Broken cassette?
 

I have a suntour 6speed freewheel on my Miyata. While riding, I noticed some clunking and realized that it was loose. Upon further inspection I found that the teeth holding the freewheel had broken, so the frame is all that's keeping it from coming off completely. How can I fix this?

U did all the hard work already... use a big @ss tubing wrench and un screw that thing off the wheel. If you need more leverage use a pipe or something but pretty much now is the easy part.

Then u need a new freewheel tho.

+1 what Ultraman6970 said. Get a big pipe wrench with teeth and you should be able to take that off. BTW, what you have is a -freewheel- which you already seem to know. The title kinda threw me off. I'm slow today.... A number of places sell them and they should fit the existing hub threading. Try Walmart.com and search for "shimano freewheel." A 6 speed direct replacement is likely to fit in the same space without derailleur limit adjustments if any at all. Around $10 plus S/H and maybe tax.

+1 you need a new freewheel. It's not a cassette, those are two different terms meaning two different things. http://www.sheldonbrown.com/free-k7.html

Good luck getting the old one off.

http://www.walmart.com/ip/Shimano-Fr...Speed/13012506

Would this work with my bike? I'd have to get another freewheel remover if switching from suntour to shimano

I replace Suntour freewheels with that Shimano one all the time, and I usually buy them at Walmart.com.

Walmart has freewheels? too bad they only have 11-28 cassettes.

I wonder if they have tubulars??

Bianchi Girl are u looking for tubular rims?

Just to be clear, which part of the old freewheel am I removing?
Freewheels/hubs are still kind of confusing to me.

A freewheel basically has a core and a shell, and between these two nestles the pawls that engages when you pedal, and slip when you coast,
The core screws on (tightly by pedalling torque) to a threaded portion of the hub, and the shell carries the sprockets. It's the core you've exposed in pic 2.
Yours have spontaneously disassembled the shell from the core (a failure mode I've never seen before), so now you have to remove the core from the hub. As mentioned, they screw on by pedalling torque, hence the other posters mentioning big pipe wrench.
I'd remove the pawls first. They're only held in place by a circlip-looking thingy, and once removed, should create a nice indentation for the pipe wrench to engage with.

freewheels, the one-way clutch mechanism and the sprockets stay together, and are usually replaced as a unit. Freehubs, the clutch mechanism and the sprocket stack (AKA cassette) are treated as separate entities, and replaced individually, as needed.

Probably not. I counted 5 cogs on your old freewheel. The Shimano replacement has 6 cogs. The problem is that a 6 cog freewheel requires a longer axle (126mm vs 120 mm). Judging by where the axle nut was on your old freewheel, I'd guess you have an 120 mm axle (and frame). That's not to say you could not replace the hub's axle, re-dish the wheel and spread the rear triangle. However, that's more than a simple replacement.

Confusing?? Well to add to your confusion u have to find out what is the thread of that freewheel too, i believe nobody mentioned this tiny detail. Well it makes sense since you asked how to take the body of that freewheel out of the hub. The other thing is that the freewheel is not saveable so u need a new (or used) freewheel yes or yes.

Coming back to your confusion... U have french, italian and english threading and probably there are more moving around like french and raleigh, since the wheel is pretty old right now u have to figure it out from the markings in the freewheel u have in there, hubs markings or measuring the thread pitch and diameter which is the freewheel u have to get. The wheel is old so is hard to tell w/o looking at it.

Probably is english anyways.

FastJake's link explains it pretty well. Your freewheel broke & fell apart, so the normal removal process won't work. Freewheel removers are cheap, and you don't need one to install a freewheel (unless you're careless & start to cross thread it), so find a 6-speed and off you go.

I would think a Miyata is English threaded.

edit 6 speed

I've seen that before. it's easy to get off if you clamp the broken freewheel part in a vise. Grab the rim and turn counter clockwise. Like everybody else said, you can't fix it, you need a new freewheel.

The Walmart like by the OP should be fine. I counted carefully and see 6 cogs. There is a difference in the tool used to -remove- the freewheel between Suntour and Shimano. the OP may be advised to purchase one of those as well. E.g. see the Park FR1 tool at http://www.sheldonbrown.com/freewheels.html

But if the only thing the OP wants is to put it on, then the FW is self tightening and needs no tool. One can also install it tentatively first to check spacing and not tighten it yet, and then use some needle nose pliers and gently unscrew the FW off without a tool.

Thanks for all the help guys, I'll let you know how it goes

...

Look close, there is six. I thought it was five at first.