Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-10-07, 10:23 PM   #1
irideacenturion
Senior Member
Thread Starter
 
irideacenturion's Avatar
 
Join Date: Mar 2007
Location: Seattle
Bikes:
Posts: 272
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Multi-speed fixed gear

I accept that this may be the dumbest thing that some of you have laid eyes on (though i doubt it considering some of the content on here), but I was just thinking about this...

Say such a thing existed as a fixed hub with a 9-speed cassette on it. Couldn't you theoretically have a multi-speed fixed gear? Does a derailleur need to be used with a freewheel or freehub to work?

I can't say I'd ever want such a device as it'd kind of be the worst of both worlds (no coasting, loss of simplicity of a SS drivetrain), but in theory could this work?
irideacenturion is offline   Reply With Quote
Old 08-10-07, 10:37 PM   #2
BRANDUNE
All around nice guy
 
BRANDUNE's Avatar
 
Join Date: Apr 2007
Location: Sunny Seattle
Bikes: THE KIND WITH TWO WHEELS AND ONE GEAR
Posts: 1,742
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Sturmey Archer has multigeared fixed hubs......................I think
BRANDUNE is offline   Reply With Quote
Old 08-10-07, 10:38 PM   #3
remorashadow
Senior Member
 
remorashadow's Avatar
 
Join Date: Sep 2006
Bikes:
Posts: 149
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The first time you applied any back pressure on the pedals, you would completely mess up the derailleur and probably have a terrific crash.

I'm really tired so I will let other people talk about internal geared fixed hubs.
remorashadow is offline   Reply With Quote
Old 08-10-07, 10:39 PM   #4
TreeUnit
Guy on a Bike
 
TreeUnit's Avatar
 
Join Date: Mar 2006
Location: C-Bus
Bikes: Chromoly Univega with Nexus Hub
Posts: 249
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm acctually planning to build a three speed fixie. It will have a front derailleur and three front chainrings, and a Singleator to pick up the slack chain. I saw one like it on velospace a while back, and have been unable to find it since.

Sturmey archer acctually produced a three speed internally geared fixie, but they do not anymore.

According to sheldon brown, a "Fixed cassette" multi speed fixie wouldn't work because when you backpedal, the derailleur arm will simply bend back.

Somewhere on the net there are instructions to make a two speed fixie from a three speed hub, but apparently it is very difficult to do this.
TreeUnit is offline   Reply With Quote
Old 08-10-07, 10:40 PM   #5
Dersu Burrows
Senior Member
 
Join Date: Sep 2005
Location: Chicago
Bikes: Trek 520, Fuji Track, Vicini Road
Posts: 190
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
When I was at UBI, there was this dude who had a rear hub that was an internal 5 speed hub converted to a 3-speed fixed gear. He had a grip shifter mounted on the end of his bullhorn bars. It was crazy. The owner of the bike did not do the conversion himself so I have no idea how it was done.

The 9 speed cassette thing wouldn't work though because different sized cogs need different chain lengths, thus needing a derailler to take up the slack.
Dersu Burrows is offline   Reply With Quote
Old 08-10-07, 10:41 PM   #6
Landgolier
THIS SPACE FOR RENT
 
Join Date: Jan 2006
Bikes:
Posts: 2,849
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Think about it. As soon as you stop pedaling, or even soft pedal a little, the rear gear is going to start throwing chain at the front, and pretty soon the RD is going to get pulled straight, introducing slack up top, and the whole thing is going to foul. If you don't believe me, go ride an old schwinn with a shimano FF setup with a fodangled front freewheel.

There are multispeed fixed hubs, both an old S-A model that there have been rumors of reviving and then various mods to existing internal gear hubs. Search on here or google and you'll find a ton about them.
Landgolier is offline   Reply With Quote
Old 08-10-07, 10:49 PM   #7
Landgolier
THIS SPACE FOR RENT
 
Join Date: Jan 2006
Bikes:
Posts: 2,849
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by TreeUnit View Post
I'm acctually planning to build a three speed fixie. It will have a front derailleur and three front chainrings, and a Singleator to pick up the slack chain. I saw one like it on velospace a while back, and have been unable to find it since.
I remember seeing that too, I think on here or FGG as I never look at velospace. I think it was a 2 speed, I wouldn't think you could get enough teeth difference to make a 3 speed worth it.

I would expect this to ride really weird, even in the largest gear you're going to need to have a ton of slack or it won't shift, then in the lower gears it's going to be so much slack it won't even feel like fixed unless you try to stop pedaling for like a quarter rotation.
Landgolier is offline   Reply With Quote
Old 08-10-07, 10:50 PM   #8
Sizzle-Chest
The Brutally Handsome
 
Sizzle-Chest's Avatar
 
Join Date: Jun 2007
Location: Siberia
Bikes:
Posts: 508
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
"You cannot use a derailer on a fixed gear bike, even as a chain tensioner, because when you resist the rotation of the pedals, you would bend the derailer." Sheldon Brown
Sizzle-Chest is offline   Reply With Quote
Old 08-10-07, 11:20 PM   #9
irideacenturion
Senior Member
Thread Starter
 
irideacenturion's Avatar
 
Join Date: Mar 2007
Location: Seattle
Bikes:
Posts: 272
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Right...I figured there was a catch. That was just my "it's been a long day" sort of wandering thought that I didn't think through too well.
irideacenturion is offline   Reply With Quote
Old 08-11-07, 02:19 AM   #10
Sammyboy
The Legitimiser
 
Sammyboy's Avatar
 
Join Date: Jul 2005
Location: Southampton, UK
Bikes: Gazelle Trim Trophy, EG Bates Track Bike, HR Bates Cantiflex bike, Nigel Dean fixed gear conversion, Raleigh Royal, Falcon Westminster.
Posts: 4,847
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
But as has been mentioned, there is an ultra rare, and VERY expensive, vintage Sturmey Archer fixed 3 speed hub. And there've been moves here previously to hassle SA into reissuing it, or creating a new one.
Sammyboy is offline   Reply With Quote
Old 08-11-07, 02:27 AM   #11
kemmer
*****es love tarck
 
kemmer's Avatar
 
Join Date: Apr 2006
Location: Sandy, UT
Bikes: so many
Posts: 3,302
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A vintage SA three speed fixed and a regular SA track hub sold together on ebay for 900 bucks recently. You can probably still find the ended auction but I'm way to tired to search for it.
__________________
kemmer is offline   Reply With Quote
Old 08-11-07, 05:36 AM   #12
bbattle
.
 
bbattle's Avatar
 
Join Date: Aug 2005
Location: Rocket City, No'ala
Bikes: 2014 Trek Domane 5.2, 1985 Pinarello Trevisio, 1991 Colnago Master, '06 Bianchi San Jose, 1987 Moulton Fuso, 1990 Gardin Shred, '82 John Howard(Dave Tesch)
Posts: 12,557
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Surly and possibly others sell a Dingle, a dual cog that would give you two manually shifted gears. You can combine it with matching chainrings up front so when you change cogs you also change chainrings, thereby keeping a perfectly straight chainline. Just shifting the cogs would still leave the chainline in good shape, though.

Rivendell's Quickbeam does this, in effect giving you four gears. You need slanted dropouts for this or you'll have to adjust your rear brake, assuming you have one.

Last edited by bbattle; 08-11-07 at 12:39 PM.
bbattle is offline   Reply With Quote
Old 08-11-07, 06:35 AM   #13
bward1028
Guest
 
Bikes:
Posts: n/a
Mentioned: Post(s)
Tagged: Thread(s)
Quoted: Post(s)
Quote:
Originally Posted by TreeUnit View Post
I'm acctually planning to build a three speed fixie. It will have a front derailleur and three front chainrings, and a Singleator to pick up the slack chain. I saw one like it on velospace a while back, and have been unable to find it since.
surly specifies very clearly that you cannot use the singleator with anything other than a freewheel. sounds like a good way to destroy it.
  Reply With Quote
Old 08-11-07, 12:53 PM   #14
theetruscan
Senior Member
 
theetruscan's Avatar
 
Join Date: Aug 2007
Bikes:
Posts: 386
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ira Ryan built up a two-cog, two-chainring fixed touring bike, designed so that he can be in either small cog/large ring, or large cog/small ring I think. Looks like the dropouts are slanted.

Take a look:
http://farm2.static.flickr.com/1355/...d621f91c_b.jpg
theetruscan is offline   Reply With Quote
Old 08-14-07, 09:54 PM   #15
Alzonder
Senior Member
 
Alzonder's Avatar
 
Join Date: Jun 2005
Location: Toronto
Bikes:
Posts: 140
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Check this one:
http://www.sheldonbrown.com/asc.html
Alzonder is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 05:29 AM.