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Will it work? Dura Ace 7400 DT Shifter, modern 9s derailleur; 8-speed cassette

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Will it work? Dura Ace 7400 DT Shifter, modern 9s derailleur; 8-speed cassette

Old 09-21-13, 07:16 PM
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goatalope
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Will it work? Dura Ace 7400 DT Shifter, modern 9s derailleur; 8-speed cassette

So, I have 7s 7400-series DA downtube shifters, a (more) modern M952 XTR 9s derailleur and an 8 speed cassette. Will it work?

Did a lot of searching but nothing really answered my question. Lots about how a 7400 rear der needs 7400 shifters, but not much on how the shifters will work with other setups. And , yes, the shifters are 7s, but have an extra "hidden" shift (operates like friction), so it seems 8s is doable. Thoughts?
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Old 09-22-13, 10:12 AM
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FastJake
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Originally Posted by goatalope View Post
So, I have 7s 7400-series DA downtube shifters, a (more) modern M952 XTR 9s derailleur and an 8 speed cassette. Will it work?

Did a lot of searching but nothing really answered my question. Lots about how a 7400 rear der needs 7400 shifters, but not much on how the shifters will work with other setups. And , yes, the shifters are 7s, but have an extra "hidden" shift (operates like friction), so it seems 8s is doable. Thoughts?
Try it and see..

The DA7400 shifters pulled less cable than the rest. A DA7400 8-speed shifter actually pulls the same amount of cable as all Shimano 9-speed shifters. So a DA7400 7-speed shifter should pull a bit more cable than that, but I don't think enough to shift an 8-speed cassette. You might get away with it if you use the "alternate cable routing."

Bottom line is that I don't know exactly how much cable a DA7400 7-speed shifter pulls so I can't say for sure.
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Old 09-22-13, 02:51 PM
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In friction mode. Yes.

In index mode?....unlikely even with the over shift and alternate cable mode.
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Old 10-10-13, 06:50 PM
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So I tried it. And it worked awesome. Booyah. 7400 Dura Ace 7-speed shifters (with "friction" 8th speed), M952 XTR rear der (standard cable routing), SRAM 8 speed cassette, KMC 10 speed chain. Shifts flawlessly in index mode through the 7 speeds. Can use the 8th "friction" speed to get to the 8th gear, although the friction doesn't seem to have much friction, so it kept slipping back down to the 7th gear over rough stuff.

Did Iron Cross with this setup, so hard core tested.
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