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Shimano shifter compatibility question

Old 05-10-20, 07:31 PM
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Shimano shifter compatibility question

I'm working on my first refurbish job, turning an old Schwinn Worldsport 14 speed into a 7 speed town bike for my 14 yo daughter. Most of it is pretty straightforward except that I need to change the shifter for the rear derailleur to either a twist or thumb shifter that will work with city bars instead of the drops currently on it. The label is gone from the read derailleur, but I have no reason to think it's not the original, and the current shifter is a stem-mounted index road shifter marked "Shimano 7-speed SIS."

So my question is, how specific do I need to be about compatibility on this? Will any 7-speed twist or thumb index shifter claiming Shimano compatibility work here? Or is it more specific than that? (Please don't tell me I have to replace the derailleur. I'm trying to keep this on the cheap.)

Thanks in advance.
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Old 05-10-20, 07:48 PM
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If the shifter says SIS and works in an index setting then any 7sp shimano compatible shifter will work. But it isn't unheard of for earlier shifters to have a friction setting so it can do friction or indexed and in the friction setting will work with any derailleur. Does the shifter click when you shift or move smoothly.
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Old 05-10-20, 08:05 PM
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Originally Posted by Russ Roth
Does the shifter click when you shift or move smoothly.
Yep. It's a clicky index shifter alright. Funny thing, the front derailleur is friction. That's going to a single chainring, though, so it doesn't matter.
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Old 05-10-20, 08:39 PM
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Originally Posted by stuminnis
Yep. It's a clicky index shifter alright. Funny thing, the front derailleur is friction. That's going to a single chainring, though, so it doesn't matter.
Not so funny, indexing is not much advantage when switching between 2 rings, and trim, if you need it, is built in.
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Old 05-10-20, 08:44 PM
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Originally Posted by dsbrantjr
Not so funny, indexing is not much advantage when switching between 2 rings, and trim, if you need it, is built in.
Ah. That makes sense.
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Old 05-10-20, 09:15 PM
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Originally Posted by stuminnis
Yep. It's a clicky index shifter alright. Funny thing, the front derailleur is friction. That's going to a single chainring, though, so it doesn't matter.
If it indexes then any shimano 7sp shifter should work. Going to single will solve any issues there. Sounds like a good plan, hope the bike and the work is appreciated.
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