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Old 10-28-07, 06:19 PM   #1
dmitri926
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Could not keep original triple FD for a new compact crankset

Hey all,

I went to the shop to install a new compact crankset, and the mechanic could not keep the original tiagra triple FD. We tried every configuration of HI, LOW screws, moving the FD down as far as possible, tilting it, etc. But we just couldn't get it to shift adequately for all the gears. Then he showed me the 105 double FD and pointed out the differences, the 105 double FD's side walls were smaller in height, and the distance between the walls were smaller as well. When we put it on the bike, it shifted great.

I just want to pass this information on, because i was suggested that changing the FD would not be necessary. However, it seems that in order for the bike to shift without any problems then changing the front FD is indeed necessary.

Anyone have similar experience?
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Old 10-28-07, 06:54 PM   #2
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On some bikes you may be able to get away with using a tripple on a double set up but typically you'll have to switch out to a double FD in order for everything to work like butter.
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Old 10-28-07, 07:36 PM   #3
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If you have a non Shimano compact you will need a compact der. for best shifting.
The Shimano(double) der. works fine with the Shimano compact. The triple not so much.
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Old 10-29-07, 04:45 AM   #4
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May I ask why you went from a triple to a compact?

I've often thought of it myself, but on windy days going up hills...

OTOH, the simplicity of two up front is tempting...
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Old 10-29-07, 06:25 PM   #5
dmitri926
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Quote:
Originally Posted by rodrigaj View Post
May I ask why you went from a triple to a compact?

I've often thought of it myself, but on windy days going up hills...

OTOH, the simplicity of two up front is tempting...
I got a really good deal on a carbon crankset: leopard cycles carbon crankset 50t/34t for 180 on biketiresdirect. Then i also bought a FSA platinum bearing BB, and a 105 front derailleur (for double cranksets).

Let me tell you, this setup completely changed the driving feel of my bike. It has a new-bike-smooth feel. The gearing on the compact is much better suited for me than the triple i had before, 54t/42t/30t. The crank arms are about 3-4 times lighter, much less revolving weight --> more spinning endurance.

My old setup was tiagra FD, low-end FSA BB, low-end FSA crankset. It was a very shoddy and heavy setup. The old bottom bracket was unbelievably crappy and flimsy, i knew it before, but even more so when compared to the new one. Very happy that i switched.

O yea, no chain rubbing against FD. EVER!
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Old 10-30-07, 02:00 AM   #6
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Quote:
Originally Posted by dmitri926 View Post
Let me tell you, this setup completely changed the driving feel of my bike. It has a new-bike-smooth feel. The gearing on the compact is much better suited for me than the triple i had before, 54t/42t/30t. The crank arms are about 3-4 times lighter, much less revolving weight --> more spinning endurance.

My old setup was tiagra FD, low-end FSA BB, low-end FSA crankset. It was a very shoddy and heavy setup. The old bottom bracket was unbelievably crappy and flimsy, i knew it before, but even more so when compared to the new one. Very happy that i switched.

O yea, no chain rubbing against FD. EVER!
you just said the most important things that made me switch over.. the simplicty of the double is beautiful its alot easier to remeber your gear ratios and what not... and not encounter as many drivetrain problems..

i actually find msyelf having more gears available with my compact double... because on the triple so many gears wouldnt work with chainrub and derailleur rub etc.... so it would be very limiting to me on rides.. and everytime i got it re adjusted ... i felt like after a month or so i would need to adjust the triple again
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