Two hub questions.
#1
Rhapsodic Laviathan
Thread Starter
Two hub questions.
I want to build a twin chain bike and after about an hour of searching; I cannot find anywhere online to get a twin freewheel hub. Does anybody still make these things? Or if I can find a lht sproket; could a flip flop hub be used?
I've read that some can, some can't, that there's two different thread pitches on the fixed side. I like the look. I know extra drag and blah, blah.
I've read that some can, some can't, that there's two different thread pitches on the fixed side. I like the look. I know extra drag and blah, blah.
#2
Senior Member
There ARE two different threads on a fixie hub, one for the sprocket and one for the lockring. That’s not a problem though as the lockring thread is smaller than the sprocket thread - which is the same as a freewheel thread.
The big thing is that a LHD f/w needs a LH thread, or pedalling action will unscrew it.
One way of doing a mostly-functional double-drive bicycle would be to buy two bmx hubs, one LHD and one RHD. Disassemble, cut in half and reassemble using either an internal or an external sleeve to maintain tolerable alignment. For bonus points, use the discarded ends to make a front hub.
The big thing is that a LHD f/w needs a LH thread, or pedalling action will unscrew it.
One way of doing a mostly-functional double-drive bicycle would be to buy two bmx hubs, one LHD and one RHD. Disassemble, cut in half and reassemble using either an internal or an external sleeve to maintain tolerable alignment. For bonus points, use the discarded ends to make a front hub.
Likes For dabac:
#3
Senior Member
i have two chain bikes, but i'm not sure if it's how you mean it. i have a 3 speed adult tricycle hub in my chainline so my front sprocket goes to it, then goes from there to the back wheel. i'll link a pic from facebook here in a minute.
#4
Senior Member
https://www.facebook.com/photo.php?f...type=3&theater
https://www.facebook.com/photo.php?f...type=3&theater
best pics i could find at the moment (photobucket has all my old pics hostage)
https://www.facebook.com/photo.php?f...type=3&theater
best pics i could find at the moment (photobucket has all my old pics hostage)
#5
Rhapsodic Laviathan
Thread Starter
https://www.facebook.com/photo.php?f...type=3&theater
https://www.facebook.com/photo.php?f...type=3&theater
best pics i could find at the moment (photobucket has all my old pics hostage)
https://www.facebook.com/photo.php?f...type=3&theater
best pics i could find at the moment (photobucket has all my old pics hostage)
Philwood and two other companies make or made them. I can't find any online.
#6
Rhapsodic Laviathan
Thread Starter
There ARE two different threads on a fixie hub, one for the sprocket and one for the lockring. That’s not a problem though as the lockring thread is smaller than the sprocket thread - which is the same as a freewheel thread.
The big thing is that a LHD f/w needs a LH thread, or pedalling action will unscrew it.
One way of doing a mostly-functional double-drive bicycle would be to buy two bmx hubs, one LHD and one RHD. Disassemble, cut in half and reassemble using either an internal or an external sleeve to maintain tolerable alignment. For bonus points, use the discarded ends to make a front hub.
The big thing is that a LHD f/w needs a LH thread, or pedalling action will unscrew it.
One way of doing a mostly-functional double-drive bicycle would be to buy two bmx hubs, one LHD and one RHD. Disassemble, cut in half and reassemble using either an internal or an external sleeve to maintain tolerable alignment. For bonus points, use the discarded ends to make a front hub.
If I can just put a lhd freewheel on a flipflop hub, my search will go a lot easier and all I'll need is to have help building a rear wheel. I already have a bmx 3pc conversion, would just need two sprockets and another driveside arm. A lhd f/w is easier to find, than a dual freewheel hub. I may need to email On Your Left cycles, since they deal with bmx bikes more than any other shop here.
#7
Senior Member
First I wanna say it's a bit amusing seeing your last name and knowing you tinker with bikes. What I'm talking about is side by side, like this; https://s988.photobucket.com/user/su...F1748.jpg.html
Philwood and two other companies make or made them. I can't find any online.
Philwood and two other companies make or made them. I can't find any online.
or maybe try to find a part number for the left side sprocket and see if you can order it (maybe as a replacement from mongoose).
#8
Senior Member
If you want two chains for the looks, it’d be fairly simple to set up a double-sided fixie. Install fixed sprocket on the left side, using plenty of torque and red loctite. Install freewheel on the right.
Another, messier option is to deliberately cross-thread a LHD f/w ono the fixed sprocket side of an aluminium flip-flop hub.
F/h is hardened, aluminium is soft. Run a file around the threads a couple of times to take the diameter down a little first.
Another, messier option is to deliberately cross-thread a LHD f/w ono the fixed sprocket side of an aluminium flip-flop hub.
F/h is hardened, aluminium is soft. Run a file around the threads a couple of times to take the diameter down a little first.
#9
Senior Member
I want to build a twin chain bike and after about an hour of searching; I cannot find anywhere online to get a twin freewheel hub. Does anybody still make these things? Or if I can find a lht sproket; could a flip flop hub be used?
I've read that some can, some can't, that there's two different thread pitches on the fixed side. I like the look. I know extra drag and blah, blah.
I've read that some can, some can't, that there's two different thread pitches on the fixed side. I like the look. I know extra drag and blah, blah.
#11
Ups!
Building two chains with an unknown purpose. The purpose of the chains should be clear to everyone - it is a further high speed compared to the existing one.
In all free-running variants, fixeg gear will always win
In all free-running variants, fixeg gear will always win
#12
Senior Member
You're looking for a lhd or left hand drive hub, haven't seen one in a while but that's the term you're looking for. I can't recall on the few I've seen if the right side of the hub was opposite thread allowing for a dual chain drive or if it was just a lhd flip flop hub which would seem to make more sense. There would be some style factor in running two chains like this but otherwise a pointless device, they would have the be the same freewheel and chainring on both sides or only one is working.
#13
Full Member
Tandems often use hubs with regular threading on both sides. right hand threads on the right side for a standard freewheel, right hand threads on the left side for a threaded disk (old school Shimano) or drum brake (Arai) where you don't need a lock ring because the braking action just tightens up the disk more. Tandem riders don't worry about spinning the disk off when going in reverse. Many single cog freewheels can be threaded on backwards so that would work on the left, backwards so the pawls face the correct direction. I'd use some medium threadlocker. Running a double chain means the left won't be taking all the pedaling force so it's not likely to spin off. FYI, when you put a single freewheel on backwards, the slots for the removing tool will be inaccessible. And then there are the single cog freewheels that never had slots for tools.
#14
Rhapsodic Laviathan
Thread Starter
#16
Banned.
If you want two chains for the looks, it’d be fairly simple to set up a double-sided fixie. Install fixed sprocket on the left side, using plenty of torque and red loctite. Install freewheel on the right.
#17
Rhapsodic Laviathan
Thread Starter
I don't want a fixie. This is for a flat tracker/ratrod build with my DB Drifter1.