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Is this 7-speed Shimano Cassette a suitable Suntour replacement?

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Is this 7-speed Shimano Cassette a suitable Suntour replacement?

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Old 06-19-10, 03:05 PM
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Is this 7-speed Shimano Cassette a suitable Suntour replacement?

I need advice on replacing a Suntour Powerflo 7-speed Cassette on an old GT Outpost Mountain Bike ... I am not sure if they are supposed to look this way, but the cogs look quite worn to me. See photo below - it's a 12-28. (I already ditched the chain.)




Note that this one had an external lock ring (shown above), which threaded into the INNER diameter of the cassette hub. - I had to remove it using a freewheel removing tool, while holding onto the cogs with a chain whip.



I’m no expert, but I thought all cassettes had a locking COG, that are threaded onto the OUTER diameter of the cassette hub, and removed with two chain whips.

Anyway – I am shopping for a new 7 speed cassette, and I found this one.

Will it fit my existing cassette hub???

(I do understand I need a hyperglide chain as well.)
If it makes any difference, the rear DR is a Shimano Altus.
Your guidance is appreciated!
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Old 06-19-10, 04:28 PM
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From the picture, that looks like a Shimano Body ( or analog), so a Sram or Shimano cassette should fit.
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Old 06-19-10, 10:11 PM
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Thanks FBinNY - - I feel that I can go with the 7-speed replacement from Niagara then. ( I obviously know little about cassettes and thought FW threading into the Inner-diameter of the hub was peculiar.)
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Old 06-19-10, 11:09 PM
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Old Shimano uniglide freehubs had outer threads, which the smallest cog screwed onto; modern hyperglide-compatible freehubs (like yours) have internal threads, which a lockring screws into. http://sheldonbrown.com/k7.html#uniglide

The cassette you linked will fit. Any 7-speed chain will work.

I'm surprised the freewheel removal tool fit. Shimano cassette lockring and freewheel splines are similar, but not exact. Sure you didn't actually use a lockring tool? Maybe Suntour lockrings are a little different than Shimano. Anyway, if you find that the tool doesn't work with the new Shimano lockring, you could just re-use the old Suntour lockring.
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Old 06-19-10, 11:54 PM
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Originally Posted by JiveTurkey View Post
Old Shimano uniglide freehubs had outer threads, which the smallest cog screwed onto; modern hyperglide-compatible freehubs (like yours) have internal threads, which a lockring screws into. http://sheldonbrown.com/k7.html#uniglide

The cassette you linked will fit. Any 7-speed chain will work.

I'm surprised the freewheel removal tool fit. Shimano cassette lockring and freewheel splines are similar, but not exact. Sure you didn't actually use a lockring tool? Maybe Suntour lockrings are a little different than Shimano. Anyway, if you find that the tool doesn't work with the new Shimano lockring, you could just re-use the old Suntour lockring.
That's quite an education there - thank you, JiveTurkey. (I'm well versed in freewheels, but these new-fangled cassettes are a challenge for me).
I used my Park FR5 freewheel tool to take the lock ring off. It fit perfectly. I'll keep it around (with the old lock ring) in case I need it again. Thanks so much !
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Old 06-20-10, 12:41 AM
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Now that I think about it, I've only tried using a lockring tool in a freewheel, not the other way around. The lockring tool seemed a bit too big.
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