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  1. #1
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    Possible to build a 1x5/6 speed bike on a track frame with 120mm rear spacing?

    Hi all,

    I am new to the bike forums and am looking for some starting points/guides to building a 1x5 or 1x6 speed bike based on a track frameset with a 120mm rear hub spacing.

    I found several guides regarding retrofitting single speeds with internal gear hubs like the Nexus or Alfine, but I fear the weight penalty on the rear wheel is probably too much for what Iím doing, plus itís just too expensive, as Iíd like to keep the cost of my bike relatively reasonable.

    My previous bike was a 2010 Marin San Anselmo Hybrid, a 3x8 speed, where I rode it mostly mid-gears 2x4, but I have found myself downshifting +/- 2 on the rear cog depending on elevation. This led me to think if it is feasible if I can build a 1x5 or 1x6 speed bike that would simulate my riding pattern, 1 shifter, and 1 front brake.

    So, as of right now, I have a standalone frame, and nothing else, what are some wheelsets, hubs, derailleur would I be looking at? This will be my first build Iím attempting, Iím a quick learner, but if need be, I can take it to a LBS to put together Ė Iím more interested in knowing what parts would be compatible with this build. Thanks!

  2. #2
    Rochambo, *****es jhess74's Avatar
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    IB13: Fyxation un-fixes your fixed with 6 speeds with SixFyx, Plus new Leather Goods

    It's not available yet, but that's pretty much what you're looking for, right? I'd get in touch with Fyxation and see if they know when it'll hit the market.

    Otherwise, American Cyclery may have something similar available now, based on their flickr stream:

    https://www.flickr.com/photos/125393...2/14491107164/
    "There's a New Mexico?!" - Montgomery Burns

  3. #3
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    Hi Jhess, thanks for the response - those look promising and quite simple plug and play but not available. So I guess there are no other 5/6 speed freewheel or cassettes that would work with the 120mm spacing today?

  4. #4
    Senior Member JeremyLC's Avatar
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    Quote Originally Posted by xtrykr View Post
    …and 1 front brake…

    If you're freewheeling you need front and rear brakes.

  5. #5
    Fresh Garbage hairnet's Avatar
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    Quote Originally Posted by xtrykr View Post
    Hi Jhess, thanks for the response - those look promising and quite simple plug and play but not available. So I guess there are no other 5/6 speed freewheel or cassettes that would work with the 120mm spacing today?
    I have seen 5 speed freewheels threaded onto the SS side of flip-flop hubs and the spacing was fine.
    You will need:
    derailleur claw - wheel removal might suck
    housing stop

    What kind of bar will you use? There many options for friction shifters.

    Get two brakes, man.
    Quote Originally Posted by Scrodzilla View Post
    I'd rather ride a greasy bowling ball than one of those things.
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    Quote Originally Posted by xtrykr View Post
    Hi Jhess, thanks for the response - those look promising and quite simple plug and play but not available. So I guess there are no other 5/6 speed freewheel or cassettes that would work with the 120mm spacing today?
    The standard back in the day for 5 spd and ultra 6 freewheels was a 120 mm spacing so there is a ton of vintage equipment available. I recommend Campy Record hubs.

  7. #7
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    Awesome, that's a great start, thanks for the suggestions. I'll scour for some parts at the local bike dump.

    As for the two brakes suggestion, alright alright

  8. #8
    I just wanna ride stryper's Avatar
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    Quote Originally Posted by xtrykr View Post
    I found several guides regarding retrofitting single speeds with internal gear hubs like the Nexus or Alfine, but I fear the weight penalty on the rear wheel is probably too much for what I’m doing, plus it’s just too expensive, as I’d like to keep the cost of my bike relatively reasonable.
    Internal Hub Weight vs. Conventional Rear Hub

    Sturmey Archer 5 speed or 8 speed hub for hilly area?

    Soma Iggy 5-Spd 700c Rear Wheel

    Alex X2100 700c Rear Wheel w Sturmey Archer XRD 5 Internal Drum Hub on Sale | eBay

    I'm not sure what you do with your bike, but the 1-2 pound difference shouldn't be a big deal at all. The difference is even smaller if you get one with a roller brake. Price also isn't that much a difference. I'd go to a lbs and give one a try before you rule it out.

  9. #9
    THE STUFFED Leukybear's Avatar
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    Quote Originally Posted by jhess74 View Post
    IB13: Fyxation un-fixes your fixed with 6 speeds with SixFyx, Plus new Leather Goods

    It's not available yet, but that's pretty much what you're looking for, right? I'd get in touch with Fyxation and see if they know when it'll hit the market.

    Otherwise, American Cyclery may have something similar available now, based on their flickr stream:

    https://www.flickr.com/photos/125393...2/14491107164/
    I'm actually excited for this.

  10. #10
    bro
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  11. #11
    Morton Nagrom_'s Avatar
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    Want.
    Quote Originally Posted by seau grateau View Post
    No offense but you're an idiot.
    PedalRoom

  12. #12
    Senior Member GhostSS's Avatar
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    Quote Originally Posted by Leukybear View Post
    I'm actually excited for this.

    +1

    I could dig this.

  13. #13
    Rochambo, *****es jhess74's Avatar
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    Quote Originally Posted by Leukybear View Post
    I'm actually excited for this.
    Agreed - can't wait for it to come out.
    "There's a New Mexico?!" - Montgomery Burns

  14. #14
    Senior Member GENESTARWIND's Avatar
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    I really like that kilo tt, makes me want to do that.

  15. #15
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    Thanks guys for all your input. It seems that what I'm trying to build with the track frame just doesn't seem very feasible, and based on my riding habits, I'm looking for more of a one stop shop for urban commuting and gravel - so it looks like I'm going to pop on over to the cx forum. That said, that Kilo TT is freaking tight! Wish there was more clearance for bigger tires and fenders.

  16. #16
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    Quote Originally Posted by bro View Post
    This looks pretty contrived. Buy a road bike and remove one of the chain rings. And be careful of the chain bouncing off the front.

  17. #17
    Rochambo, *****es jhess74's Avatar
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    Quote Originally Posted by gl98115 View Post
    This looks pretty contrived. Buy a road bike and remove one of the chain rings. And be careful of the chain bouncing off the front.
    You're right. Totally not possible. You've exposed the most insidious scam out there.
    "There's a New Mexico?!" - Montgomery Burns

  18. #18
    Senior Member GENESTARWIND's Avatar
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    It looks simple and clean like it serves a purpose.

  19. #19
    Fresh Garbage hairnet's Avatar
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    Quote Originally Posted by gl98115 View Post
    This looks pretty contrived. Buy a road bike and remove one of the chain rings. And be careful of the chain bouncing off the front.
    It would make a pretty sweet inexpensive criterium bike. nimble track frame and 5/6 speeds sounds pretty great.
    Quote Originally Posted by Scrodzilla View Post
    I'd rather ride a greasy bowling ball than one of those things.
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  20. #20
    Dread Pirate Aerobeard RaleighSport's Avatar
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    Quote Originally Posted by hairnet View Post
    I have seen 5 speed freewheels threaded onto the SS side of flip-flop hubs and the spacing was fine.
    You will need:
    derailleur claw - wheel removal might suck
    housing stop

    What kind of bar will you use? There many options for friction shifters.

    Get two brakes, man.
    What he said, traditional 10 speeds are 120mm rear spacing, often didn't have built in derailleur hangers either so to be honest your project is actually easy as pie OP.
    (Insert your favorite quote here)

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