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How is a Tiagra ST-4700 front shifter supposed to operate? Do I have an ST-4703?

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How is a Tiagra ST-4700 front shifter supposed to operate? Do I have an ST-4703?

Old 03-29-18, 12:07 PM
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pautler
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How is a Tiagra ST-4700 front shifter supposed to operate? Do I have an ST-4703?

I recently purchased and installed a Shimano Tiagra 4700 2x10 groupset.

Everything is working pretty well, but the behavior of the left (front) shifter seems strange to me. I'm wondering if I might have an ST-4703 triple chain ring shifter, instead of an ST-4700 double chain ring shifter. How can I tell for sure? Or, maybe I have an ST-4700 with a flaw?

The part number that is stamped on the hood, underneath the rubber cover, is ST-4700.

I think it might be the trim positions that are confusing me.

When I am in the large chain ring, but want to use large cogs in the rear, the "small click" adjustment to "trim" the front derailluer inward works perfectly.

Similarly, when I am in the small chain ring, but want to use small cogs in the rear, the "small click" adjustment to "trim" the front derailluer outward works perfectly.

The part that seems strange to me is that when I want to do a full shift from the large chain ring, down to the small chain ring, I need to hit the shift lever twice. Is that normal? When shifting from the large ring to the small ring, is it supposed to stop at some intermediate position between the two? The first time that I push the lever it is enough to drop the chain to the small ring, but there is fairly significant rubbing. Then I need to push the lever a second time, in order for the front derailluer to go to its full inboard position.

Thank you!!

-Joe

Last edited by pautler; 03-30-18 at 07:42 AM.
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Old 03-29-18, 11:58 PM
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desertdork
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It sounds like you're not pushing the lever quite far enough. It should drop from large to small ring with a single stroke.

Just read your post again. I may have misunderstood. It sounds like the issue is with small-small combination. Grab the flame suit.
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Old 03-30-18, 04:07 AM
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Thanks for the reply. I understand cross-chaining, and that small-small & big-big combinations are not intended to be used. That is not the scenario for my question.

To summarize my question, is it 'normal' to require two clicks of the shifter to move the ST-4700 front derailluer from it's fully outboard position (big ring... high limit setting) to it's fully inboard position (small ring... low limit setting)? In other words, on the way down, is it supposed to stop at one of the intermediate "trim positions?"

In practice it seems to working very well, so maybe that is just the way it is supposed to be. When shifting the front from the big ring to the small ring, I am always in one of the "middle" cogs in the rear, so the first shift of the front derailluer works perfectly. The chain drops to the small ring, with no rubbing. If I then proceed to shift the rear up to the largest cog or two, for a steep climb, I then need to operate the front shifter once more, to move it to it's fully inboard position, to remove the chain rub.

This 4700 group set is completely new to me (I upgraded from really old 8-speed Sora), so I was just wondering if someone might be able to confirm whether my shifter is working "as expected," of if there is some minor flaw in it.

Thanks...

-Joe
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Old 03-30-18, 08:10 AM
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I've a 4700 group set on one of my bikes, the front changes down with just one touch, going up is not as smooth as coming down but going up you are pushing the spring on the RD away (against tension), whereas coming down its spring loaded to drop back.

You maybe need to check the cable slack ? i.e. is it too slack in the small cog position ?
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Old 03-30-18, 03:31 PM
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I bought a used Specialized Dolce and found the same issues with that 2x10 groupset. Allow zero slack on cables and keep the FD clean and well lubed solved MOST of it. Still happens about once every ride. I think I actually prefer the 3x8 Claris group on my steel bike. It almost never needs trimming.
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Old 03-30-18, 05:57 PM
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Originally Posted by pautler View Post
Thanks for the reply. I understand cross-chaining, and that small-small & big-big combinations are not intended to be used. That is not the scenario for my question.

To summarize my question, is it 'normal' to require two clicks of the shifter to move the ST-4700 front derailluer from it's fully outboard position (big ring... high limit setting) to it's fully inboard position (small ring... low limit setting)? In other words, on the way down, is it supposed to stop at one of the intermediate "trim positions?"

In practice it seems to working very well, so maybe that is just the way it is supposed to be. When shifting the front from the big ring to the small ring, I am always in one of the "middle" cogs in the rear, so the first shift of the front derailluer works perfectly. The chain drops to the small ring, with no rubbing. If I then proceed to shift the rear up to the largest cog or two, for a steep climb, I then need to operate the front shifter once more, to move it to it's fully inboard position, to remove the chain rub.

This 4700 group set is completely new to me (I upgraded from really old 8-speed Sora), so I was just wondering if someone might be able to confirm whether my shifter is working "as expected," of if there is some minor flaw in it. I can check later exactly how my 4700 works. I can check later on my 4700.

Thanks...

-Joe
I believe this is normal behaviour. The front mech has four positions. You can go all the way up from inner to outer in one go, pushing the brake lever all the way. The other way, from outer to inner position requires more than one click on the lever.
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Old 04-01-18, 07:27 AM
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Originally Posted by Racing Dan View Post
I believe this is normal behaviour. The front mech has four positions. You can go all the way up from inner to outer in one go, pushing the brake lever all the way. The other way, from outer to inner position requires more than one click on the lever.

Thank you, Racing Dan, and everyone else.

The shift indexing seemed strange to me when the bike was on my work stand, but now that I have been riding it, it seems obvious to me that it is working exactly the way it is supposed to work.

As described in my previous message, when I shift the FD from the big ring to the small ring, it drops down perfectly. since I am not in the two largest (ie "lowest") gears, everything is nice and smooth. If/when I need to shift the RD into those lowest gears (the biggest cogs), then I can just click the FD shifter again if I want to trim it further inboard. Most of the time I never hit this scenario, since it only happens when climbing the steepest inclines.

Now that I have ridden it a few times, I am *really* loving my new Tiagara 4700 10-speed group set. It is significantly smoother and crisper than the old Sora 8-speed group that I replaced.

Thanks again for the help, everyone!

-Joe
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