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The freewheel is a ratcheting mechanism, that coupled with a set of gears, is that threaded onto the rear hub of a bike. The freewheel allows the rear wheel to engage and move when the pedals are spun forward, but coast freely when the pedals are stationary or spun backwards.

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29" freewheel ruined (slipping)

So, this is a new bike with 7-speed freewheel instead of freehub and cassette? Freewheels and anything 7-speed have been obsolete for about 25 years, certainly far before 29" bikes appeared. … With the new freewheel, it is also possible that the chain is already worn out or out of spec even as new. It is a good practice to always replace the chain when replacing worn cogs. …
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2 votes

What type of freewheel remover do I need for this one

You need the one sold as "BMX" freewheel remover. Usually they have 2 or 4 prongs, the extra slots on this freewheel will just go unused. …
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2 votes
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15T Freewheel Which Works on Flip Flop Hub

The normal freewheel thread is too large for cogs smaller than 16T. One source for the information is Sheldon Brown's singlespeed page. It is a good one to read before buying any more parts. … Fixed/free flip flop hubs have the larger freewheel thread and similar sized thread with lock ring thread on the other side, these do not work with small freewheels. …
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1 vote

Campagnolo Zonda Ratchet sound

New freehubs are quieter, because they have a thicker layer of grease between contact surfaces in the freewheel. …
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6 votes
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What model/make are this Freewheel and Freehub?

It looks like a Helicomatic. Once you know the name, there is plenty of information on the Internet.
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2 votes

What causes frames to break at the (rear) dropouts?

The reason is that in a freewheel hub the drive side bearing is close to the center of the axle. … This could work with a freewheel hub too, but I am not aware of anyone who makes that kind of hub. …
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2 votes

Swap Shimano/SRAM freehub for Campagnolo

Swapping hubs to a complete wheel is almost never practical. You would need a hub that matches the exact drilling of the original hub, or has similar spoke counts if you also replace the spokes. Even …
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1 vote

18 Speed Mountain Bike Single Speed Conversion

You need a BMX freewheel, chain tensioner and a selection of bike tools that will probably cost more than the parts if you can't borrow them. … The singlespeed BMX freewheel goes on the same thread as multi-speed freewheel. The tricky part that might require help from a mechanic is removing the old freewheel. …
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