Can someone tell me if Dura Ace SL-7700 9 speed index down tube shifters are compatible with Dura Ace 7410 8 speed group?
Quattro_Assi_07 said:Can someone tell me if Dura Ace SL-7700 9 speed index down tube shifters are compatible with Dura Ace 7410 8 speed group?
Ok, that sounds good. The reason I ask is that you had said a while back when I was thinking of using 7900 series shifter levers and a 7400 RD...Dave Hickey said:They will shift 8 speed perfectly... Hook it up normal and don't use the extra click.
The 9 speed DA shifters( or any 9 speed Shimano shifters) shift for 8 speed spacing when hooked up to a Dura Ace 7400 series rear derailleur... It's a unique situation and it was designed that way by Shimano.
My J P Weigle is set up that way
Trust me on this one.....Perfect shifts....and the silver 9 speed shifters look better than the gray 8 speed Dura Ace shifters...
Quattro_Assi_07 said:Ok, that sounds good. The reason I ask is that you had said a while back when I was thinking of using 7900 series shifter levers and a 7400 RD...
1. DA 7900 shifters won't work with 7400 series derailleurs..The 7400 derailleur has a unique pull ratio that will only work with 7400 series shifters.
Is there any difference bewteen 7400, 7401, and 7402 rear derailleurs? I believe the RD that I have and want to use is a 7401 and came to me as part of a 7 speed group I had purchased. I originally wanted to just get an 8 speed shift lever but they don't seem to show up all that often and like you said, the silver finish of the 7700 series is a lot nicer.
Another question for you... since I will go the route of 7700 9 speed shift levers, can I go ahead and use a 9 speed cassette on 8 speed hubs? If this can be done, would there be any benefit in using the 9 speed cassette versus the 8 speed other than having one extra gear? Did the shifting improve at all?
Sorry Dave, my original question was clear as mud, as they say...Dave Hickey said:1. 8 speed spacing is different than 9 or 10 speed.You can't use 7900, 7800, or 7700 shifters to shift 9 or 10 speed with a 74xx series derailleur.. you can use them to shift 8 speed when connected to a 74xx series rear derailleur.
2. Shimano made minor changes to deraileurs 7400, 7401, etc... but it doesn't effect shifting or the number of cogs you can use, Any 74xx series derailleur will shift 6,7, or 8 speed when connected to the appropriate shifters..
3. When I replied in a early post about 7900 shifters not working with 74XX derailleur, I believe you were asking about using it to shift 10 speed not 8....
I know this gets confusing....Dura Ace 74xx series derailleurs have a unique pull ratio that is unlike any other Shimano derailleur..Simply put; for every click of a shifter, the 74xx series RD will travel a larger distance than other Shimano derailleurs
Shimano abandoned the idea and, starting with the 7700 series, made the DA rear derailleurs with the same pull ratio as all other Shimano derailleurs
Back to your original post, you are fine when using 7700 shifters with a 74XX RD only if you want to shift 8 speed..You cannot use this combination if you want to use 9 cogs...
zmudshark said:Dave, Do you have any idea how a set of Dura Ace 8 speed STI's, coupled with a 7402 RD would mate up with a Campy 8 speed wheel, apart from the planets being tossed off their axises and all of that ?
I'll let you know in a couple of weeks, when the parts arrive. I'm thinking it should be 'close enough'.Dave Hickey said:It should work....The reason I say that is Shimano 7 speed cassette cogs are 5.0mm apart and so is 8 speed Campy... I've shifted 7 speed Shimano with 8 speed shifters with no issues
I think it should work also. I share three wheelsets running sachs eight speed fw's (4.8mm spacing) between a Campy record eight speed bike and 7402 DA RD and Ultegra 9 speed brifter bike. They work equally well.zmudshark said:Dave, Do you have any idea how a set of Dura Ace 8 speed STI's, coupled with a 7402 RD would mate up with a Campy 8 speed wheel, apart from the planets being tossed off their axises and all of that ?