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tiagra front derailleur with x7 shifter

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tiagra front derailleur with x7 shifter

Old 01-09-11, 02:45 PM
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tiagra front derailleur with x7 shifter

Hi,
I'm building a flat cross bike and I'm using x7 shifters, an x7 rear derailleur and a mtb crankset (42, 32, 22). Unfortunately, there is no way to make an x7 front derailleur fit, but would a shimano tiagra triple work with the x7 shifter? If not, what would work? Thanks
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Old 01-09-11, 04:06 PM
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You might be able to get it to work but it would be less than ideal.

The first problem you'll have is that the Tiagra FD isn't meant to work with a chainring as small as the 42T you have. The curve of the derailleur will end up being a bit off, and this can cause shifting trouble.

The second problem you'll have is that the cable pull for the X.7 shifters is the same as Shimano MTB shifters, but this is different than Shimano road FD's expect. The difference isn't enormous, and you can change the cable pull ratio slightly by fiddling with how you attach the cable to the mounting bolt.

I think you're likely to find that it's hard to get it set up so that it will hit all three rings cleanly, but if you have all the parts, you may as well give it a try.
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Old 01-09-11, 09:31 PM
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Thanks for the initial response. Is there a road derailleur that would work better? Also, I plan on putting a 48/38/28 crankset on the bike to get the gearing closer to cross specs.
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Old 01-09-11, 09:46 PM
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If you set it up as a double, any road derailleur will work. The 48T ring should smooth over the size issue. The pull ratio issue will exist with any Shimano or SRAM road derailleur. I don't know about Campy.

I should say I've never tried what you're suggesting. I went the other direction -- road shifters with a MTB derailleur. That's not supposed to work either, but I was able to get it working pretty well by playing with the cable tension.
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Old 01-10-11, 10:39 AM
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Is a Shimano R453 road triple derailleur essentially the same as the FD-4503 (tiagra)? They look very similar, but of course, looks can be very deceiving in the realm of bike parts.
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Old 01-10-11, 12:14 PM
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That does look very similar, but the Harris Cyclery site suggests that it will work with MTB shifters. (See https://sheldonbrown.com/harris/derailers-front.html. See also, https://sheldonbrown.com/front-derailers.html.) The Harris site says it is optimized for a 52T chainring, but Universal Cycles claims a 50T max, so it might be just what you need. I don't really know.

If the problem you're having is with the bulk of the dual-pull mechanism on Shimano MTB FD's, you may be able to find an older Shimano MTB FD that has a high clamp and only bottom pull design, like the Alivio M-413 (https://techdocs.shimano.com/media/te...9830728361.pdf).
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Old 01-11-11, 09:35 PM
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thanks for the info; very helpful
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