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Old 11-17-09, 09:23 AM   #1
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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.
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Old 11-17-09, 11:02 AM   #2
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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.
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Old 11-17-09, 12:18 PM   #3
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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.
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Old 11-17-09, 06:30 PM   #4
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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?
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Old 11-17-09, 07:23 PM   #5
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6 speed thumbies have an extra click, but I've read that 6 Shimano speed cog spacing is different than 7 speed spacing.
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Old 11-18-09, 08:27 AM   #6
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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
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