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Old 09-12-2008, 12:19 AM
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Dan Dan is offline
Join Date: May 2008
Location: Moosylvania
Posts: 11,850
Default Re: HT "80cc" Horsepower?

Originally Posted by BCD View Post
Too bad someone doesn't reverse engineer a 3 speed hub to work off the "other" side and we'd all have 3 speeds to play with. all internal, shift at a stop... Ahem... I'm sure that no one HERE is good enough to do that... (maybe someone a whole lot smarter than me will take this up as a challenge and my diabolical plan will be a success... MUHAHHAHAAHAH)
Hi BCD, this is about a flip flop hub. but Spad said BMX chain is not a good choice. But the sprocket could be fixed to the wheel sprocket or vice verca with the right equipment;

Flip-flop Hubs

Flip-flop, or double-sided hubs are threaded on both sides. Usually one side has a track-type threading, (with lockring) and the other side is threaded for a single-speed standard freewheel.

The usual way to use a flip-flop hub is to have a fixed gear on one side, and a single-speed freewheel on the other. The freewheel sprocket would be larger than the fixed sprocket, providing a lower gear.

You would use the fixed-gear side for most pavement riding, and save the freewheel for off-road use, or for getting you home when you are tired. Having the freewheel larger than the fixed sprocket gives you a lower gear when you are using the freewheel. This makes it easier to climb. Since you can coast when you are using the freewheel, the lower gear is no disadvantage on the descents.

Single-speed freewheels are commonly used on BMX bicycles, most shops that deal in BMX parts should stock them. The common size used for BMX is 16 tooth, but 17, 18, 20 and 22 tooth freewheels are available.

Note, there are two types of hubs called "flip-flop":

Fixed/free, this is the type I speak of above, with a "track" side and a freewheel side.
BMX type...BMX flip-flop hubs have two different freewheel threads, a standard one on one side, and a special smaller-diameter freewheel thread on the other, designed to work with special small freewheels (14, 15 teeth.) These are now quite rare, but if you are calling around looking for "flip-flop" hubs, make sure you get the right kind.
Singlespeed Bicycle Conversions by Sheldon Brown
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