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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 01-25-06, 08:02 PM   #1
FridgeRobot
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Single Speed flip flop hubs

Where can i buy a flipo flop hub that can hold a cassette on both sides?... so essentially a ss/ss hub.
Im trying to make a fixie that can coast. is this possible?
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Old 01-25-06, 08:06 PM   #2
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i didnt know any kind of fixed gear could coast
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Old 01-25-06, 08:08 PM   #3
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OK, I'll bite. I won't comment on the fixie that can coast thing.

Surly makes hubs that can flip flop, and I believe you can attach a freewheel to either side of the hub.

I have a fixed / free Surly hub. I only use the freehub in the woods.
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Old 01-25-06, 08:21 PM   #4
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if it can coast it's not a fixie.

that being said you can put a ss freewheel on a fixed-threaded (cog and lockring) hub.
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Old 01-25-06, 08:21 PM   #5
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it doesn't have to be a ss specific---bmx style freewheels will therad on a fix side of a flip flop hub

edit: ya what dolface said -- I'm slow
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Old 01-25-06, 08:22 PM   #6
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Yes, Surly makes a single speed hub that can take english threaded BMX freewheels on both sides. This is intended for a MTB with 135mm rear spacing. You can even buy a pre-built wheel from QBP that uses this hub. Any LBS can order it for you.

I think to effectively use two freewheels of significantly different sizes, you would need a chain tensioner. Horizontal dropouts I have seen on MTB's don't allow a large range of adjustment for the axle position.
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Old 01-25-06, 08:24 PM   #7
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well thats because they can't but the idea is that since the single speed cassette is on both sides, with two drivetrain crank arms, while back pedalling the left side cassette would lock thus you could slow down your pedalling. The right side cassette would act normal. but since they are both cassettes you could potentially coast. which means you could run longer crank arms without fear of pedal strike.
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Old 01-25-06, 10:02 PM   #8
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good idea in theory, but you forget that when a freewheels lock up when the tire is rotating backwards. that in itself makes me think that this wouldn't work.
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Old 01-26-06, 12:15 AM   #9
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but why
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Old 01-26-06, 12:20 AM   #10
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i have a phil wood flip flop hub on my soma rush...
http://www.philwood.com/Price%20List...eTrackHubs.pdf
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Old 01-26-06, 12:42 AM   #11
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OP: oh, what youre dreaming has been done, its not a very grand scheme at all if you really stop and think about it, just go get a coaster brake hub if you want to coast and brake with your pedals/feet.
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Old 01-26-06, 07:09 AM   #12
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Quote:
Originally Posted by FridgeRobot
well thats because they can't but the idea is that since the single speed cassette is on both sides, with two drivetrain crank arms, while back pedalling the left side cassette would lock thus you could slow down your pedalling. The right side cassette would act normal. but since they are both cassettes you could potentially coast. which means you could run longer crank arms without fear of pedal strike.
nope.

check this out:
http://www.fixedgeargallery.com/2005...eBikeCo-op.htm

what happens is as the rear wheel is moving forward, the left-side drive freewheel engages, pushing the crank forward. dual freewheel bike has the same effect as a fixed-gear, and there's no way to turn it on or off. there's some speculation about building one of these dealies with two different gear ratios, but that would need to be well planned out.
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Old 01-26-06, 07:49 AM   #13
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Quote:
Originally Posted by queerpunk
there's some speculation about building one of these dealies with two different gear ratios, but that would need to be well planned out.
Yeah, this has been discussed before. It will only work with equivalent gear ratios. Also, you'd need at least one tandem crank arm, or else do some pedal spindle finagling. It's an awful lot of work to get a setup like this working. Just get a track hub.
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Old 01-26-06, 12:04 PM   #14
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Quote:
Originally Posted by queerpunk
nope.

check this out:
http://www.fixedgeargallery.com/2005...eBikeCo-op.htm

what happens is as the rear wheel is moving forward, the left-side drive freewheel engages, pushing the crank forward. dual freewheel bike has the same effect as a fixed-gear, and there's no way to turn it on or off. there's some speculation about building one of these dealies with two different gear ratios, but that would need to be well planned out.
that's basically what i was looking for. I just wanted to know if it would work. thank you. and i never thought about the fact that the crank arms lock up when a freewheel is going backwards.
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Old 01-26-06, 12:52 PM   #15
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ok, not to really drag this out any further, but i was thinking last night...

my friend rides BMX, and his bike has some kind of special freewheel that doesn't lock up right away when the wheel is rolling in reverse. i think it's so you can roll out of a trick backwards without being flipped off the pedals or whatever. but i was thinking...what if you put one of those on the left side, and a standard freewheel on the right. you would be able to go forward, and as long as you don't spin back at all after pedalling forward you could freewheel for a bit. if you wanted to slow down, just push back on the pedals, and the left side pawls would finally engage. would that work? and does anybody know what those freewheels are called that can do that?
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Old 01-26-06, 02:42 PM   #16
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That kind of hub is called a freecoaster hub. They have a driver system, not a thread-on freewheel, so only one cog can be mounted at a time.

If it were possible to mount the freecoaster cog on the left, with a normal freewheel on the right (we're using magical fantasy welding to do this, now) it would work the way you described. It would just be a waste of our magical fantasy resources though, since a coaster brake does the same thing.
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