Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5
  1. #1
    Erect member since 1953 cccorlew's Avatar
    Join Date
    Dec 2006
    Location
    Antioch, CA (SF Bay Area)
    My Bikes
    Roubaix Expert, Motobecane Fantom Outlaw turned commuter, Cannondale F500 Mtn bike, Some old French thing gone fixie
    Posts
    6,466
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    changing sprockets on shimano cassette

    Just how freely can I change sprockets on an Ultegra 10-speed cassette?
    I have a 11-23 I'd like to
    toss out the 11 and 12
    get a 12 that goes in position 1
    add a 25 on top

    Shimano makes this configuration, but rather than buy it, can I just add those two sprockets?

    Or
    make a 13-25 (again, Shimano makes this configuration) buy getting a 13- tooth 1st position, adding in an 18 and adding a 25 on top?

    I guess I'm asking, do all the sprockets come apart, or are some stuck together. If they are stuck together, how can I find which ones are? Is there a set of rules somewhere?
    WANTED: Not a darn thing. I've got it all. Life is good.
    Website at curtis.corlew.com Bicycle blog at ccorlew.blogspot.com

  2. #2
    Senior Member
    Join Date
    May 2006
    Location
    Denver, CO
    Posts
    751
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The three largest cogs are mounted to a common carrier so you'll have to replace them all at once.

  3. #3
    Gone, but not forgotten Sheldon Brown's Avatar
    Join Date
    Jul 2002
    Location
    Newtonville, Massachusetts
    My Bikes
    See: http://sheldonbrown.org/bicycles
    Posts
    2,301
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by cccorlew
    Just how freely can I change sprockets on an Ultegra 10-speed cassette?
    I have a 11-23 I'd like to
    toss out the 11 and 12
    get a 12 that goes in position 1
    add a 25 on top
    Actually, the 25 would have to go on the bottom! ;-)

    Unfortunately, it won't, 'cause the bottom sprocket needs to have a recess to fit over the hub.

    This approach worked great with 7-, 8- & 9-speed systems, but not with 10-speed.

    Generally with Ultegra the 3 biggest sprockets are on a spider unit. Other ones are sometimes rivetted in pairs, but can often be separated. The smaller ones are always separate.

    Sheldon "Custom Cassettes" Brown
    [COLOR=blue][CENTER][b]Harris Cyclery, West Newton, Massachusetts[/b]
    Phone 617-244-9772, FAX 617-244-1041
    [URL= http://harriscyclery.com] http://harriscyclery.com[/URL]
    Hard-to-find parts shipped Worldwide
    [URL=http://captainbike.com]http://captainbike.com[/URL]
    Useful articles about bicycles and cycling
    [URL=http://sheldonbrown.com]http://sheldonbrown.com[/URL] [/CENTER] [/COLOR]

  4. #4
    Erect member since 1953 cccorlew's Avatar
    Join Date
    Dec 2006
    Location
    Antioch, CA (SF Bay Area)
    My Bikes
    Roubaix Expert, Motobecane Fantom Outlaw turned commuter, Cannondale F500 Mtn bike, Some old French thing gone fixie
    Posts
    6,466
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Sheldon Brown
    Actually, the 25 would have to go on the bottom! ;-)

    Unfortunately, it won't, 'cause the bottom sprocket needs to have a recess to fit over the hub.

    This approach worked great with 7-, 8- & 9-speed systems, but not with 10-speed.

    Generally with Ultegra the 3 biggest sprockets are on a spider unit. Other ones are sometimes rivetted in pairs, but can often be separated. The smaller ones are always separate.

    Sheldon "Custom Cassettes" Brown
    Thanks for the help. Does this then add up to: "You just have to buy a new 12-26 cassette and there is no way to recycle most your 11-23 so you can save a few bucks" ??

    And, just for educational purposes, are you saying that my 23 tooth sprocket has a recess and is different than a 23 tooth that's justy inside a 26 tooth?
    WANTED: Not a darn thing. I've got it all. Life is good.
    Website at curtis.corlew.com Bicycle blog at ccorlew.blogspot.com

  5. #5
    Erect member since 1953 cccorlew's Avatar
    Join Date
    Dec 2006
    Location
    Antioch, CA (SF Bay Area)
    My Bikes
    Roubaix Expert, Motobecane Fantom Outlaw turned commuter, Cannondale F500 Mtn bike, Some old French thing gone fixie
    Posts
    6,466
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Whoops. I think I found some info at
    http://cycle.shimano-eu.com/media/te...9830608752.pdf
    that helps me understand all this weirdness...
    WANTED: Not a darn thing. I've got it all. Life is good.
    Website at curtis.corlew.com Bicycle blog at ccorlew.blogspot.com

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •