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Double derailleur for triple crankset

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Double derailleur for triple crankset

Old 05-13-18, 06:41 PM
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Rkman
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Double derailleur for triple crankset

Hello, my bike has a triple front chainset. I was upgrading to sora, and the double is around 50$ cheaper. I cannot remove the smallest chainring, so I though that I would just set the limit screw at the second ring and then put the cable in then, but then I wondered which front derailleur I should use, the double or triple?
thanks in advance
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Old 05-13-18, 06:49 PM
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Shimano has taken a lot of effort to sculpt their ft der cages to better shift or clear the chain WRT specific ring tooth counts. So if the triple has the same (or nearly so) tooth count differences between the middle and large rings as the double has between it's two rings then the triple der will work pretty well. If not it will work less well.Andy
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Old 05-14-18, 07:29 AM
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Originally Posted by Rkman View Post
Hello, my bike has a triple front chainset. I was upgrading to sora, and the double is around 50$ cheaper.
What is $50 cheaper? The front derailleur or the shifter/brifter?

What is the model of the components you are taking off the bike?
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Old 05-14-18, 09:00 AM
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Apples vs Oranges? 50 bucks less than what dura ace and sora?
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Old 05-14-18, 09:57 AM
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Originally Posted by IslandTimePE View Post
What is $50 cheaper? The front derailleur or the shifter/brifter?

What is the model of the components you are taking off the bike?
The brifter set is 50 dollars cheaper, 120 vs 170. I am taking of shimano acera mtb shifters and derailleurs, 9 speed. The cassette and crank are supported by the sora derailleurs and shifters.
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Old 05-14-18, 09:58 AM
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Originally Posted by fietsbob View Post
Apples vs Oranges? 50 bucks less than what dura ace and sora?
They are both sora r3000, one is double and the other is triple
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Old 05-14-18, 11:27 AM
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Are these Sora flat bar or drop bar shifters?

​​​​​​​John
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Old 05-14-18, 11:50 AM
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Originally Posted by Rkman View Post
The brifter set is 50 dollars cheaper, 120 vs 170. I am taking of shimano acera mtb shifters and derailleurs, 9 speed. The cassette and crank are supported by the sora derailleurs and shifters.
My initial thought would be to go with the Sora triple derailleur and adjust the limit screw as you suggested. But that would just be a guess. Given that it only takes a few minutes to swap the derailleur and do a quick setup so you can test them, I would simply try both and see with works better.

Are you sure you don't need the gear range offered by having the more expensive triple brifter and your small chain ring? $50 would not seem like much to me if I was on a hilly ride and ran out of gears to get me up and over the worst of the climbs.

Last edited by IslandTimePE; 05-14-18 at 11:54 AM.
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