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Downtube Shifters w/ MTB Triple?

Old 07-28-06, 09:14 PM
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dillybravo
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Downtube Shifters w/ MTB Triple?

Can anyone tell me if it's possible to use, say, Shimano 600 or Dura Ace downtube shifters with a MTB triple derailleur (Deore LX)? I'd assume it's fine since it'd be friction anyway but maybe the need for extra cable pull would be unwieldly. Please excuse me if this is a total n00b question and thanks in advance for any replies.
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Old 07-29-06, 05:40 AM
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It will work. Road STI's won't work with MTB front derailleurs but the dt shifters will.
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Old 07-29-06, 10:10 AM
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Originally Posted by HillRider
Road STI's won't work with MTB front derailleurs but the dt shifters will.
Hmmm, that's interesting. Would you explain? I'm not disagreeing, just trying to expand knowledge base. Also, my C'dale SR500 has a front triple with STIs. The triple looks more like a MTB triple than a road set. So I just want to understand what the difference is.
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Old 07-29-06, 10:18 AM
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Originally Posted by HillRider
It will work. Road STI's won't work with MTB front derailleurs but the dt shifters will.
Other then the tooth count of the chain rings, what's the difference between a road and MTB derailleur that the levers will not work?
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Old 07-29-06, 10:50 AM
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Originally Posted by roccobike
Hmmm, that's interesting. Would you explain? I'm not disagreeing, just trying to expand knowledge base. Also, my C'dale SR500 has a front triple with STIs. The triple looks more like a MTB triple than a road set. So I just want to understand what the difference is.
When in doubt following hillrider's advice is always a good idea.

Down tube shifters are friction on the front side and, consequently, will shift just about anything. STI triples, on the other hand, can be a bear to set up even when all of the parts match. Shimano says not to mix road and mountain parts. I've heard that the cable pull ratios are a little bit different but I don't know that for sure. The conventional wisdom is that you can use mountain shifters with a road derailleur and chainrings but not road STI shifters with a mountain bike derailleur and chainrings.
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Old 07-29-06, 11:27 AM
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Originally Posted by dillybravo
Can anyone tell me if it's possible to use, say, Shimano 600 or Dura Ace downtube shifters with a MTB triple derailleur (Deore LX)? I'd assume it's fine since it'd be friction anyway but maybe the need for extra cable pull would be unwieldly. Please excuse me if this is a total n00b question and thanks in advance for any replies.
Down tube front shifters work with everything, because they are not indexed. This is also true of bar-end shifters.

Shifter/derailer compatibility is only an issue for indexed shifters.

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Old 07-29-06, 04:36 PM
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Originally Posted by Wogsterca
Other then the tooth count of the chain rings, what's the difference between a road and MTB derailleur that the levers will not work?
As far as indexing goes the rear is no problem. Shimano uses different pull lengths on their road and MTB front derailleurs. That is why STI won't work with Deore front ders. Shimano also makes a special Road Flat Bar set of controls.

Like Sheldon says it's really a moot point with friction shifting. Good luck

Tim
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Old 07-29-06, 04:44 PM
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Originally Posted by cs1
As far as indexing goes the rear is no problem. Shimano uses different pull lengths on their road and MTB front derailleurs. That is why STI won't work with Deore front ders. Shimano also makes a special Road Flat Bar set of controls.
Tim
Thanks Tim, I just wanted to know why.
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Old 07-29-06, 07:16 PM
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As far as mountain shifters working with road front derailleurs go...the frankenbike I am trying to upgrade had a Sora derailleur, 105 cranks and LX shifters and the cable pull difference was enough to make it a huge pain. So I wouldn't recommend that combo, at least.

And for any newbies searching for this post later, I should add a caveat I didn't mention in my first post, which is that, since I have an 8-speed Deore LX rear derailleur it appears (according to Mr. Brown's handy chart, which I may have misinterpreted) that 8, 9 or 10 speed Dura Ace downtube shifters are out if I want to use the indexing.

Thanks to all for your replies, glad to know that there is no problem with the cable pull as long as it is friction only.
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Old 07-29-06, 08:42 PM
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Shimano road and mountain derailers and shifters do indeed have different cable pull ratios, and using friction shifters does indeed render this a non-issue.

This is one reason why I think that front indexing is of questionable utility compared to rear indexing (which rocks).
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Old 07-29-06, 09:14 PM
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Originally Posted by dillybravo
As far as mountain shifters working with road front derailleurs go...the frankenbike I am trying to upgrade had a Sora derailleur, 105 cranks and LX shifters and the cable pull difference was enough to make it a huge pain. So I wouldn't recommend that combo, at least.

And for any newbies searching for this post later, I should add a caveat I didn't mention in my first post, which is that, since I have an 8-speed Deore LX rear derailleur it appears (according to Mr. Brown's handy chart, which I may have misinterpreted) that 8, 9 or 10 speed Dura Ace downtube shifters are out if I want to use the indexing.
I'm afraid you have misinterpreted.

8-speed Dura-Ace shifters or any or 9-speed shifters will work with your 8-speed setup if you use the "alternate cable routing."

See: http://sheldonbrown.com/alternate

Any other 8-speed shifter will work with your 8-speed setup with standard cable routing.

The stuff about it being an "8-speed" derailer is just marketing hype, derailers don't care how many speeds. See: http://sheldonbrown.com/speeds

9- or 10-speed Dura-Ace or any other Shimano shifters will work with your setup if you upgrade to a 9- or 10-speed cassette.

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