I've not encountered a freewheel like this before. It has no spline or notches. It's from an early 2000s Gary Fisher mountain bike. Last pick isnwhatt what up against bteh freewhel, as there wasn't a cone. Not sure what tool to get or how to remove it. Thanks for any help!

possibly a uniglide cassette-smallest gear unscrews to remove the cluster.need 2 chainwhips.https://www.sheldonbrown.com/k7.html

The center stays motionless when spinning backwards, wouldn't that indicate a freewheel versus a cassette?

Any name or other markings stamped on the hub shell?

Nothing stamped on the freewheel, which is also odd, but the hub itself is a Suntour.

If Suntour very likely a microdrive cassette w/ thread on small sprocket.

8.5.5

So if that's the case, the small sprocket can just be twisted off. Chain whip for the sprocket and something to hold rest of cassette?

That is NOT a Uniglide.

I agree that it is probably a SunTour cassette hub from the late '80's/early '90's. Need to see the rest of the hub shell to be more certain.

These are tough to get spare parts for. Shimano dominated the market then and SunTour was dying.

So what do you think it is then?

There were some freewheels that were designed not to be removeable with a tool - they required destructive removal. Basically you use a hammer and punch to get the bearing race off of there and then everything falls apart.

https://www.parktool.com/blog/repair...uctive-removal

Should be regular English FW threads on the hub though so replacement will be easy.

2 chain whips

Yup and I'm pretty sure that's what we are looking at here.The OP has stated that the center part does not rotate with the cogs and there are clearly visible pin holes on what I am quite certain is the lock ring.
Drive that ring clockwise to remove and the floor will be littered with tiny ball bearings and the entire outer assembly will slip off. The rest can (he said optimistically) be removed with a pipe wrench.

Yup indeed, undo the pin plate and the balls will fall out, in pure Suntour fashion. However, that does not mean it is the way to remove it - first it is important to check whether that first sprocket is threaded.
I find the biggest problem with Suntour freehubs is so many people just remove and replace them that there is too few people to explore their removal and rebuilding

+1
Never seen an U-G with pin spanner holes in the bearing shield/dust cap.

Yes. Before you try the destructive approach, use two chain whips to unscrew the first sprocket. If you have only one chain whip, you can grab a length of chain with a large Vice Grip to use as a second chain whip.

Except removing just the cogs leaves the outer part of the freewheeling mechanism in place and gets you no closer to removing it.

As a follow-up, apparently it just falls out when you turn it over...




tbis is my first time encounting this type of freewheel

And you were saying...

Well, that is interesting. I'm sure I won't live long enough to see everything. Curious to know where the right side bearing cup is. I don't see any sign of it in any of the photos. Did you take any photos before you removed the axle?

8.5.5

There was just the dust cap on the right side, no cone or anything other than a spacer and lock nut. I'm very confused by it to be honest.

your not alone.in 20 some years I have never seen that setup.will bet the small cog still unthreads & separates from a carrier of sorts.pulling the axle may have let the whole unit free.

Way too convenient... it'll never catch on !
P_ _ _ Tool would buy the Patent and kill it.

Barry

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I can't find anything in those links that explains it. A couple of them gave security warnings so I didn't go there.
However, the OP stated it was an early 2000s bike, so unless it was fitted with an older wheel somewhere along the way, I don't think we are looking at Suntour here.
Although it does seem strange that an early 2000s Gary Fisher would have a 7 speed.