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How much cable pull for an STI front derailleur?

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How much cable pull for an STI front derailleur?

Old 06-03-15, 02:19 PM
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noglider 
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How much cable pull for an STI front derailleur?

Mixing and matching stuff is harder than I expected. I bought a used Tiagra 3x9 drivetrain (just shifters and derailleurs). The seat tube clamp diameter was too big, so rather than shim it, I used an Ultegra front derailleur I had on hand. The shifter doesn't pull nearly enough cable. It can't even shift from one chainring to the next when I go from the loosest setting to the tightest setting on the shifter.

Is there a chart of how much cable each shifter pulls and how much each derailleur requires for each shift?

For the time being, I'm using a downtube shifter for the front derailleur. I'll also try shimming the Tiagra front derailleur, but to do that, I'll have to find where I tossed it. Somewhere dumb, apparently.


@Dan Burkhart, I know you built a cable pull measuring machine, but I don't suppose you've measured many shifters or derailleurs with it.
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Old 06-03-15, 06:14 PM
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Originally Posted by noglider View Post
Mixing and matching stuff is harder than I expected. I bought a used Tiagra 3x9 drivetrain (just shifters and derailleurs). The seat tube clamp diameter was too big, so rather than shim it, I used an Ultegra front derailleur I had on hand. The shifter doesn't pull nearly enough cable. It can't even shift from one chainring to the next when I go from the loosest setting to the tightest setting on the shifter.

Is there a chart of how much cable each shifter pulls and how much each derailleur requires for each shift?

For the time being, I'm using a downtube shifter for the front derailleur. I'll also try shimming the Tiagra front derailleur, but to do that, I'll have to find where I tossed it. Somewhere dumb, apparently.


@Dan Burkhart, I know you built a cable pull measuring machine, but I don't suppose you've measured many shifters or derailleurs with it.
Hi Tom.
The main reason I built it was to answer questions about mixing and matching shifters for gearhubs. Mostly, it's just served to prove mixing and matching rarely if ever works.
some day, when I run out of other stuff to do, I'll get serious about using it to create a database,
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Old 06-03-15, 07:48 PM
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8,9 or 10 Ultegra should work with your 9 Tiagra. Do you have the cable routed correctly over the retaining bolt?
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Old 06-03-15, 09:08 PM
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Originally Posted by shelbyfv View Post
8,9 or 10 Ultegra should work with your 9 Tiagra. Do you have the cable routed correctly over the retaining bolt?
I'll check. Thank you, and thank you, @Dan Burkhart.
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Old 06-03-15, 09:59 PM
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Originally Posted by noglider View Post
Mixing and matching stuff is harder than I expected. I bought a used Tiagra 3x9 drivetrain (just shifters and derailleurs). The seat tube clamp diameter was too big, so rather than shim it, I used an Ultegra front derailleur I had on hand. The shifter doesn't pull nearly enough cable. It can't even shift from one chainring to the next when I go from the loosest setting to the tightest setting on the shifter.
One guess is that the Ultegra derailleur is for doubles only. What's the part number on it?
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Old 06-04-15, 08:41 AM
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Can you measure the distance the cable anchor bolt swings as it moves from the 2 limits of the stroke as the screws settings allow,

on the actuating arm of the FD itself?

sharpie marks on the seat tube...
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Old 06-04-15, 08:53 AM
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Originally Posted by LesterOfPuppets View Post
One guess is that the Ultegra derailleur is for doubles only. What's the part number on it?
Another good question. I'll be able to look on Saturday morning.
Originally Posted by fietsbob View Post
Can you measure the distance the cable anchor bolt swings as it moves from the 2 limits of the stroke as the screws settings allow,

on the actuating arm of the FD itself?

sharpie marks on the seat tube...
That might be worth pursuing. But I think the best solution might be to find the FD and shim it onto the seat tube.
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Old 06-04-15, 09:15 AM
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Oversize seat tube band clamps on a standard Diameter seat tube would let the FD swing further inward, as the FD itself

is able to be mounted further outboard , relative to the frame.
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Old 06-04-15, 10:01 AM
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Now, I'm not qualified to offer much advice, except to say that I'd be very much surprised if 4500 Tiagra had a different pull ratio than 6500 Ultegra. I have 9-speed ST-R600 shifters (these replaced ST-6503 on my bike) combined with a 9-speed 105 triple (FD-5603) front changer and the combination works as though intended that way. I guess, my uneducated hunch, I'd have to say, "It should work."
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