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Suntour barcon lever travel issue

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Suntour barcon lever travel issue

Old 07-22-15, 01:43 PM
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Suntour barcon lever travel issue

On my commuter bike I have a 1x8 setup using a single Suntour friction barcon and an aRX long-cage rear derailleur on a Shimano 8 speed cassette. The shifting is great, except the lever doesn't seem to have enough travel to move the derailleur all the way across the cassette. Before I can shift into the largest rear cog, the lever is already at 90 degrees. I can jerry-rig the derailleur so that it starts from the second smallest cog and it will reach the largest one no problem, but then I lose the use of my highest gear.

Has anyone had this issue with a vintage shifter on a modern cassette? Would a different derailleur pull a lesser amount of cable, enabling use of the whole cassette, or do I need a different bar end shifter?
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Old 07-22-15, 01:46 PM
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Did you have the chain on the smallest sprocket when you set the cable length/tension?
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Old 07-22-15, 01:50 PM
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Originally Posted by Sir_Name
Did you have the chain on the smallest sprocket when you set the cable length/tension?
Yes, unless I'm doing the jerry-rig. Then I place the chain on the second smallest cog.
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Old 07-22-15, 01:56 PM
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Sir_Name asks a good question, which stated another way is, "Is there any slack in the cable when the RD is at the limit with the least tension on the cable?" The point is that you may be self limiting if the cable has any slack at all I the configuration with the least tension.

If there isn't any slack, then you might be able to incorporate a device that changes the effective diameter of the barcon, that is it converts cable movement ratio between the barcon and the RD. More cable movement at the RD for same rotation angle. Senior moment prevents me from remembering the name of the device. It is often used to allow standard brake levers for use with canti's.

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Old 07-22-15, 01:59 PM
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Originally Posted by SJX426
If there isn't any slack, then you might be able to incorporate a device that changes the effective diameter of the barcon, that is it converts cable movement ratio between the barcon and the RD. More cable movement at the RD for same rotation angle. Senior moment prevents me from remembering the name of the device. It is often used to allow standard brake levers for use with canti's.
Even something as simple as a cocktail straw slid over the very end of the cable that wraps around the shifter could do this.
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Old 07-22-15, 02:01 PM
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I've checked the slack issue multiple times and done a lot of monkeying around. It seems as though the real issue is the short travel of the barcon itself -- it only goes about 90 degrees from straight down to straight back. Other bar end shifters I've used, including later Suntour barcons, have their lowest tension point at much farther forward of straight down, such that the total lever travel is more like 120 degrees.
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Old 07-22-15, 02:02 PM
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Originally Posted by IthaDan
Even something as simple as a cocktail straw slid over the very end of the cable that wraps around the shifter could do this.
That's an interesting idea.
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Old 07-22-15, 02:07 PM
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As interesting as it is, I would be concerned about durability. I tried to use pieces of 2x4 to lift a '56 Chevy in my youth. Lasted about 3 blocks, both in attempts and distance!
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Old 07-22-15, 02:21 PM
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I wonder if alternate cable routing might help.

Mixing Brands of Shifters, Rear Derailers and Cassettes

I have a SunTour 3090 shifting a 6sp freewheel and it seems the shifter has enough additional travel to cover at least one more sprocket, so you may be close. Of course, the other option is to start replacing components.
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Old 07-22-15, 02:30 PM
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Originally Posted by Sir_Name
I wonder if alternate cable routing might help.

Mixing Brands of Shifters, Rear Derailers and Cassettes

I have a SunTour 3090 shifting a 6sp freewheel and it seems the shifter has enough additional travel to cover at least one more sprocket, so you may be close. Of course, the other option is to start replacing components.
New to me. Worth a try, thanks.
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Old 07-22-15, 03:39 PM
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You're welcome, curious to hear if it works.
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