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Shifter-deraileur compatability

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Shifter-deraileur compatability

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Old 06-19-10, 09:55 PM
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es1bkacsur
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Shifter-deraileur compatability

I have a Trek 720 multitrack with Shimano 200CX rear deraileur & 12 to 28 tooth sprocket set that I wanted to convert from twistgrip shifter to lever style. Will Shimano STX M037 rapid fire shifters work with what I have?
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Old 06-19-10, 11:48 PM
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Match the number of gears in the shifter to the number of sprockets on the freewheel/cassette. For example, 7-speed.
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Old 06-20-10, 05:26 PM
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My cassette is a 7-speed & so is the shifter I'm asking about. The reason I ask is that I got a SRAM TRX 7-speed trigger shifter that doesn't work-skips over 2 gears from 1 shift click & stcks in 1st & 2nd-and I'm sure it's a compatability issue because I sent the 1st one I got back as a defect and the replacement was as bad as the 1st one. Point being it seems like there's more to it than simply matching 7 to 7.

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Old 06-21-10, 01:07 AM
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I was going to mention that most SRAM rear shifters are not compatible with Shimano rear derailleurs. However, there are a few SRAM shifters that are Shimano-compatible and it looks like the TRX is one of those.

The original grip-shifters, SRAM TRX, and Shimano shifters should all be interchangable.

I would double-check that you have installed the new shifter and adjusted the rear derailleur correctly.

What do you mean by "stcks in 1st & 2nd"?
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Old 06-22-10, 05:38 PM
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sram uses a 1:1 pull ratio while shimano uses a 2:1 which perfectly explains your problem. I believe the SRAM Attack shifter will work, its an 8 speed shifter, but you can use the limit screw on your rear derailleur to stop the shifter from shifting into a ghost 8th gear
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