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5700 Triple FD paired with a Claris Triple STI?

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5700 Triple FD paired with a Claris Triple STI?

Old 05-16-16, 07:59 PM
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Inpd
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5700 Triple FD paired with a Claris Triple STI?

Hi,

I have a bike with a Claris (2400) triple STI and a Claris triple FD. The FD is fine but is a bit finicky and given FD are so cheap I figured I would just change it out.

The best triple I know of is the 5700 triple (the 5800 series no longer comes in a triple). Will the 5700 triple FD pair with the 2400 triple STI?

Thanks in advance.
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Old 05-16-16, 08:39 PM
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I do not know the answer, but you should start with the tooth difference between chainrings the other derailleur is rated for and compare it to what you have. If they are about the same then you have a good chance it will work. Also look at the minimum small chairing size it is intended for.
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Old 05-16-16, 09:58 PM
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Originally Posted by dwmckee View Post
I do not know the answer, but you should start with the tooth difference between chainrings the other derailleur is rated for and compare it to what you have. If they are about the same then you have a good chance it will work. Also look at the minimum small chairing size it is intended for.

Thanks the
5703 FD is rated Top Gear Teeth: 50T, Maximum Capacity: 20T, Chain line 45mm, Chain stay angle 63-66
2403 FD is rated Top Gear Teeth 50T Maximum Capacity: 20T, Chain line 45mm, Chain Stay Angle 63-66

So they are a perfect match. But the 5703 FD literature from Shimano keeps on saying only using with 5703 STI and "10 speed compatible".
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Old 05-16-16, 10:08 PM
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I'd want to know how you think your current front derailleur is finicky. What does it do or not do?
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Old 05-17-16, 01:41 AM
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Originally Posted by Inpd View Post
Hi,

I have a bike with a Claris (2400) triple STI and a Claris triple FD. The FD is fine but is a bit finicky and given FD are so cheap I figured I would just change it out.

The best triple I know of is the 5700 triple (the 5800 series no longer comes in a triple). Will the 5700 triple FD pair with the 2400 triple STI?

Thanks in advance.
Any road triple FD should work fine. I'd look for a FD marketed for lower number of speeds (6 to 8 are wide, 9 is a bit narrower, 5703 10 speed even more so), since it will have a slightly wider cage, minimizing chain rub.

In my experience, Sora and up (Tiagra, 105..) FDs all work fine. Claris FD is not too good, but Sora will be OK.
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Old 05-17-16, 09:39 AM
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Shifter compatibility will probably be fine. I don't think Shimano changed the cable pull significantly on the drop bar shifters until 11 speed. As Slaninar already mentioned, I'd be concerned about cage width if running an 8-speed chain through a 10-speed FD. A Sora 9-speed FD might be a little wider (I run one of these on my 9-speed touring bike and have no problems).

One issue with recent Shimano triple FD's is that they're really sensitive to the tooth difference between the big and middle rings. You need at least an 11-tooth difference (e.g. 50-39) for it to work well, otherwise the lower edge of the inner cage plate will rub against the middle ring when you are shifted to the big ring. You didn't mention what crankset you have, but I believe the Claris 2403 triple crank is 50-39-30, so if that's what you have, it should be fine.

Some touring triples have 48/38 or 46/36 ring combinations, and I've had issues with those when using Shimano triple FDs.
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Old 05-17-16, 12:18 PM
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My crankset is 52/42/30
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Old 05-17-16, 12:59 PM
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Originally Posted by Inpd View Post
My crankset is 52/42/30

Now that I think about it, it's possible that the FD I had issues with was an Ultegra FD-6603, which I believe is designed for 52-39-30 chainrings (13T difference). The 105 triples and below typically are 50-39-30 (or were, since Shimano is systematically exterminating them ). It seems unlikely to me that an FD designed for a 11T difference would have so little tolerance that it wouldn't work with a 10T difference. It might still work, though it might be a little more finicky about the height adjustment.
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Old 05-17-16, 01:26 PM
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Originally Posted by Inpd View Post
My crankset is 52/42/30
Is it a Shimano crank?

I don't think you're likely to get the improvement you want just by switching the front derailleur, unless just by improving the cable tension during the switch. The front derailleur just moves where the shifters tell it to move. The 105 model might be stiffer than the one you have, so maybe it would improve things, but I wouldn't expect a big difference.

If you have a non-Shimano crankset you would likely see an improvement by switching to a 5703 crank (though you'd get smaller big and middle rings) because Shimano has really fine tuned the ramps on their cranks, especially in the upper models. You would also likely see an improvemnt by upgrading the shifters, but that is obviously a more expensive proposition.

BTW, the 5703 front derailleur is designed for a 50-39-30 crankset. If you do decide to try a new FD with the crankset you have, look for a 6703 which is optimized for bigger rings.

Probably your best bet is to make sure your cable routing is smooth and the cable tension is well adjusted.
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