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 08-28-12, 09:46 PM   #1
Hendo252 
Senior Member
Thread Starter
 
Join Date: Feb 2012
Location: SoCal
Bikes: 1983 Trek 620, 2010 Roubaix
Posts: 371
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Inner spacer required for Ultegra Cassette on Shimano hub?

Greetings.

I'm installing a new Ultegra CS-6700 12-30t cassette onto a Shimano R-500 wheel.

The cassette is packaged with a 1mm inner spacer that fits between the cassette and the freehub.

The CS-6700 installation instructions have a somewhat cryptic note that "If using a special freewheel, a spacer is not required" but it doesn't give any information about what a "special" freewheel means in this context. <and yes, they use the term "Freewheel" not "Freehub">

Here's a link to the installation instructions; see the gray box on the LH side of the page:
http://tinyurl.com/9qa7j2x

The previous cassette was a Shimano 5600 12-25t, and it had the spacer installed but since I bought this bike used I have no idea about its prior history.

So I originally installed it with the spacer since there was one installed behind the old cassette, and since there didn't seem to be anything "special" about the freehub. It all seems to fit, but clearance between the chainstay and chain on the 12t inner cog is none too large and I thought it would be prudent to see what y'all think.

The bike is a new-to-me 2009 Specialized Roubaix (stealth gloat) and the drive train is Ultegra 6700/6703 triple, if that makes a difference.

Thanks in advance for your help!

-Tom in SoCal

Last edited by Hendo252; 08-28-12 at 09:58 PM. Reason: Typo corrected
Hendo252 is offline   Reply With Quote
Old 08-28-12, 10:20 PM   #2
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
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
Posts: 29,662
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 218 Post(s)
Don't try to remember whether each particular combination needs an extra spacer behind the cassette or not.

Instead remember why you'd need a spacer and you'll know whether or not to use on for any combination.

The lockring is supposed to compress the cassette and lock it place. For that to happen the cassette must overhang the front of the freehub body by 1mm or so. Otherwise the lockring will bottom out on the freehub body instead of the cassette. It's the same logic as why the stem and spacers must stack up above the top of the steerer for the top cap to adjust the headset.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“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   Reply With Quote
Old 08-28-12, 11:22 PM   #3
Hendo252 
Senior Member
Thread Starter
 
Join Date: Feb 2012
Location: SoCal
Bikes: 1983 Trek 620, 2010 Roubaix
Posts: 371
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks FB -- that makes all kinds of sense.

Thanks for this advice, and all your contributions to the board.

-Tom in SoCal
Hendo252 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 09:25 PM.