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How To Set Up a Triple Shifter for a Double Crankset

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How To Set Up a Triple Shifter for a Double Crankset

Old 11-12-18, 03:13 PM
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roccobike
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How To Set Up a Triple Shifter for a Double Crankset

I'm working on a Fuji road bike for a local bike charity. We replaced the broken, 7 speed rear wheel with a nearly identical wheel, that's set up with a 8 speed casette. I have a set of old 8 speed SORA brifters in my spare parts bin I'd like to put on the bike to upgrade it to 8 speed. These are very similar to today's Claris shifters. My question is, the SORA left shifter is a triple, and the bike has a double crank. First question, will use of this brake/shifter work out or are they prone to breaking when used with a double? Second question, assuming it's not prone to breaking, should I set it up using the 1-2 shift or the 2-3 shift?
Thanks for your input.
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Old 11-12-18, 03:48 PM
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It will work with a caveat or two. IIRC you set up the shifter using the 1-2 shift points. The ft der's limit screw will control the der's movement but the lever will be able to continue to the 3 point if the rider is overly aggressive or just mad. This is the problem 1- it will cause the shifter to become trapped at the 3 position, the cable will be so tight that the shifter internals won't be able to release easily back to the 2 point. 2- the cable will be under a lot of tension and can fail sooner where it's out of sight in the shifter.

So while not optimal it works well enough to have been speced as OEM by some brands back a while ago. But there were enough issues that these brands stopped specing the triple shifter for the double cranks soon. Andy
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Old 11-12-18, 03:49 PM
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First let me say that I've never done it. My general philosophy is that if I'm buying parts, I'll only pay for parts that are designed to work together. If I already own parts, however, I'll bolt up almost anything and see if I can get it to work to my satisfaction.

Shimano shifters for 9-speed are the exact same part number whether for a double or triple crankset. I used to own a 9-speed road bike with a double crankset and a 9-speed tandem that had a triple. The Ultra shifters on both bikes actually had 4 shift positions. On the double I had 2 shift positions for each chainring so I was able to trim the front shifting depending on which rear cog I was in. The triple crankset tandem had one shift position for the granny, 2 for the middle ring and 1 for the big ring. I had Flight Deck gear indicating computers on both bikes which always indicated the appropriate chainring so I know that I had them set up the way that Shimano intended.

If I were setting up your bike I think that I'd start with the derailleur just barely clearing the chain in the lowest gear position. Assuming your shifter has 3 shift positions, my bet is I could get it to give me a trim position shifting in either direction. Good luck!
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Old 11-12-18, 05:55 PM
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As I understand it, you'll have an unused position.

If that position is on the tight side and the shifter is forced there, it won't cause the cable to break in the shifter (that's from fatigue), but it's likely to damage the shifter when the cable is released.

If the unused position is on the loose side, it's easily reached and could confuse the rider at first, and again if it goes out of adjustment.
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Old 11-12-18, 07:25 PM
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Thanks for the input. I figured I should leave the shifter so that one side was loose when overshifting rather than let it overtighten. So that's the way I'll go.
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Old 11-12-18, 08:08 PM
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Originally Posted by roccobike View Post
Thanks for the input. I figured I should leave the shifter so that one side was loose when overshifting rather than let it overtighten. So that's the way I'll go.
This is my approach as well. If the rider can jam the shifter if they forget, they will do just that.
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