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Tiagra Brifter w/ Cyclone FD?

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Tiagra Brifter w/ Cyclone FD?

Old 08-17-10, 09:19 PM
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boatsinbottles
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Tiagra Brifter w/ Cyclone FD?

Will a Tiagra brifter be able to shift a Suntour Cyclone FD ok or do I need to upgrade my FD to a modern Shimano to mate with the Tiagra?

The bike in question is my new commuter - Nishiki International - upgraded to 9 speed rear (still using the original Cyclone RD to friction shift).
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Old 08-18-10, 10:23 AM
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Probably not. Sun Tour and Shimano used different rd geometry, cable pull and cassette spacing for their index shifting so a Sun Tour rd is unlikely to work with any Shimano brifter.

I'd give it a try and we may be both pleasantly surprised but my money says you need a current Shimano rd for the indexing to work properly.
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Old 08-18-10, 12:15 PM
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Thanks, Hillrider. I'm actually planning on upgrading the RD; it's the FD that I am trying to preserve. Do you think it (the FD) will "play nicely" with the Tiagra shifter lever?
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Old 08-18-10, 02:44 PM
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Originally Posted by boatsinbottles View Post
Thanks, Hillrider. I'm actually planning on upgrading the RD; it's the FD that I am trying to preserve. Do you think it (the FD) will "play nicely" with the Tiagra shifter lever?
Hmmm, it might help (and save some typing) if I had read what you really asked first.

Actually, the same advice applies, I don't think it will work but I'd try it before buying the replacement fd. If the crank is a double, you have a better chance since doubles are almost binary. If it's a triple, I think the odds are against you.
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Old 08-18-10, 03:50 PM
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So you're going to continue shifting the RD with a friction shifter? I'm not sure, but I'm going to guess that Suntour FDs pulls a different amount of cable than Shimano.

What sort of friction shifter are you using for the RD? If you're mounting a rear brifter, but not using it, I suppose you could use the rear brifter to shift the FD. I've used a Suntour Command indexing rear shifter to shift a Shimano triple FD, successfully. That's a little different, since I didn't have to flip a paddle multiple times to do one shift.

But I guess I would just use a friction shifter for the FD, and not bother my head over the brifter.
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Old 08-18-10, 04:26 PM
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Try it first. The odds are that it will not work. You need shimano front road der to work with the brifters. Even their own mountain front der.s won't work with road brifters. Different cable pulls.
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Old 08-19-10, 02:08 PM
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I think the suntour FD upshifts the wrong way. Shimano FD rests ( without cable tension ) on the inner ring. I recall suntour rests on the big ring. This causes the big push of the STI to go the wrong way and the release click of the shifter to go the wrong way as well with suntour.
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Old 08-19-10, 04:07 PM
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Originally Posted by claymcfayden View Post
I think the suntour FD upshifts the wrong way. Shimano FD rests ( without cable tension ) on the inner ring. I recall suntour rests on the big ring. This causes the big push of the STI to go the wrong way and the release click of the shifter to go the wrong way as well with suntour.
Sun Tour did make a few "high normal" front derailleurs but they were the exception, most of their models were "low normal". Even so, it would just reverse what the levers on the brifter do and they would still work as well, or as badly.
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Old 08-19-10, 06:13 PM
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Originally Posted by davidad View Post
Try it first. The odds are that it will not work. You need shimano front road der to work with the brifters. Even their own mountain front der.s won't work with road brifters. Different cable pulls.
That's what I think too. If you already own parts, try them and see what happens. That's the only way to know for sure. If you are buying parts, however, always hold out for stuff that matches.

In this case, even a Shimano front derailleur that pre-dates front index shifting won't work. Heck, even matching parts can sometimes be a pain to get adjusted. I wouldn't bet anything on an old Suntour derailleur workking.
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