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Old 07-18-11, 09:20 PM   #1
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How to tell diff between left ST-6703 and ST-6700 ???

How can I tell that a left Shimano ST-6703 (triple crankset) shift lever is not actually a ST-6700 shifter (double crankset)?

Scenario: I have a 2010 frameset that came with a mix of Shimano 105/Tiagra/no-name components. The brakes were Tiagra (which were changed real quick to Ultegra). The "no-name" was a non-series Shimano triple crankset, since changed out to the Ultegra triple. The 105 was the drivetrain.

I've converted all the components to Ultegra, except for the shifters. Received them and took the bike into one of my LBS to have the bars changed (I like the traditional round shape), and have the Ultegra ST-6703 shifters replaced at the same time. Am having all the cables replaced also since it's been a couple years and many miles on the orig cables.

The shop called me a bit ago and insisted that the left shifter is a ST-6700 (front double shifter), instead of a ST-6703 (triple crankset). Fellow said that everyone in the shop verified that the left shifter is for a double, and that it only has "two clicks".

The box the shifters came in is marked to indicate the contents as ST-6703, however the enclosed tech sheets are ambiguous. One "Technical Service Instructions" says "ST-6703 Front DUAL CONTROL Lever" (doc # SI-6SE0A-001), and the other "Technical Service Instructions" says "ST-6700 Shimano Total Integration" (doc # SI-6SC0A-001). The two tech sheets from the Shimano web site are the exploded schematic/diagram and a TSI ST-6703/ST-5703 "Front Dual Control Lever" (SI-6SE0B-002).

Thinking about the "two shift clicks", to me, that seems right (for a triple). The ring you are in, and the other two. Stupid logic would indicate that a double would only have one shift click. Then again, remembering the 105 shifters ... you don't get from one chain ring to another by a single click. You have to "milk it". Maybe he is confusing the SRAM shifters for the Shimano ones? On a 105 and Ultegra shifter, should just a single lever throw change the chainring? Seems that on my Dura-Ace 7900, I have to use two swings of the lever to go from the small to large chainring, (but going down just takes a single throw).

Boy, I sure do miss the days of the downtube shifters. They were easy to adjust and use.

Can anyone familiar with the ST-6703 shifters help me? I am picking up the bike tomorrow, partially assembled, (they installed the rear/right shifter, but not the left one. I'd really hate to take everything apart to return it to the place I purchased it from, and all the hassle that entails. Maybe this shop just doesn't know what they are doing, (as far as triples go).

Is there any marking on the shifter itself to indicate the model number?

Thanks for any help you can proffer.
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Old 07-18-11, 09:42 PM   #2
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Not sure of the Shimano levers per se, In Campy a 10s right lever has 9 clicks separating the 10 lever positions. It might help you to understand if you look at the back of your hand where there are 3 spaces (clicks) between the 4 knuckles.

Following that logic, I suspect that 2 clicks would mean that there 3 positions. - inner, click, middle, click, outer.
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Old 07-18-11, 10:08 PM   #3
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...Following that logic, I suspect that 2 clicks would mean that there 3 positions. - inner, click, middle, click, outer.
That's what I'm thinking. And thinking that this "hot" pro shop doesn't understand triples.
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Old 07-18-11, 11:41 PM   #4
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...Unless one of the clicks is just a trim, not an actual shift. Personally, I haven't felt a ST-6700 to know, though. My triple 105 shifter, which I'm using as a double), has a trim after the inner and middle position.
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Old 07-19-11, 12:00 AM   #5
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Also, installing a FD cable is pretty easy, so before you leave the shop, just buy the housing, ferrules, cable, and crimp. If you don't have cable housing cutters, just have the shop cut the housing to the same length as the one for the rear shifter.
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Old 07-19-11, 12:07 AM   #6
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Coincidentally, after I read your post, I was going thru some old photos and found one of the shifter model stamped on the plastic body (6600 in my case). Peel back the hood and you might find the model number. I am not sure how to post a pic here, but I will try to send you one via PM.
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Old 07-19-11, 01:35 AM   #7
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Both my bikes with 6703 triples have the left shifter stamped Flightdeck Triple at the top of the lever.
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Old 07-19-11, 06:59 AM   #8
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Both my bikes with 6703 triples have the left shifter stamped Flightdeck Triple at the top of the lever.
Thank you all.

This is it! Found some pictures on the net that shows the face plate with this wording. Funny thing ... the "triple" wording is only on the left shifter, not the right one. Makes sense because the right shifter controls the RD, and those are the same for triples and doubles. The ST-6700 left shifter has the same wording as the right shifters, (i.e., "Flightdeck"). Thanks for the tip. First thing I check when I pick up my bike later today.
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Last edited by volosong; 07-19-11 at 09:43 AM.
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Old 07-21-11, 07:35 AM   #9
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To be certain, peel back the left-hand lever hood on the outside of the lever, and you should find the model number printed in a little box. You may have to also pull pack a bit of bar tape, but it won't be hard. This is an even more certain indicator than what is written on the front face-plate.
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Old 07-21-11, 08:32 AM   #10
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To be certain, peel back the left-hand lever hood on the outside of the lever, and you should find the model number printed in a little box. You may have to also pull pack a bit of bar tape, but it won't be hard. This is an even more certain indicator than what is written on the front face-plate.
I'll do that tonight. A new ST-6703 left shifter has been ordered, and Amazon gave me a 50% credit because it was not possible to return the kit. (Kinda different for them, but I think it was sent from one of their affiliates. Something like that.) They are letting me keep the ST-6700 left shifter and selling that with the credit means I'm won't be out any additional money ... just some lost time while the bike is tied up at the shop. No worries as I can use my other bike in the meantime.
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Old 07-21-11, 11:05 AM   #11
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Shimano triple front road shifters have 4 main positions (3 clicks) plus a soft trim position for the small chainring. This provides 2 positions for each chainring to be used for trimming.
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Old 10-09-13, 08:19 AM   #12
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Shimano triple front road shifters have 4 main positions (3 clicks) plus a soft trim position for the small chainring. This provides 2 positions for each chainring to be used for trimming.
Could you talk more about the "soft" trim on the inner chainring? I'm familiar with the trim function as described by Shimano but don't think I understand the "soft" trim" part...

here's the Shimano info; trim is shown in the upper-right corner.
http://techdocs.shimano.com/media/te...9830702960.pdf

thanks in advance!

-Tom in SoCal
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Old 10-09-13, 04:05 PM   #13
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Could you talk more about the "soft" trim on the inner chainring? I'm familiar with the trim function as described by Shimano but don't think I understand the "soft" trim" part...
Most properly adjusted Shimano triple capable front shifters have this feature. You can use the smaller shift lever to move the front derailleur far enough to the right to allow the chain to run on the right side of the cassette and smallest chainring without chainrub on the front derailleur. This is often referred to as a soft click because the shifter can do this without clicking into a new detent. Of course it is not advisable to cross-chain as far as having the chain on the smallest chainring and smallest cassette cog due to the extreme chain angle. The soft click position may be useful on a long mountain pass when running on the smallest chainring and several of the cassette cogs are needed for changes in road grade and you would like to avoid having to shift back and fourth to the middle chainring which id often a rough shift during climbing.
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Old 10-09-13, 04:18 PM   #14
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Basically flight deck shifters are cheasy same for both 2/3 and for whatever party goers show up and play.
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Old 10-09-13, 04:22 PM   #15
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In a nutshell, if you can swing the shifter lever all the way ONCE and only once with one or more clicks on that single swing, then it is a double ONLY shifter. If you can swing the lever all the way over once and then swing it again, then it is a triple.

As noted, Shimano brifters have trim positions. I know that my Ultegra 9 speed triple shifters have 2 or 3 clicks when shifting to the middle ring and then I swing the lever again to complete the final click.

Its not so much about how many clicks but rather how many times you can fully swing the lever. If you can fully swing the lever only once before it locks, then it is a double, if you can swing the lever twice all the way, then it is a triple.

Yes, you can swing the lever partway on a double to the first click and then swing it again partway for the second click with a double but that means you only hit the first trim position. It still won't work with a triple.
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Old 10-09-13, 05:08 PM   #16
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Most properly adjusted Shimano triple capable front shifters have this feature. You can use the smaller shift lever to move the front derailleur far enough to the right to allow the chain to run on the right side of the cassette and smallest chainring without chainrub on the front derailleur. This is often referred to as a soft click because the shifter can do this without clicking into a new detent. Of course it is not advisable to cross-chain as far as having the chain on the smallest chainring and smallest cassette cog due to the extreme chain angle. The soft click position may be useful on a long mountain pass when running on the smallest chainring and several of the cassette cogs are needed for changes in road grade and you would like to avoid having to shift back and fourth to the middle chainring which id often a rough shift during climbing.
I am playing with a spare Tiagra triple front shifter sitting right in front of me. I can confirm exactly what you are describing. If I slightly move the handle, I can feel a total of 5 clicks.

If I swing the handle all the way once, I feel a total of 3 clicks and then if I do the final swing, I feel 2 more clicks during that swing.

Its is on a Tiagra ST-4500.
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Old 10-09-13, 07:56 PM   #17
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To be certain, peel back the left-hand lever hood on the outside of the lever, and you should find the model number printed in a little box. You may have to also pull pack a bit of bar tape, but it won't be hard. This is an even more certain indicator than what is written on the front face-plate.
Are you sure about that? My ST-4503 is marked ST-4500.
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Old 10-11-13, 01:45 AM   #18
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Some series do not have dedicated, different double and triple shifters. I expect that includes the Tiagra 4500 series, therefore all left-hand Tiagra shifters of that series will be marked 4500 and can be paired with a double or triple FD, with the limit screws used to block off the extra positions.
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