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Advice on rear derailleur

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Advice on rear derailleur

Old 05-31-20, 07:29 PM
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Advice on rear derailleur

Hello all! Iím reaching out to the community for advice on a new rear derailleur for my son's bike. I am new to biking and just bought my first bike (since having one as a teenager), a Cannondale Quick CX 3 the other week.

My son just upgraded from a little kids bike to a Trayl Passage 20" 6 speed bike with Shimano gears. I plan on swapping out the grip shifter to a trigger shifter to make it easier for him to switch gears. The particular grip shifter on the bike is very stiff and doesn't move well. From what I found online, other folks have swapped out their Shimano grip shifter with a Shimano TX30 or TX50 trigger shifter. Since I was going to replace the shifter, I figured I would look at replacing/upgrade the rear derailleur.

The current rear derailleur is a Shimano RD-TZ20. I was looking at replacing it with a TX31,TZ50, or TZ500 rear derailleur, but I couldn't find the difference between each one online. Will either of those work in place of the RD-TZ20? Also, if I want to replace the rear cassette freewheel or front freewheel which one or size would I need?

Thanks and stay safe!
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Old 06-04-20, 08:00 PM
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You may not need to replace the derailleur. The cable may be gummed up . I would replace the twist shift with the trigger shift and cable at the same time. Might give you the performance you are looking for.
Never hear of a bike with a front freewheel. You talking about the cassette and chain rings, they are readily available in different ratios. If you are happy with the current ratios, I would count the teeth and replace with the same sized gears.
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Old 06-05-20, 11:54 AM
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I'd try to change the cables and housing first. Easiest and cheapest option. If that fails get the shifter. 6 speed indexing is somewhat unique with 5.5mm spacing so there aren't many options than another 6 speed indexed shifter.
good luck and let us know how it went
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