Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    USAC/CBR Cat 3 OCshark's Avatar
    Join Date
    May 2008
    Location
    SoCal
    My Bikes
    1999 RoadShark (LandShark)
    Posts
    280
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    12-23 and 12-27 cassettes with out re-adjustment possible?

    I've got a 12-23 Dura Ace (CS-7700) on an Easton EA90 SL rear wheel. The shifting was perfect to begin with. I put an Ultegra 12-27 (CS-6500) on my Velomax R1 rear wheel. The shifting was immediately rough and I was not able to shift it into the lowest gear (the 27). I tried playing with the rear barrel adjuster to no avail. I put my Easton back on, and got the shifting to about 95% the smoothness it had previously been it set at. I'm at a loss as to how to get these two sets of gears working without having to mess with the alignment.

    Is this even possible?
    RadSport Cycling Team | Cat 2-O-Meter: 0%

  2. #2
    Senior Member Bill Kapaun's Avatar
    Join Date
    Feb 2007
    Location
    Mid Willamette Valley, Orygun
    My Bikes
    86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
    Posts
    6,927
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    9 speed and 10 speed cassettes are spaced differently between cog centers, thus the shifter moves the chain over a different amount per shift.
    You use 9 speed shifters for 9 speed cassettes and 10 speed shifters for 10 speed cassette.

    Your chain may have also been too short, if it was properly adjusted for the 12-23, but that's not the major issue.

  3. #3
    Senior Member capwater's Avatar
    Join Date
    Dec 2004
    Location
    Quahog, RI
    My Bikes
    Giant TCR Comps, Cdale R5000, Klein Q-Pro, Litespeed Siena, Piasano 105, Redline Conquest Pro, Voodoo Bizango, Fuji Aloha
    Posts
    1,509
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Bill Kapaun View Post
    9 speed and 10 speed cassettes are spaced differently between cog centers, thus the shifter moves the chain over a different amount per shift.
    You use 9 speed shifters for 9 speed cassettes and 10 speed shifters for 10 speed cassette.

    Your chain may have also been too short, if it was properly adjusted for the 12-23, but that's not the major issue.
    Both cassettes are 9 speed (CS-7700 is DA, CS-6500 is Ultegra) so that isn't the issue, since they use the same overall width and same spacing shifting should be the same regardless of cog tooth numbers. The 27 shouldn't really matter over the 23 so long as the chain is properly sized. Also check your B screw adjustment, could be hindering jumping up to the top cog.

  4. #4
    In beaurocratic limbo urbanknight's Avatar
    Join Date
    Mar 2006
    Location
    Los Angeles, CA
    My Bikes
    Specialized Allez, K2 Razorback
    Posts
    22,457
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If the B adjustment screw doesn't work (90% sure that's it, though) you might need a shim/spacer on the Easton wheels. I think that's the brand I've heard seems to line up cassettes a little differently than most other hubs.
    "Well, I guess you can cut the arts as much as you want... Sooner or later, these kids aren't going to have anything to read or write about." (Richard Dreyfus as Glenn Holland)

  5. #5
    USAC/CBR Cat 3 OCshark's Avatar
    Join Date
    May 2008
    Location
    SoCal
    My Bikes
    1999 RoadShark (LandShark)
    Posts
    280
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Luckily, my mechanic is in today, so he'll dial in the wheels. I am guessing the spacing is slightly off between the two cassettes, which, if that's the case, he'll know what to do. Hopefully he can teach me his secret to dialing in these things. Seems I just can't get the technique perfected. I'll post back what he does for the benefit of others who run into this problem...
    RadSport Cycling Team | Cat 2-O-Meter: 0%

  6. #6
    Packfodding 3 caloso's Avatar
    Join Date
    Jul 2002
    Location
    Sacramento, California, USA
    My Bikes
    Ridley Excalibur, Gazelle Champion Mondial, On-One Pompino, Specialized Rock Hopper
    Posts
    29,668
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    B-screw.
    Cyclists of the world, unite! You have nothing to lube but your chains!

  7. #7
    USAC/CBR Cat 3 OCshark's Avatar
    Join Date
    May 2008
    Location
    SoCal
    My Bikes
    1999 RoadShark (LandShark)
    Posts
    280
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Ok just got back; the problem is not spacing between the cogs, rather the entire cluster is offset about 1mm different than the other. So we just need 1 mm washer to shift the whole thing over. He didn't have the right size in stock, but once he gets it in stock, he said it would fix the problem. He's a pro mechanic and deals with these kinds of issues all the time.
    RadSport Cycling Team | Cat 2-O-Meter: 0%

Posting Permissions

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