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Bar end shifters for 7 speed?

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Bar end shifters for 7 speed?

Old 01-27-10, 06:31 AM
  #1  
mr_antares
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Bar end shifters for 7 speed?

My sister's boyfriend has lent me a mid-80s Trek with a 7 speed 105 setup. The only thing wrong with it (from my POV) is that has downtube shifters (at least they are indexed). I'd like to convert it to bar end shifters.

Are 7 speed (indexed) bar end shifters available anywhere? How do I tell them from the 8/9/10 speed ones? Also, are there any other parts I will need (besides the shifters, cables and housings) for this conversion?

Thanks
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Old 01-27-10, 07:00 AM
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7 speed barcons show up on the 'Bay from time to time. Some folks have had luck using 8 speed shifters on 7 speed clusters.
Another option would be to use your 105 DT shifters on the Riv/Dia-Compe barcon pods.
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Old 01-27-10, 07:01 AM
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You could just go with friction or ratchet shifting. It's not that hard...
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Old 01-27-10, 08:47 AM
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Ultegra 8 speed bar end shifters will work fine in my experience. They were sold as 7/8 speed shifters.
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Old 01-27-10, 01:26 PM
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Originally Posted by Grand Bois View Post
Ultegra 8 speed bar end shifters will work fine in my experience. They were sold as 7/8 speed shifters.
I was a little concerned about this. I'm sure that they work fine in friction mode, but Sheldon's page on spacing https://sheldonbrown.com/k7.html#spacing says that 7 speed Shimano uses 5 mm center to center spacing, while 8 speed uses 4.8 mm. This means that the indexing will be "slightly off" from one end of the cluster to the other (by 1.6 mm or so).

Is this large enough to make it hard to get into the big gear? Or will I be able to adjust it so that this doesn't matter?

Also, will I need cable stops (like this: https://harriscyclery.net/product/shi...osses-1737.htm). Although I have not taken the shifters off the downtube, I presume that since the shifters "bolt on" to the down tube, I'll need something to hold the cable end. There appear to be "flat back" and "curved back" versions, but I'm not clear on how to tell the difference.
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Old 01-27-10, 01:35 PM
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Sheldon also said that Ultegra 8 speed shifters work fine for 7 speed. I took his word for it and used them that way. He was right, as usual. I set up a bike that way years ago and it hasn't missed a shift yet.
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