Originally Posted by
masi61
So if I understand correctly - you had these 6/7 speed Superbe Pro shift levers working correctly with a SunTour Sprint RD while running Dura Ace 7speed UniGlide on your previous bike?
And now you are attempting to do a similar setup on the new bike but this time with the older style Superbe RD?
I’m confused if the auto shifting is occurring in both friction and index mode?
If it is auto-shifting into smaller cogs on its own when climbing hills, this suggests that the D-ring is not tight enough. If you have tightened it up as tight as you feel comfortable with then you might need to run a corresponding tap into the shift lever braze on to see if there is some crud on the threads or if can be tapped a bit deeper…
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Yes it was working indexed (never tried it friction previously) on my Zunow. The indexing was not great and needed to be coaxed a bit towards the middle of the cob but it did function reliably. I would now like to run it with this older gen Superbe Pro RD on friction mode. I have never tried friction and would like to compare to my Zunow which currently has 8 speed DA STI. The reason is that cosmetically i prefer the DT look but ergonomically STI is much better. Since I ride these daily, I would like to see if I can live with friction despite the better STI ergo for my Zunow. If not then I will need to buy another bike to run STI on in true N+1 fashion hehe.
Yes the ghost shifting is happening both in friction and indexed. It happens less in indexed but I can still induce an auto shift with about 200m of hard out of the saddle uphill. Under the friction setting, even with medium seated pedalling the RD starts to auto shift in under 100m.
Originally Posted by
dddd
I have a lot of experience dealing with Suntour Accu-7 setups using different cogs and derailers.
My first question will be if the shifter has been lubricated?
I always advise that the cable's path be entirely plastic-lined, for both index and friction setups. I go as far as fitting plastic tubing to any bare-metal bb cable guide, retained by a blob of 5-minute epoxy.
Some of the Accu-7 levers have an indexing selector ring with up to three marked positions, and you don't want anything to do with the F7 setting. Pure friction or pure detent action is preferred. Be sure that the selector ring itself is in it's proper detent (I believe that the friction screw must be slackened to reposition it and to examine it's range of motion).
The only detent position that ever seems to wear out is the one for the largest cog, the result of the lo-limit screw being set too tight over many thousands of frame-flex cycles.
Never lubed it since I read too much might cause slipping. That said the bike shop did the first install so I will ask them if they did. There are loud clicks when indexing but not as loud as my Sprint accushift. It does feel super nice indexed.
The shop did fit inner cable plastic at the sections where the cable runs through the BB cable guides. When testing I thought that might be a problem so I moved further up the cable and away from the bend and it did improve a bit so I will keep it off for the time being.
Originally Posted by
Classtime
You can can shorten the shifter thumbscrew a little. It might be bottoming out and you think it is tight. It is. But not against the shifter.
I was thinking this might be the reason I cant get it tight enough. Will check it out and see what I can do about it. On my ride earlier I tried using a pliers to get it tighter. Got it a teeny bit tighter and the auto shifting took more time but in the end it did still auto shift. At least I feel this is the right direction. Wont touch the RD for now and will focus on Shifters.
Originally Posted by
JacekM
hello, which suntour superbe pro has an index for 7 gears?
I believe its the 1991 Superbe Pro DT shifters
VeloBase.com - Component: SunTour Superbe Pro (6, 7 index). They are super pretty imo.
1992 onwards had 7 & 8 speed indexing
VeloBase.com - Component: SunTour Superbe Pro (7, 8 index).