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if ever need to convert SS to geared?
If you ever need to convert a SS to geared, can you drill into the frame to make a hole to hold the derailleur (or just mount the hangar on the hub nut)?
If not, what size 3 speed hub would fit a fixie frame? |
I can't think of any bike with a dropout big enough to accommodate drilling out a derailleur hanger. Might be possible to use a hanger that mounts on the wheel axle. But then how you'd fit a geared cassette or multispeed freewheel on a most likely 120mm spaced frame is beyond me.
I believe Sturmey Archer makes a three speed hub for SS/FG bikes. |
Originally Posted by seau grateau
(Post 18209688)
I believe Sturmey Archer makes a three speed hub for SS/FG bikes.
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One alternative, if you have a flip flop hub, how would a chain tensioner mount onto it say you wanted one gear for uphill all the way home and one gear for downhill (direct on axle)?
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Originally Posted by Dr1Gonzo
(Post 18209733)
One alternative, if you have a flip flop hub, how would a chain tensioner mount onto it say you wanted one gear for uphill all the way home and one gear for downhill?
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Originally Posted by seau grateau
(Post 18209738)
A chain tensioner will not work for fixed riding. And it sounds like what you'd be doing is removing the wheel and flipping it every time you want to change? Sounds tedious to me. Here's the hub I was thinking of. You might be able to find a wheel pre-built around it. I recommend Google. The multispeed kit posted above is interesting, I wonder how well it works.
My alternative is to have a freewheel 16T for downhill and a fixed 18T for up, which seems to be the opposite of what most do. |
I was thinking about this. You could go with shimano nexus 3 speed hub. of course you would have to lace rear wheel. Nexus hub is compatible with 120 rear frame size. That is what most fixed frames have.
A friend of mine used all city big block frame and put nexus hub. It looks pretty good. it s not a big hub but at the same time give you 3 speeds so if you doing city riding that would be enough. Nexus hub comes with coaster brake, but it is not to complex to remove it and convert to freewheel. you could also buy Sturmey Archer Thumb Shifter for Shimano Nexus 3-Speed. If interested i could post some pictures. But again this is not my bike so i will have to ask first. |
You can replace the existing hub with a different one, provided it has the same number of spoke holes. You will likely need all new spokes, though, and the cost of rebuilding the wheel might end up putting you over what a whole wheel would cost.
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Originally Posted by seau grateau
(Post 18209816)
You can replace the existing hub with a different one, provided it has the same number of spoke holes. You will likely need all new spokes, though, and the cost of rebuilding the wheel might end up putting you over what a whole wheel would cost.
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Yes, you can do either with any bike.
For a derailleur setup, find an ancient derailleur for a cheap bike like an old Simplex. It may well have a steel hanger with the dropout slot on it. That's what you want. Now Simplex hanger is probably threaded wrong for a modern derailleur. You may be able to correct that with drill and taps. The adjusting screw stop will also be in the wrong location. These hangers were made for many different bikes and derailleurs. I strongly suspect that locating one for say a late '70s Schwinn or any Japanese bike would have the correct threading and stop location. And you can also make one from 6061 aluminum plate. (I suspect finding a local machine shop to give you a scrap would be easy almost anywhere.) I did this many years ago and got a lot of use out it. You could make up a pattern from any modern bike's dropout and just cut it out. Biggest challenge would be the nut on the inside. (It will try to interfere with your cogs and may need to be recessed into the plate.) Not needed if you made it out of steel. Then you could just tap the hanger. Most of the hangers have a screw behind the axle that goes into a fancy nut that fits inside the dropout slot to keep it located properly when the wheel is taken out, It is not essential, just nice. A threaded scrap of aluminum that jammed in the slot would work just fine. Anyway - it's all doable. And for an internal hub like a three speed? Find one with the correct dropout spacing. You do have to think about the geared hub must be nutted tightly enough to transfer the torque to the frame. In other words, dropouts of carbon fiber or soft aluminum may not be up to the job. Steel, no sweat. (A few weeks ago, someone posted about damaging a CF dropout this way. If you want to do this to a non-steel frame, look up that thread. There was some excellent advice there.) Ben |
Buy a road bike instead?
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Originally Posted by 79pmooney
(Post 18209973)
Yes, you can do either with any bike.
For a derailleur setup, find an ancient derailleur for a cheap bike like an old Simplex. It may well have a steel hanger with the dropout slot on it. That's what you want. Now Simplex hanger is probably threaded wrong for a modern derailleur. You may be able to correct that with drill and taps. The adjusting screw stop will also be in the wrong location. These hangers were made for many different bikes and derailleurs. I strongly suspect that locating one for say a late '70s Schwinn or any Japanese bike would have the correct threading and stop location. And you can also make one from 6061 aluminum plate. (I suspect finding a local machine shop to give you a scrap would be easy almost anywhere.) I did this many years ago and got a lot of use out it. You could make up a pattern from any modern bike's dropout and just cut it out. Biggest challenge would be the nut on the inside. (It will try to interfere with your cogs and may need to be recessed into the plate.) Not needed if you made it out of steel. Then you could just tap the hanger. Most of the hangers have a screw behind the axle that goes into a fancy nut that fits inside the dropout slot to keep it located properly when the wheel is taken out, It is not essential, just nice. A threaded scrap of aluminum that jammed in the slot would work just fine. Anyway - it's all doable. And for an internal hub like a three speed? Find one with the correct dropout spacing. You do have to think about the geared hub must be nutted tightly enough to transfer the torque to the frame. In other words, dropouts of carbon fiber or soft aluminum may not be up to the job. Steel, no sweat. (A few weeks ago, someone posted about damaging a CF dropout this way. If you want to do this to a non-steel frame, look up that thread. There was some excellent advice there.) Ben |
Spokes thread into nipples at the rim. When switching to a higher flange hub, you run into the possibility of running out of threads to properly tighten the spokes, or the spokes poking through the rim to your tube. If switching to a lower flange hub, you could run into the opposite problem. So it might work, depending on what hub you have now, but there isn't a guarantee. And again, you're going to have to pay someone to do this for you, so factor that into the cost.
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It's totally possible to do, but I believe you can only fit a six speed cassette at most
Here's a mercier someone converted to 1x5 http://www.pedalroom.com/p/mercier-kilo-tt-16905_1.jpg http://www.pedalroom.com/p/mercier-kilo-tt-16905_8.jpg |
Originally Posted by SCK
(Post 18210331)
Buy a road bike instead?
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Originally Posted by SCK
(Post 18210331)
Buy a road bike instead?
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Just like it makes little sense to convert a road frame with vertical dropouts to SSFG, the same goes for converting a track frame to geared, unless it's an IGH. You end up spending a lot of money and time for less than optimal results.
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