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I rescued a bike from the trash and want to convert from 7 speed to 9 speed. The biggest sprocket has "Lock Ring Type" printed on, so I assumed it was a 7 speed cassette (and I wanted to see if the free hub is a modern type that fits a 9 speed cassette).

However after taking the wheel out I noticed it looks like a freewheel rather than freehub with cassette. Why does it say "Lock Ring Type" on the biggest sprocket? Is this actually a freehub with a lockring that's unfamiliar to me?

I have included a picture (I removed the axle to have a closer look). Cassette or freewheel

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  • It is bike24.com/p2273122.html
    – Vladimir F Героям слава
    Commented Jul 18, 2020 at 8:41
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    "megadrive" sounds like a knock off of the Shimano MegaRange freewheels with a very large low gear.
    – Criggie ♦
    Commented Jul 18, 2020 at 8:44
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    Pure speculation on my part but perhaps disassembly requires removal of the ring marked "Suunrace M1" using a suitable (but unknown) tool, instead of the typical 2 pin spanner on the more inner ring.
    – mikes
    Commented Jul 18, 2020 at 20:47

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It's a freewheel with some words on it. The tool splines will always spin with the cogs if it's a cassette.

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  • Do you expect the “lock ring type” to just be some nonsense marketing?
    – Superman.Lopez
    Commented Jul 18, 2020 at 13:05
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    I suspect it's some kind of knockoff off the Shimano "Mega 7" design, which used a lockring instead of threaded cogs. sheldonbrown.com/mega7
    – Nathan Knutson
    Commented Jul 18, 2020 at 15:23

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