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Old 01-03-06, 10:59 PM   #1
mattonabike
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building a fixie

i moved to japan about six months ago. and, since the roads are flat and i'm sick of adjusting my derailer, i've chosen to build a fixed-gear. actually, i'm looking to build something with a flip-flop hub. so, since i live about an hour from the keirin/gan wel pro factory, i think i'll pick up a track frame there. in which case, what do i have to know about bottom-brackets and hubs? i guess the hub just has to be the right width. but does the bottom-bracket have to be a japanese one? any advice would be greatly appreciated.
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Old 01-03-06, 11:06 PM   #2
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also, anyone heard of a flip-flop hub with fixed on one side and free-wheel on the other?
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Old 01-03-06, 11:10 PM   #3
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Check this out.

http://sheldonbrown.com/fixed/index.html

Good luck and have fun. If you find a steal on a 50 cm 3 Rensho over there, PM me
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Old 01-04-06, 01:25 AM   #4
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There is a fixie forum on bikeforums also.
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Old 01-04-06, 07:36 AM   #5
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the irocycles website has a step by step build.
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Old 01-04-06, 09:15 AM   #6
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I think some brand has the trademark on the term "flip-flip" hub, but a few different manufacturers make rear hubs that are threaded on both sides. You could mount a track cog with lockring on one side, and a freewheel single-cog on the other. Or a different fixed cog on both sides. I know Surly makes one of these hubs.
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Old 01-04-06, 09:21 AM   #7
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1. Read through sheldonbrown.com and get back to us.

2. Track frames have track geometry and sometimes not front brakeholes. They are more responsive and fun to ride, but some find them twitchy. Limited fender options. If you want a front brake with a undrilled fork, you'll need a drum-brake front wheel.

3. You can run a freewheel on a fix-fix hub. The cog and freewheel threads are the same pitch. Putting a freewheel on a fix threading simply bypasses the lockring threads and uses the cog threads. I've never heard of anybody having a problem doing this. Plus, it give you the option of having two fixed gearings.

4. Lastly, I've ONLY ONCE EVER met somebody who, having the option of fixed of freewheel singlespeed, actually rode the freewheel. It was because their fixed ratio was stupidly high and they were going up hills. Fixed is mo' fun.
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Old 01-04-06, 10:09 AM   #8
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try the fixed and SS forum, they will be able to answer ALL your questions.

i don't know about the BB question but i know the rear hub spacing is 120mm.

as for types of hubs, yes you can find hubs that are fixed/fixed and you can also get fixed/free, but like said above, a lot of keirin frames aren't going to have holes for brakes, so running SS isn't an option, and many would say that it would be a disgrace to put a fixed/free hub on a keirin frame anyway!

keirin frames are racing frames and therefore regulated by the NJS, so are a whole bunch of parts. as far as i know pretty much any part you find that is NJS approved is going to fit your bike.

but once again, head over to the fixie forum
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Old 01-04-06, 10:11 AM   #9
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Quote:
Originally Posted by genericbikedude
2. Track frames have track geometry and sometimes not front brakeholes. They are more responsive and fun to ride, but some find them twitchy. Limited fender options.
This is why every time I get a jones to make a new fixie, I get a road bike with the geometry I want and convert it over. I don't like the feel of a track bike on the street. I suppose if I had long, flat, smooth, dry, leafless roads I might like it better, but for practical reasons a road frame is what a lot of people choose...most people in my own experience. Not to mention the brake and fender issues.
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Old 01-04-06, 10:21 AM   #10
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^^^I am addicted to track geometry--at least in fork rake and tube angles. Not so much with traditional track stem drop or handlebar style though. If I can ever afford a custom road bike, I'd want it to have 75 degree head and seat tubes, and no more than 25degrees rake. Its lively! Quick turns and stops, pothole and cab dodging on them is great. For comfort? Flip the stem and get a brooks.
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Old 01-04-06, 10:25 AM   #11
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Quote:
Originally Posted by genericbikedude
For comfort? Flip the stem and get a brooks.
Flip the stem???

But then the quill would stick up in mid-air and not be inside my fork!!!

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Old 01-04-06, 10:25 AM   #12
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Quote:
Originally Posted by mattonabike
i moved to japan about six months ago. and, since the roads are flat and i'm sick of adjusting my derailer, i've chosen to build a fixed-gear. actually, i'm looking to build something with a flip-flop hub. so, since i live about an hour from the keirin/gan wel pro factory, i think i'll pick up a track frame there. in which case, what do i have to know about bottom-brackets and hubs? i guess the hub just has to be the right width. but does the bottom-bracket have to be a japanese one? any advice would be greatly appreciated.

also, anyone heard of a flip-flop hub with fixed on one side and free-wheel on the other?
Track frames are not ideal for this application, though they're certainly fashionable. The geometry isn't so hot for road use, especially if there are any bumps or potholes. They also lack clearance for fenders, and installing brakes is liable to be difficult.

I have a great deal of material on this general topic on my Website at http://sheldonbrown.com/fixed

Flip-flop hubs are usually set up as you describe, fixed on one side, freewheel on the other side, but it's actually better to get a double fixed hub if you can find one. That gives you the option of using two different sizes of fixed sprocket.

Then, if you decide you want to install a freewheel or two, the "fixed" threading is no problem, since a freewheel can be screwed right on to any standard fixed-gear hub.

Sheldon "Fixed Is Fun" Brown
P.S. Japanese bikes use standard ISO/English bottom brackets, no problem interchanging parts.

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Old 01-04-06, 10:44 AM   #13
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In my haste to laud the virtues of track frames, I forgot the OP. If you DO get a Keirin frame, the headset will likely to be JIS, which is different from ones that are readily available in the states (though they can be gotten).

Get your crank first, and get whatever BB goes with your crank for the desired chainline (42mm with normal track hubs).
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Old 01-04-06, 10:47 AM   #14
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Quote:
Originally Posted by sch
There is a fixie forum on bikeforums also.
Steve
mattonabike:

If you want straight answers to your question, stay here....
Have you thought of just purchasing a complete track bike? Suzue hubs are threaded on both sides so you can go either fixed/fixed or fixed/free.

Anyway, where in Japan are you located? I grew up in Yokohama...

Last edited by roadfix; 01-04-06 at 11:01 AM.
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