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

What kinds of Shimano Dura Ace and Ultegra Cassette Cogs do I have????

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.

What kinds of Shimano Dura Ace and Ultegra Cassette Cogs do I have????

Old 07-29-14, 11:41 AM
Thread Starter
Join Date: Jul 2014
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
What kinds of Shimano Dura Ace and Ultegra Cassette Cogs do I have????

I have a lot of new or pull off cogs from Shimano Dura Ace and/or Ultegra from cassettes.

Thing is that I cannot tell which type of cassette they belong to.

Any way to know what kind of Dura Ace or Ultegra cogs I have?
6xxx or 7xxx??
The colors of the cogs vary too...brown to grey to polished.
Any significance or way to determine category by this?

I found this link....
Shimano date codes
Is this accurate for two letter stamps found near the center of the cogs?

Thanks in advance.
spinderello is offline  
Old 07-29-14, 11:51 AM
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 36,948

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: 132 Post(s)
Tagged: 1 Thread(s)
Quoted: 4890 Post(s)
Liked 948 Times in 566 Posts
To my knowledge Dura and Ultegra cogs of the same year are identical dimensionally, and vary cosmetically only (also maybe in the specific metal allow and heat treat), and so you should have no problem matching up sets. (if they look the same they are, if not they may still be.

Note that in both series, all the sprockets are stamped, except for the smallest and possibly the 2nd which are machined from bar. That may cause some difference in the finish or shine, but nothing else.
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 online now  
Old 07-29-14, 06:51 PM
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,545

Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 1969 Post(s)
Likes: 0
Liked 983 Times in 678 Posts
As FB noted, for a given number of "speeds", almost all Shimano cogs including 105, Ultegra and Dura Ace cogs and spacers are interchangeable. What must match is the number of speeds (e.g. 8,9, etc.) the cogs are made for since as the number increased, the cogs got thinner as did the spacers.
HillRider is offline  
Old 07-29-14, 07:28 PM
Super Moderator
Homebrew01's Avatar
Join Date: Jul 2004
Location: Ffld Cnty Connecticut
Posts: 21,771

Bikes: Old Steelies I made, Old Cannondales

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 1142 Post(s)
Liked 748 Times in 504 Posts
Aren't some Dura-Ace cogs made from titanium ?? Magnet test ?
Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike.

FYI: https://www.bikeforums.net/forum-sugg...ad-please.html
Homebrew01 is offline  
Old 07-29-14, 07:29 PM
Senior Member
Join Date: Feb 2005
Location: Oklahoma
Posts: 9,438

Bikes: Trek 5500, Colnago C-50

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 5 Times in 4 Posts
Generally Ultegra cogs are shinier than D-A. In my experience Ultegra cogs are all steel. The larger D-A cogs are titanium and much lighter in weight. Check with a magnet, titanium is non-magnetic. Most of my experience has been with 9-speed cogs.
Al1943 is offline  
Old 07-30-14, 07:52 AM
bike whisperer
Kimmo's Avatar
Join Date: Dec 2009
Location: Melbourne, Oz
Posts: 9,480

Bikes: https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=152015&p=1404231

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1493 Post(s)
Liked 700 Times in 495 Posts
What's the deal, you have a whole bunch of loose cogs floating around in a box or whatevs and you need to sort them?

Or do you have complete cassettes that just need identifying?

Posting pics would help a hell of a lot.

Originally Posted by spinderello View Post
Is this accurate for two letter stamps found near the center of the cogs?
Pretty sure the letters on cogs refer to the cogs they belong next to.

For instance, a 15t might be made to go between a 14t and a 17t, or between a 14t and a 16t; the shift gates are different for each. IIRC chainrings are similar but just with a single letter, eg A, B, C, or D for road rings, or Z, X, Y for MTB stuff, denoting which set they're from.
Kimmo is offline  
Related Topics
Thread Starter
Last Post
Road Cycling
11-08-18 10:56 AM
Classic and Vintage Sales
03-30-18 06:47 AM
General Cycling Discussion
03-01-16 08:24 AM
Road Cycling
07-29-14 11:42 AM

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 or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.