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PostPosted: Mon Nov 13, 2017 1:15 am 
Dirt Disciple

Joined: Sat Apr 08, 2017 12:20 am
Posts: 23
Hi, I have a dura ace rear derailleur, model 7402 and it also reads integrated 8sis. I need some shifters, frame mounted to match. Does 8sis mean I have to find 8 speed shifter or can I use 7.
I know the 740 series are interchangeable, but wasn't sure on the above issue. Taaaaaaa


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 Post subject: Re:
PostPosted: Mon Nov 13, 2017 9:41 am 
gold | rider | rBoTM
gold | rider | rBoTM

Joined: Sat Jan 05, 2013 5:06 pm
Posts: 12484
Location: Worthing, West Sussex
You can use a 7s shifter, spacing is the same on the cassette between sprockets.

Mike


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PostPosted: Mon Nov 13, 2017 10:22 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8784
Location: New Forest, UK
7 and 8 spacing is not the same for Shimano (it is for Campag). 4.8mm spacing instead of 7 speed's 5.0. Campag uses 5.0 on both.

To get it right use an 8 speed shifter.


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 Post subject: Re: da
PostPosted: Mon Nov 13, 2017 3:03 pm 
Dirt Disciple

Joined: Sat Apr 08, 2017 12:20 am
Posts: 23
Ah right, will have to try both!!! Thank you!


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PostPosted: Tue Nov 14, 2017 7:43 pm 
Gold Trader
Gold Trader
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Joined: Mon Jan 15, 2007 11:40 am
Posts: 3253
It will have to be a DA 8 speed shifter, any other will not work (apart from DA 9 speed, which will work with 8 speed dura ace on an 8 speed cassette)


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 Post subject: Re:
PostPosted: Wed Nov 15, 2017 5:47 pm 
Dirt Disciple

Joined: Sat Apr 08, 2017 12:20 am
Posts: 23
OK, seems to be some confusion, some have said 7s will work!


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PostPosted: Sun Nov 19, 2017 4:02 am 
Retro Guru
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Joined: Mon Mar 26, 2012 5:21 pm
Posts: 635
https://sheldonbrown.com/cribsheet-spacing.html


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 Post subject: Re:
PostPosted: Sun Nov 19, 2017 9:31 am 
gold | rider | rBoTM
gold | rider | rBoTM

Joined: Sat Jan 05, 2013 5:06 pm
Posts: 12484
Location: Worthing, West Sussex
Match the shifter to the number of sprockets you have. If you're running 7, then a 7s shifter will work perfectly well with an 8s mech.
The difference comes between 8 and 9, as the cassette uses the same freehub body, so the 9 are closer together.
Hope that helps

Mike


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