Tiagra 4700 Front Shifter

[Arthur60]

Thanks. If I tension the cable to get some actual movement on the low trim selection (first click) on the small lever, then if you change up to the outer chain ring, the trim function movement here is very minimal.

As said my old bike with sora FD and shifters, once I initially it up, has worked brilliantly without much adjustment. This Tiagra set seems a little more finicky.

 

[Ajax Bay]

You may find @wafter's info useful if you're concerned the STI is not functioning correctly. You can check how much your STI is pulling, each click.
https://www.cyclechat.net/threads/t...lleur-ratio-shifter-cable-pull-thread.302236/

Shifter: Shimano Tiagra SL-4700 (2x10sp road) - Cable pull per shift - 4.5mm
Derailleur: Shimano GRX FD-RX400 (2x10sp road/gravel) - movement ratio 1.4:1

 

[Shearwater Missile]

Thanks. If I tension the cable to get some actual movement on the low trim selection (first click) on the small lever, then if you change up to the outer chain ring, the trim function movement here is very minimal.

As said my old bike with sora FD and shifters, once I initially it up, has worked brilliantly without much adjustment. This Tiagra set seems a little more finicky.

I agree, the Tiagra does seem more picky as to set up. What you said in that first statement is what I have found. I run two other bikes, one with Sora R3000 and the other 105 5800. The Sora I upgraded from 3400. The 3400 was easier to set up. When I fitted the R3000 it was a beggar to get right without any chain rub. In the end I had to open out the FD slightly, not an easy task but at least it is perfect now. The 105 by comparison was easy to set up and never has been a problem. I know I said in an earlier post about changing the cable routing. That worked for me on the Tiagra. My take on the matter is that there seems to be less tolerance on the newer incarnations of the Shimano running gears. If a cage is slightly wider than it needs be does it matter ? As long as you get the shift when you want the shift that is all that matters. Think about it. In the old days with friction shifters you`d always go past the the ideal point for the FD and then come back for silence of the chain rub. There should be no difference really with STI shifters if there was a greater tolerance of the FD cage.

 

[raleighnut]

I agree, the Tiagra does seem more picky as to set up. What you said in that first statement is what I have found. I run two other bikes, one with Sora R3000 and the other 105 5800. The Sora I upgraded from 3400. The 3400 was easier to set up. When I fitted the R3000 it was a beggar to get right without any chain rub. In the end I had to open out the FD slightly, not an easy task but at least it is perfect now. The 105 by comparison was easy to set up and never has been a problem. I know I said in an earlier post about changing the cable routing. That worked for me on the Tiagra. My take on the matter is that there seems to be less tolerance on the newer incarnations of the Shimano running gears. If a cage is slightly wider than it needs be does it matter ? As long as you get the sh,ift when you want the shift that is all that matters. Think about it. In the old days with friction shifters you`d always go past the the ideal point for the FD and then come back for silence of the chain rub. There should be no difference really with STI shifters if there was a greater tolerance of the FD cage.

Are you sure they're not designed with a slightly thinner chain in mind, how many gears on the rear block

 

[Shearwater Missile]

Are you sure they're not designed with a slightly thinner chain in mind, how many gears on the rear block

They are indeed designed with thinner chains but I only of course use the correct speed chain on each set up. All I am saying is perhaps there is not so much leeway these days for errors, if you get my drift.

FWIW I maintain all of my bikes and what I have mentioned are my observations in the hope of helping the OP.

 

[Gunk]

Thanks.

Think it is the tension, trying balance some kind of movement when down on the small chian ring, without over tensioning so that it causes issues when trying to trim on the largest chain ring.

As said when on the smallest chain ring, to get any noticeable movement on the front derailleur you do have to push passed the first click on the shifter.......my old bike with sora shifters each click with the trim you get a noticeable amount of movement.

Is the front mech definitely compatible with the Brifter?

 

[wafter]

You may find @wafter's info useful if you're concerned the STI is not functioning correctly. You can check how much your STI is pulling, each click.
https://www.cyclechat.net/threads/t...lleur-ratio-shifter-cable-pull-thread.302236/

Do take that with a pinch of salt though since it's the only source for these values. It would be good to have it corroborated by others!

 

[Arthur60]

Think this is definitely cable tension related.......had a cycle tech check the bike......shifter and everything is fine.... but setting up the tension is the key.

His advice was to ride it, let things bed in, then see which trim position is of most benefit to my style of riding, and adjust from there.....

Obviously I don't expect a clear chain run on largest to largest and small to smallest.

At present I've set it to a compromise where on the rear cassette I can use third down from the largest on the large chain ring, and third up from the smallest when on small chain ring without any chain rub on the FD.

I really appreciate everyone's advice. Thanks.