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7 speed downtube shifter levers on 6 speed bar end mounts?

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7 speed downtube shifter levers on 6 speed bar end mounts?

Old 05-21-21, 09:26 AM
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drewfio
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7 speed downtube shifter levers on 6 speed bar end mounts?

Hello,

I have a bike currently set up with 7 speed indexed downtube shifters. I've been curious about using bar end shifters. I have a 6 speed indexed bar end shifters I pulled off another bike (never road it, since it was "for parts" condition) a while ago which I never used. I've seen mounts for attaching downtube shifters to bar ends, but I was wondering if I could use the same mounts as are on the 6 speed, and just replace the levers. Is this possible/reasonable?
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Old 05-21-21, 09:37 AM
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degan
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Depends on the shifters. I know the modern Shimano bar end shifters pods will accept just about any DT shifter that fits on the standard post, but I don't think they go back as far as 6 speed indexing, the fewest I've ever seen is 7 speed. If its the suntour accushift 6-speed bar-end shifters I'd be a little more skeptical about mixing and matching parts. The two sets I've had of those were very finicky just by themselves.
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Old 05-21-21, 09:47 AM
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Here are some photos of the parts in question. The downtube 7s shifter I believe is Shimano SL-A410 (not marked), and the bar end shifters say SL-BS50.



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Old 05-21-21, 09:57 AM
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This thread should be helpful.

Shimano SL-BS50 bar end shifter 6 spd adapter
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Old 05-21-21, 10:16 AM
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drewfio
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Oh! super Helpful. It turns out it does have one of the adapters mentioned in thread in there already, making it 6 speed. I also, when pulling it apart just now found it seems to have the square mount inside oriented wrong (it was only clicking 3 times). When I spun it around into a different orientation, it in fact clicks 7 times, so it is an 8 speed? It doesn't seem to shift great, and my current downtube shifts quite well, but maybe worth giving it a shot as is (since 8 speed shifter I understand can shift a 7 speed cassette)?

Last edited by drewfio; 05-21-21 at 10:17 AM. Reason: clarification
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Old 05-21-21, 10:41 AM
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I don't know why you're getting an extra click, but your shifters should be 7 speed with the adapter removed. My understanding is that the 8 speed version (sl-bs-50-8) is Dura Ace only, it can't be converted to 6 speed.
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Old 05-21-21, 11:51 AM
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icemilkcoffee
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Originally Posted by drewfio View Post
Oh! super Helpful. It turns out it does have one of the adapters mentioned in thread in there already, making it 6 speed. I also, when pulling it apart just now found it seems to have the square mount inside oriented wrong (it was only clicking 3 times). When I spun it around into a different orientation, it in fact clicks 7 times, so it is an 8 speed? It doesn't seem to shift great, and my current downtube shifts quite well, but maybe worth giving it a shot as is (since 8 speed shifter I understand can shift a 7 speed cassette)?
I noticed the same thing with my 7 speed BS50. For some strange reasons, it has 7 clicks, which technically gives it 8 positions.
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Old 05-21-21, 12:12 PM
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Originally Posted by icemilkcoffee View Post
I noticed the same thing with my 7 speed BS50. For some strange reasons, it has 7 clicks, which technically gives it 8 positions.
Yep. There's a low-side overshift built into the shifters, to allow for bail-out downshifts under load. This is why you can use a 7 speed shifter on an 8 speed bike and the indexing works. I had a mountain bike set up this way, because I hate trigger shifters. (8 speed cassette, 9 speed XTR rear derailleur, 7 speed XT thumbshifters, best-shifting MTB I've ever owned)

--Shannon
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Old 05-21-21, 02:47 PM
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Here’s my 7sp setup.

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