Advertise on Bikeforums.net



User Tag List

Results 1 to 15 of 15
  1. #1
    Member AlbaSurf's Avatar
    Join Date
    Oct 2009
    My Bikes
    Fuji Sagres
    Posts
    30
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    What is this bike part?







    The inside part spins one way, and it makes a freewheel-y type clicking sound. But I've never seen anything like this before. I thought freewheels were inside the cassettes... I admit, I'm fairly ignorant when it comes to bicycle mechanics. It can be so confusing.
    -----
    When I see an adult on a bicycle, I do not despair for the future of the human race. ~H.G. Wells

  2. #2
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    25,815
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)
    It's a single speed freewheel. It's used on single speed bikes (obvious huh?) either road, MTB, BMX or cruiser types these days. It is threaded on a freewheel, not freehub, type hub.

  3. #3
    nice idea, poor execution
    Join Date
    Oct 2009
    Location
    West Newton, MA
    Posts
    397
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    That 14 tooth freewheel has a metric thread, and is meant to fit on the smaller side of a flip-flop BMX hub.
    Kevin Duffy, Harris Cyclery, West Newton, MA.
    blog.harriscyclery.com

  4. #4
    Member AlbaSurf's Avatar
    Join Date
    Oct 2009
    My Bikes
    Fuji Sagres
    Posts
    30
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by HillRider View Post
    It's a single speed freewheel. It's used on single speed bikes (obvious huh?) either road, MTB, BMX or cruiser types these days. It is threaded on a freewheel, not freehub, type hub.
    No, not that obvious to me, actually. Except for the fact that, if this is where the chain goes around, then obviously there isn't anywhere for the chain to go if you tried to shift. Does that mean no need for a derailleur?

    What does a "hub" look like? Just a hub.

    I actually have read the Sheldon Brown site on freewheels and freehubs. Still somewhat confused.
    -----
    When I see an adult on a bicycle, I do not despair for the future of the human race. ~H.G. Wells

  5. #5
    Member AlbaSurf's Avatar
    Join Date
    Oct 2009
    My Bikes
    Fuji Sagres
    Posts
    30
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by helicomatic View Post
    That 14 tooth freewheel has a metric thread, and is meant to fit on the smaller side of a flip-flop BMX hub.
    flip-flop?
    -----
    When I see an adult on a bicycle, I do not despair for the future of the human race. ~H.G. Wells

  6. #6
    nice idea, poor execution
    Join Date
    Oct 2009
    Location
    West Newton, MA
    Posts
    397
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Sorry, a "flip flop" hub describes a hub with two sides to mount a freewheel or cog on. see http://www.sheldonbrown.com/singlespeed.html#flip-flop

    Here's what a BMX flip flop hub looks like:

    You can see that the right side threading is a little smaller than the threading on the left, that's the side your freewheel would fit on. Freewheels 16T and larger would go on the larger diameter thread on the left side.
    Kevin Duffy, Harris Cyclery, West Newton, MA.
    blog.harriscyclery.com

  7. #7
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    25,815
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by AlbaSurf View Post
    .... then obviously there isn't anywhere for the chain to go if you tried to shift. Does that mean no need for a derailleur?
    Right, hence the name "single speed". No derailleurs or shifters needed.

  8. #8
    Bikaholic blamp28's Avatar
    Join Date
    Dec 2006
    Location
    Western, Michigan
    My Bikes
    Trek Fuel 90, Giant OCR, Rans Screamer Tandem
    Posts
    1,467
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by AlbaSurf View Post
    flip-flop?
    A hub that has threading on both sides. Some riders use this for a single speed bike with two different sized sprockets so they can "flip" the wheel for better climbing(more teeth) or more speed (fewer teeth) without owning two wheels.
    Trek Fuel XC MTB, Giant OCR Road Bike, Rans Screamer - Tandem

  9. #9
    Senior Member
    Join Date
    Apr 2005
    Location
    Malaysia
    My Bikes
    an old Marin
    Posts
    66
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    yeah.... recently i have purchased a 2-speed Freewheel!!! Old stock and old model made in the land of the Rising Sun...

  10. #10
    me have long head tube TallRider's Avatar
    Join Date
    Oct 2005
    Location
    Chapel Hill, NC
    Posts
    4,097
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by AlbaSurf View Post
    flip-flop?
    or a president who changes his mind not because of learning or principal, but because of political expediency

  11. #11
    Member AlbaSurf's Avatar
    Join Date
    Oct 2009
    My Bikes
    Fuji Sagres
    Posts
    30
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by helicomatic View Post
    Sorry, a "flip flop" hub describes a hub with two sides to mount a freewheel or cog on. see http://www.sheldonbrown.com/singlespeed.html#flip-flop

    Here's what a BMX flip flop hub looks like:

    You can see that the right side threading is a little smaller than the threading on the left, that's the side your freewheel would fit on. Freewheels 16T and larger would go on the larger diameter thread on the left side.
    Thank you! That was a delightfully clear explanation! One more quick question - what is the reason for the different size freewheels? In what circumstances would you want a larger or smaller freewheel and does that then mean you have to change which rims you use?
    -----
    When I see an adult on a bicycle, I do not despair for the future of the human race. ~H.G. Wells

  12. #12
    Member AlbaSurf's Avatar
    Join Date
    Oct 2009
    My Bikes
    Fuji Sagres
    Posts
    30
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by blamp28 View Post
    A hub that has threading on both sides. Some riders use this for a single speed bike with two different sized sprockets so they can "flip" the wheel for better climbing(more teeth) or more speed (fewer teeth) without owning two wheels.
    That is such a cool idea. Kindof bike nerdy, lol, but still cool.
    -----
    When I see an adult on a bicycle, I do not despair for the future of the human race. ~H.G. Wells

  13. #13
    Member AlbaSurf's Avatar
    Join Date
    Oct 2009
    My Bikes
    Fuji Sagres
    Posts
    30
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by shea2812 View Post
    yeah.... recently i have purchased a 2-speed Freewheel!!! Old stock and old model made in the land of the Rising Sun...
    Would you mind taking a picture of it for me? Not the whole bike, just specifically the freewheel part? I'm a visual learner.
    -----
    When I see an adult on a bicycle, I do not despair for the future of the human race. ~H.G. Wells

  14. #14
    Senior Member Homebrew01's Avatar
    Join Date
    Jul 2004
    Location
    Ffld Cnty Connecticut
    My Bikes
    Old Steelies I made, Old Cannondales
    Posts
    15,837
    Mentioned
    6 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by AlbaSurf View Post
    Thank you! That was a delightfully clear explanation! One more quick question - what is the reason for the different size freewheels? In what circumstances would you want a larger or smaller freewheel and does that then mean you have to change which rims you use?
    Different size freewheels (or cogs in general) give different gear ratios. You select the gear that works best for you.

    The rim is the part that the tire mounts on. It really is not relevant to gear selection. However, the hub, as pictured above, must be compatible with the freewheel or cassette being used.
    Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike

  15. #15
    Senior Member
    Join Date
    Mar 2008
    Posts
    4,293
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Homebrew01 View Post
    ..The rim is the part that the tire mounts on. It really is not relevant to gear selection....
    But it is! an X tooth sprocket on a 20" wheel will yield fewer gain inches than the same x tooth sprocket on a 28" wheel.

Posting Permissions

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