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Barcons for 6/7 speed?

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Old 07-21-11, 12:19 PM
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The MAX
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Barcons for 6/7 speed?

Hey all,

I'm building a new city/cruiser upright position bike for around the city. beat up paint job to deter theft but it has a nice Exage 300LX groupset. I'm converting to a type of butterfly bar though and the MTB shifter/lever combo is not that great for this style of bar. Because of the spacing and the wheelset I already have I'm going to keep it 6 speed or maybe increase to 7, and I would like to have barcons.

The only one's I've seen though indexed for 7 are are suntour accushift 7 speed. Are these compatible with shimano indexing on the rear mech? If not I will probably just get some random barcons and shift in friction mode.

What do you think?

here is the bike so far. will post some more recent pics this evening.



and this is as found (i know not much difference lol... YET!)

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Old 07-21-11, 12:29 PM
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I don't think you could use the Suntour Barcons to index the Shimano RD but you may be able to use Shimano 8 speed barcons to index a Shimano 7-speed RD.

From Sheldon Brown:

7 and 8-speed systems use a relatively wide, and almost identical, spacing between sprockets, and the same tried-and-true chain. 8 or more speeds require a longer rear axle. Rear-wheels get weaker as dishing becomes more extreme. Cornering clearance is reduced and tread width ("Q factor") increases. With 9-speed systems -- even more, 10-speed -- index shifting becomes more finicky as sprockets crowd closer together. Each new generation of chain is narrower, weaker and harder to service.

Certainly, most bicycles with 7-speed cassettes can be upgraded to 8, 9 or 10 speeds. There's information on this site on how to do that. But, you also can stay with 7 and you don't have to regret it. Some kinds of 7-indexing speed shifters are getting hard to find, but 8-speed shifters will work with a 7-speed cassette.
You'd just get rid of the 8th shift with the limit screws of the RD, limiting the 8 speed barcon to its first 7 positions.

http://sheldonbrown.com/k7-7.shtml
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Old 07-21-11, 12:29 PM
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Friction shifters such as the old Suntour bar ends, or the new Silver shifters would work fine.

The silver shifter bar end pods can be used with Shimano indexed down tube levers with the addition of one part. The Rivendell site will be more specific.

Shimano made six and seven speed indexed barends, but it might be difficult to find some.
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Old 07-21-11, 12:32 PM
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Originally Posted by ironwood View Post
Friction shifters such as the old Suntour bar ends, or the new Silver shifters would work fine.

The silver shifter bar end pods can be used with Shimano indexed down tube levers with the addition of one part. The Rivendell site will be more specific.

Shimano made six and seven speed indexed barends, but it might be difficult to find some.
Forgot about that option too, would work fine as well if you already have 7 speed downtube shifters.
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Old 07-21-11, 01:33 PM
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Originally Posted by ironwood View Post
The silver shifter bar end pods can be used with Shimano indexed down tube levers with the addition of one part. The Rivendell site will be more specific.
Easy now. Some will work. The 6 sp Shimano shifters I have will not work because the cable guide does not line up. There are threads here that discuss this. My vote is for Suntour or Silver. Use friction and fughedaboudit.
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Old 07-21-11, 01:57 PM
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Originally Posted by ColonelJLloyd View Post
Easy now. Some will work. The 6 sp Shimano shifters I have will not work because they cable guide does not line up. There are threads here that discuss this. My vote is for Suntour or Silver. Use friction and fughedaboudit.
I'm inclined to agree, but if the OP is set on indexing I think the 8-speed Shimano barcons are his best bet.
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Old 07-21-11, 02:36 PM
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MAX, I think the most trouble free indexing set up would be an 8S cassette, minus one gear and a set of 8S bar end shifters. A 7S cassette with 8S shifters works for some, hellish for others.

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Old 07-21-11, 03:09 PM
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Shimano 7 speed bar ends were made. 8 speed is easier to find and will work just as well.

SunTour bar ends will also work, but you will have to use the soft index.

Friction is the easiest answer to this question though. SunTour Barcons or Silvers.
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Old 07-21-11, 06:38 PM
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