally not a good idea.

Steve W.
Who hates a poorly adjusted bike
Mentor58 is offline  

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.