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Replacing MF-TZ500-7 cassette
#1
Friend of mine asked me to post this:

"I have one hybrid bike for city commuting with Shimano Tourney 7-speed system and MF-TZ500 cassette that has 14T on the bottom. I'd like to swap it for a cassette with 11T or 12T. Can you suggest any cassette for me and are there any special tools that I need for the cassette replacement process?"
"Carbon is faster"
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#2
Are you sure it is a cassette? or is it a freewheel? Can you post a picture please?
There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
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#3
(09-25-2019, 10:24 PM)Painkiller Wrote:  Are you sure it is a cassette? or is it a freewheel? Can you post a picture please?

Hey, I deleted the first line when posting before, my bad there. Edited it now.
Yes it must be this one (Shimano Tourney TZ freewheel 3x7 speed), freewheel.
"Carbon is faster"
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#4
being that it is a freewheel, your options are limited and the smallest or highest/top speed cog would be a 13t. Your freewheel now would probably be what is called a mega-range. A very large jump in teeth on the final lowest cog. If you are to change the total gearing to say a 13t-28t I would recommend changing the rear derailluer to an Shimano altus 7/8 spd and also a chain with a quik link design to make the new mod all come together nicely. It would run roughly $11 for chain, $20 for freewheel, $20 for altus rear derailluer, $10 for freewheel removal socket. This would be the least expensive option. not knowing what you have up front for rings but going up to a 48t/50t big ring would gain you more top end also, roughly $40 for a suitable crankset swap if the bottom bracket length is correct.
If you feel the absolute need for a 12 or 11t in the rear you would have to replace the wheelset for that accepts a cassette, this would be the more expensive way to go and would maximize your top end speed. here are some links to the first recommended part swap
https://www.ebay.com/itm/Shimano-7-Speed-Freewheel-13-28-7-Spd-Thread-on-Free-Wheel/283070733325?epid=2255631513&hash=item41e8549c0d:g:9REAAOSwY7ZdJO80
https://www.ebay.com/itm/Shimano-Altus-RD-M310-7-8-Speed-Direct-Mount-Rear-Derailleur-MTB-OE/352445884703?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
https://www.ebay.com/itm/KMC-X8-6-7-8-18-21-24-Speed-Bike-Chain-X8-93-116L-fits-Road-MTB-3x6-3x7-3x8/321776364831?hash=item4aeb5dad1f:g:u70AAOSwAjRc9zVa:sc:USPSFirstClass!61604!US!-1
https://www.ebay.com/itm/NEW-Park-Tool-FR-1-3-FR-1-2-Freewheel-Remover-Tool-fits-most-Shimano-SunRace/291546230161?epid=1173678172&hash=item43e1826d91:g:ERgAAOSwd0BV2Oey:sc:USPSFirstClass!61604!US!-1

sunrace also offers freewheels, anybody's guess as to which is better. The Shimano would be at least equal to what you are wanting to replace
There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
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#5
Oh perfect, this is great info - I appreciate it!
Will forward it to my friend, and he for sure will find this very useful.
Cheers!
"Carbon is faster"
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#6
You are welcome, Please post back your results.
There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
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