Advertise on Bikeforums.net



User Tag List

Page 1 of 2 12 LastLast
Results 1 to 25 of 39
  1. #1
    Senior Member
    Join Date
    Apr 2007
    Posts
    186
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Double fixed hubs.

    It seems like a comical idea because even if you flip your wheel over to a different size cog, you will have too much or too little chain to run the other side, so whats the point. Or perhaps I am missing something here?

  2. #2
    Senior Member
    Join Date
    Nov 2008
    Posts
    459
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    I believe with true track ends, you do have enough lateral freedom to accommodate a one- or two-tooth cog difference.

  3. #3
    :)
    Join Date
    Nov 2006
    Location
    duluth
    My Bikes
    '07 Pista, '09 Fantom Cross Uno, '8? Miyata, '67 Stingray, '0? Zoo mod trials, Tallbike, Chopper, '73 Schwinn Collegiate, '67 Triumph Chopper, '69 CB350, '58 BSA Spitfire, '73 CB450
    Posts
    3,391
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The whole point is that you can run more than one ratio by flipping.

    Or, bugger up the threads on one side and not have to buy a new hub.

  4. #4
    FNG Jabba Degrassi's Avatar
    Join Date
    Nov 2007
    Location
    Toronto, ON
    My Bikes
    2008 IRO Angus, 2008 Jamis Exile 29er
    Posts
    2,313
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If you keep it within 1-2 teeth, you shouldn't have any problems. I have 16t and 17t on mine.
    velospace: Angus | Exile | Jake The Snake

  5. #5
    antisocialite dirtyphotons's Avatar
    Join Date
    Apr 2006
    Posts
    3,385
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    i have a 4 tooth spread on my flip flop with room to spare on my iro's dropouts.
    Quote Originally Posted by Sheldon Brown
    Because when fashion conflicts with function, I vote for function.

  6. #6
    Senior Member
    Join Date
    Jun 2007
    Location
    four 1 OHHH , Maryland
    My Bikes
    nagasawa, fuji track pro
    Posts
    2,588
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by evan811 View Post
    It seems like a comical idea because even if you flip your wheel over to a different size cog, you will have too much or too little chain to run the other side, so whats the point. Or perhaps I am missing something here?
    ride to the velodrome on 48/17 then flip the wheel around and ride 48/14

  7. #7
    Senior Member
    Join Date
    Aug 2008
    Location
    SoCal
    Posts
    2,041
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Jabba Degrassi View Post
    If you keep it within 1-2 teeth, you shouldn't have any problems. I have 16t and 17t on mine.
    Exactly. 14t and 15t for me. Ride hard one day on the flats and the next ya wanna make it easier or it might be really windy, just flip it and make it easier. No chain problems for me. Of course if you are at the end of the track end with the bigger cog and flip it then it might be a problem.

  8. #8
    Senior Member aMull's Avatar
    Join Date
    Aug 2006
    Location
    Toronto
    My Bikes
    Leader 735TR 09 58cm 46/17
    Posts
    1,777
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by evan811 View Post
    It seems like a comical idea because even if you flip your wheel over to a different size cog, you will have too much or too little chain to run the other side, so whats the point. Or perhaps I am missing something here?
    Track ends allow you to move the wheel back or forth for good chain tension. So if the cogs are within 2 or so teeth, you will be able to get correct tension with no problem.

  9. #9
    Senior Member yusuke343's Avatar
    Join Date
    Nov 2008
    Location
    America-48
    My Bikes
    the good kind :)
    Posts
    130
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    i'm running a 13-17 flip flop
    "If I kept count, I'd realize just how dead I should be."-Hickeydog

  10. #10
    Gears? CliftonGK1's Avatar
    Join Date
    Jul 2006
    Location
    Philadelphia, PA
    My Bikes
    '08 Surly Cross-Check, 2011 Redline Conquest Pro, 2012 Spesh FSR Comp EVO, 2009 Spesh Singlecross, 2011 RM Flow1
    Posts
    11,322
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Also gives you the most versatility for a flip-flop since you can run a freewheel or a fixed cog on either side. (Sure, you can run a fixed cog on both sides of a fixed/free hub, but you're sans lockring on one side.)

  11. #11
    Senior Member mihlbach's Avatar
    Join Date
    Dec 2005
    Location
    Long Island, NY
    Posts
    6,342
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by evan811 View Post
    It seems like a comical idea because even if you flip your wheel over to a different size cog, you will have too much or too little chain to run the other side, so whats the point. Or perhaps I am missing something here?
    yes

  12. #12
    Real Men Ride Ordinaries fuzz2050's Avatar
    Join Date
    Sep 2008
    Posts
    3,637
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by CliftonGK1 View Post
    Also gives you the most versatility for a flip-flop since you can run a freewheel or a fixed cog on either side. (Sure, you can run a fixed cog on both sides of a fixed/free hub, but you're sans lockring on one side.)
    A fixed cog, sans lockring is not a good idea, especially since the aim is versatility. I'd get a fixed/fixed, if they were cheaply available.

  13. #13
    Senior Member
    Join Date
    Jun 2007
    Location
    four 1 OHHH , Maryland
    My Bikes
    nagasawa, fuji track pro
    Posts
    2,588
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fuzz2050 View Post
    A fixed cog, sans lockring is not a good idea, especially since the aim is versatility. I'd get a fixed/fixed, if they were cheaply available.
    u dont need a lockring if u are riding at the track.

  14. #14
    Senior Member
    Join Date
    Jul 2008
    Posts
    78
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    wat?
    I can either bike fast, or chew bubble gum, and I'm all out of bubble gum.

  15. #15
    bike bike bike lattanzio's Avatar
    Join Date
    May 2007
    Location
    philly
    My Bikes
    eai bareknuckle, cayne uno beater, raleigh sprite 27 conversion
    Posts
    241
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    yeah i run a 17t on the street and a 15t on the track with no need for additional/fewer chain links

  16. #16
    antisocialite dirtyphotons's Avatar
    Join Date
    Apr 2006
    Posts
    3,385
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by jdms mvp View Post
    u dont need a lockring if u are riding at the track.
    if you show up as a new track racer and you don't have a lockring on your hub, i'd advise keeping your mouth shut about it.

    as to what does and does not fit, let's be quantitative about it.

    1 tooth on a cog engages 1/2 link of a chain or 1/2 inch of chain. but the chain only wraps around half the cog, so 1 less tooth on the cog means 1/4 inch of extra chain.

    that extra 1/4 inch, though, is shared between the sections of chain above and below the chainstay, so the axle only moves 1/8 inch back in the dropout.

    the axle is about .4 in thick, so if your dropouts are 1.4 inches long you can theoretically deal with an 8 tooth difference. in practice you have to account for space for the track nuts to grip and things don't always line up as you'd like them to, but a 4 tooth spread is usually no problem.

    just remember that if you have a rear brake it'll probably not line up and may rub the tire or spokes because the rim's position will have changed along with the axle.
    Quote Originally Posted by Sheldon Brown
    Because when fashion conflicts with function, I vote for function.

  17. #17
    motovation frankenmike's Avatar
    Join Date
    Jan 2007
    Location
    Dover, NH
    My Bikes
    rigid 29er moto, s-works stumpjumper fsr,black fixie,masi roadbike, ugly old hardrock commuter
    Posts
    1,256
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Fixed/free flip flop hubs are a foolish buy IMO seeing as how you can run a freewheel on the fixed threads.

  18. #18
    Senior Member
    Join Date
    Apr 2007
    Posts
    563
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by CliftonGK1 View Post
    Also gives you the most versatility for a flip-flop since you can run a freewheel or a fixed cog on either side. (Sure, you can run a fixed cog on both sides of a fixed/free hub, but you're sans lockring on one side.)
    I beg to differ. A fixed/fixed hub will yield the greatest versatility as one could use 2 fixed cogs, 2 freewheels, or a fixed cog and freewheel. From what I understand, the few threads not utilized by a freewheel on the 'fixed' side aren't a problem.

  19. #19
    your ad here hanjin's Avatar
    Join Date
    Sep 2007
    Posts
    293
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've run a 48/18 and 48/15 on my fuji, with just enough space in the drop outs.
    6,388
    6,232
    Quote Originally Posted by Bike Snob NYC
    Whatís that about? I canít power-walk, but I still have to compete against someone with a 300 watt motor? Total BS.

  20. #20
    Senior Member
    Join Date
    Jul 2008
    Location
    Seattle, WA
    Posts
    71
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by croscoe View Post
    I beg to differ. A fixed/fixed hub will yield the greatest versatility as one could use 2 fixed cogs, 2 freewheels, or a fixed cog and freewheel. From what I understand, the few threads not utilized by a freewheel on the 'fixed' side aren't a problem.
    A fixed/fixed will also allow all those combination, and you will be able to have a lockring for your fixed cogs. Fixed/free, if you run double fixed cogs, one side won't have a lockring.
    Last edited by Plecks; 01-27-09 at 10:06 PM.

  21. #21
    shaken, not stirred. gnome's Avatar
    Join Date
    Aug 2006
    Location
    The Shaky Isles.
    My Bikes
    I've lost count.
    Posts
    2,908
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    I like the double fixed hub. 15t for flats and low wind conditions or 14t for towing a trailer or strong headwinds.

    Provided you're not running a "magic ratio" on a bike with vertical dropouts there should be enough room to swap one side or the other without chain problems.
    Get a bicycle. You will not regret it if you live. ~Mark Twain, "Taming the Bicycle"
    vBulletin: snafu

  22. #22
    ∞mpg SpaceFace's Avatar
    Join Date
    Jul 2008
    Location
    Austin via Houston
    My Bikes
    Nishiki Riviera GT and a Sparton
    Posts
    174
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Croscoe is talking about fixed/fixed.

    And Plecks, it is ill advised to run fixed on the freewheel side. No threads at all for a lockring so too much back pressure and you've got yourself a mess of trouble.

  23. #23
    Senior Member
    Join Date
    Jul 2008
    Location
    Seattle, WA
    Posts
    71
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by SpaceFace View Post
    Croscoe is talking about fixed/fixed.
    For some reason I read it as "fixed/free will offer the greatest versatility". D'oh!

  24. #24
    Senior Member grymg's Avatar
    Join Date
    Oct 2008
    Location
    Fremont, CA
    Posts
    211
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I love my Shimano DA fixed/fixed, merely because of the security if I accidentally strip the threads on one side. But I rarely keep a cog on the non-drive side because of the added rotational weight.

  25. #25
    Senior Member
    Join Date
    Jul 2008
    Posts
    78
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    ^ Really? The weight of a cog that close to the point of rotation is insignificant.
    I can either bike fast, or chew bubble gum, and I'm all out of bubble gum.

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •