Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Cassette & Upper Cage Pulley Too Close

Notices
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.

Cassette & Upper Cage Pulley Too Close

Old 05-19-14, 05:38 PM
  #1  
Member
Thread Starter
 
Join Date: Apr 2014
Posts: 30
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Cassette & Upper Cage Pulley Too Close

After replacing a 12-30T Tiagra Cassette Today with An Ultegra 12-30T, I Noticed A Clanging Noise When The Chain Was In The 30T Cog & The 39T Small Chain Ring On The Crank. Note: A few weeks ago, I had a LBS Change The Crank From A 50/34 Compact Crank To The 53/39 Crank. I "could of" Had This Problem Since Then, I just Noticed It Today, When They Swapped Out Cranks, The Chain Was NOT Replaced. I'm Running A Shimano 105 Short Cage. When I Look At The Top Pulley & The 30T Cog, They Are Over Lapping, Or Over Meshing. Once I Shift Over To The Large Chain Ring, The Tension Pulls The Pulley Away From The 30T Cog. I am wandering If My Chain Is Now Incorrect... See Pics Below... THANKS.
Attached Images
File Type: jpg
IMG_1882.jpg (98.1 KB, 27 views)
Bradwallace is offline  
Old 05-19-14, 05:42 PM
  #2  
Member
Thread Starter
 
Join Date: Apr 2014
Posts: 30
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Second Pic
Attached Images
File Type: jpg
IMG_1883.jpg (99.4 KB, 18 views)
Bradwallace is offline  
Old 05-19-14, 05:50 PM
  #3  
Great State of Varmint
 
Panthers007's Avatar
 
Join Date: Sep 2008
Location: Dante's Third Ring
Posts: 7,476
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 15 Times in 15 Posts
Please shift your gears to small-to-small and take a picture showing the back part of the bike. I want to see the rear wheel and the entire RD and cassette. In other words - shift so the chain is on the smallest cog of the cassette and the small chain-ring of the crank.

Can't really tell from that close-up.
Panthers007 is offline  
Old 05-19-14, 05:57 PM
  #4  
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,909

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5891 Post(s)
Liked 2,745 Times in 1,532 Posts
Try a quick experiment. Pull the lower loop forward and see if that brings the upper pulley lower as the cage rotates. If so, the solution lies in either the B-screw adjustment or adjusting the chain length (subject to an absolute minimum based on big/big +1").

Shimano and Campagnolo derailleurs are sensitive to chain length because the cage pivots between the pulleys, causing the height of the upper pulley to change with cage angle. Shimano's detailed instructions cover this with a reminder to check the chain length and "B" screw adjustment in all gears.

Sram RDs are insensitive to chain length since the cage pivots through the upper pulley. That's why Sram can advise setting chain length to the minimum as determined by the big/big + 1" method without any other considerations.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

Just because I'm tired of arguing, doesn't mean you're right.

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 05-19-14, 06:12 PM
  #5  
Member
Thread Starter
 
Join Date: Apr 2014
Posts: 30
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Rear pics
Attached Images
File Type: jpg
IMG_1890.jpg (87.2 KB, 22 views)
File Type: jpg
IMG_1894.jpg (95.6 KB, 21 views)
Bradwallace is offline  
Old 05-19-14, 06:17 PM
  #6  
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,909

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5891 Post(s)
Liked 2,745 Times in 1,532 Posts
Did you try pulling the lower loop forward?

If it helped, shift to the big/big combination and pull the lower loop forward to see if shortening the chain is an option. If it is, therein lies the solution.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

Just because I'm tired of arguing, doesn't mean you're right.

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 05-19-14, 06:20 PM
  #7  
Member
Thread Starter
 
Join Date: Apr 2014
Posts: 30
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
FBinNY: I Pulled Lower Loop Forward.... Upper Pulley "Gained" Distance - Clearance. I went Big to Big... I may be able to remove one link... If I can have "more" spring forward, I could remove more than one link.

Last edited by Bradwallace; 05-19-14 at 06:31 PM.
Bradwallace is offline  
Old 05-19-14, 06:55 PM
  #8  
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,909

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5891 Post(s)
Liked 2,745 Times in 1,532 Posts
One other consideration.

You're running a short cage derailleur which typically has a capacity of 27 teeth or so (didn't look it up, left that to you), with a combination that calls for a take up of 32t. (18+14). There's usually some fudge room and you might get it to work with very careful balance of chain length and B-screw setting, but you're pushing the limits and may not succeed.

One trick you might try if you're right on the edge, is to use a larger pulley in the lower position. This incrases the take up capacity by a tooth or so, and if you're right at the edge might do the trick.

Otherwise, the easy answer is a medium cage RD, which has far more latitude.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

Just because I'm tired of arguing, doesn't mean you're right.

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 05-19-14, 08:15 PM
  #9  
Great State of Varmint
 
Panthers007's Avatar
 
Join Date: Sep 2008
Location: Dante's Third Ring
Posts: 7,476
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 15 Times in 15 Posts
Originally Posted by FBinNY
One other consideration.



Otherwise, the easy answer is a medium cage RD, which has far more latitude.
I agree with all FB has stated. And using a short-cage RD with a 32T cog? I hope you can get by with just pulling a link. But I'm skeptical. Please let us know what transpires.

Good luck!
Panthers007 is offline  
Old 05-19-14, 08:42 PM
  #10  
Member
Thread Starter
 
Join Date: Apr 2014
Posts: 30
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
It's a 30t cog, not 32t the bike came from Trek with a 12-30 cassette, I just changed out the crank from compact to standard, as stated above.
Bradwallace is offline  
Old 05-19-14, 08:45 PM
  #11  
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,909

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5891 Post(s)
Liked 2,745 Times in 1,532 Posts
Originally Posted by Bradwallace
It's a 30t cog, not 32t
Yes, it's a 3t0 sprocket, but a 12-30 combined with 39-53 = 18+14 = 32 teeth take up capacity required, 5 more than the 27t? capacity of the RD.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

Just because I'm tired of arguing, doesn't mean you're right.

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 05-19-14, 08:45 PM
  #12  
Great State of Varmint
 
Panthers007's Avatar
 
Join Date: Sep 2008
Location: Dante's Third Ring
Posts: 7,476
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 15 Times in 15 Posts
Originally Posted by Bradwallace
It's a 30t cog, not 32t the bike came from Trek with a 12-30 cassette, I just changed out the crank from compact to standard, as stated above.
Mea culpa. It still may present a problem. I love good, short-cage RD's. But only when I'm running 26T cog on my road-bike.
Panthers007 is offline  
Old 05-22-14, 09:27 AM
  #13  
Member
Thread Starter
 
Join Date: Apr 2014
Posts: 30
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
B screw fixed problem. But, I'm throwing a 105 compact crank back on the bike.
Bradwallace is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
xenologer
Bicycle Mechanics
19
12-18-16 09:18 AM
Brewsmith
Bicycle Mechanics
3
09-10-15 04:02 PM
Mark9
Bicycle Mechanics
18
10-16-14 06:15 PM
balindamood
Bicycle Mechanics
3
05-14-14 12:26 AM
Chalupa102
Bicycle Mechanics
21
06-07-10 03:29 PM

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.