Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    Senior Member due ruote's Avatar
    Join Date
    Dec 2006
    Posts
    4,303
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)

    Uniglide 6 > Hyperglide 7

    I recently picked up a 1988 Stumpjumper (discussed in this thread) that has a 6 speed Uniglide hub. If I'm reading my Sheldon correctly, I should be able to transplant a Hyperglide body onto the hub. I'd like to run a 7 speed cassette. Am I likely to be able to do that with the existing Deore derailleur and index shifters, or will I need to either change derailleurs or run friction?

    The specs for the bike are here.

  2. #2
    nice idea, poor execution
    Join Date
    Oct 2009
    Location
    West Newton, MA
    Posts
    397
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You can use the shifters you have if you run them in friction mode, and the derailleur will be fine either way. 7 speed indexed thumb shifters from that era are pretty expensive used, but Shimano makes "top mount" 7 speed and Rapidfire shifters that would work fine.

    I think http://www.flickr.com/photos/4476256...58140/sizes/l/ is the correct spec sheet for that hub, if so the 7 speed HG body will work fine.
    Kevin Duffy, Harris Cyclery, West Newton, MA.
    blog.harriscyclery.com

  3. #3
    Senior Member due ruote's Avatar
    Join Date
    Dec 2006
    Posts
    4,303
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by helicomatic View Post
    You can use the shifters you have if you run them in friction mode, and the derailleur will be fine either way. 7 speed indexed thumb shifters from that era are pretty expensive used, but Shimano makes "top mount" 7 speed and Rapidfire shifters that would work fine.

    I think http://www.flickr.com/photos/4476256...58140/sizes/l/ is the correct spec sheet for that hub, if so the 7 speed HG body will work fine.
    Thanks for that picture. It sounds like you're saying the 6 speed shifters won't index for 7 speeds, which I sort of expected. I'm a friction guy, so this is new territory for me.

  4. #4
    Senior Member
    Join Date
    Oct 2003
    Posts
    565
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    They might index. My 7-speed Deore XT shifters have an extra click in them, which I've never used on an 8-speed cassette so can't be certain that it would shift it correctly, but I recall reading that some people have used this on 8-speeds with no problems.

    Perhaps your 6-speed shifters might have an extra click too?

  5. #5
    ish
    ish is offline
    Senior Member
    Join Date
    May 2009
    Posts
    209
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    6 speed thumbies have an extra click, but I've read that 6 Shimano speed cog spacing is different than 7 speed spacing.

  6. #6
    Senior Member Tunnelrat81's Avatar
    Join Date
    Jun 2006
    Posts
    1,262
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by rufus View Post
    They might index. My 7-speed Deore XT shifters have an extra click in them, which I've never used on an 8-speed cassette so can't be certain that it would shift it correctly, but I recall reading that some people have used this on 8-speeds with no problems.

    Perhaps your 6-speed shifters might have an extra click too?

    It's not about the 'number of clicks.' If you look around you can find spacing charts...but I know that within the shimano arena 6 and 7 speed shifters are spaced differently. The above poster who mentioned that his new 7 speed indexed shifters work with his older 6 speed freewheels....is most likely using older Suntour Ultra-6 freewheels, not a shimano spaced 6 speed freewheel.

    I recently went through this to replace my old 6 speed freewheel that I was running with shimano DT shifters and 600 R/D. I had the shop spin a shimano 6 freewheel on to replace it only to realize that the spacing was off. After some head scratching (and I'm surprised my mech didn't beat me to it) I realized that my DT shifters were in fact 7 speed afterall, but had been running with the less common Ultra-6 Suntour freewheel, which is why they worked. I was able to install a standard 7 speed freewheel and reset the limits and adjust for perfect shifting.

    -Jeremy

Posting Permissions

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