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


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-21-11, 11:38 AM   #1
Scheherezade 
12mph+ commuter
Thread Starter
 
Join Date: Aug 2008
Location: Oak Park, IL
Bikes:
Posts: 863
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
24t internal gear sprocket?

Does anyone know where I can find a 24t 1/8" sprocket for a sturmey archer hub? I'm looking to buy this bike for winter riding, but I'm trying to make the gearing more spin friendly.

This is the only thing I could find so far: http://www.bonthronebikes.co.uk/428-472250
Scheherezade is offline   Reply With Quote
Old 08-21-11, 11:44 AM   #2
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 19,714
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 462 Post(s)
From SA, they stop at 22t, so you change the chainring in front, instead, buy a smaller one
to get the External ratio between the 2 where you want it.

I like the stainless steel ones from Surly , a QBP brand, a 130 crank starts at 38t
fietsbob is offline   Reply With Quote
Old 08-21-11, 11:52 AM   #3
garage sale GT
Banned
 
Join Date: May 2009
Bikes:
Posts: 2,078
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Sturmey always used to say to not go below a 2:1 ratio on their hubs because it would put too much torque on those things.
garage sale GT is offline   Reply With Quote
Old 08-21-11, 12:46 PM   #4
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 19,714
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 462 Post(s)
AW3 with a 2:1 chain drive .. in a 700c wheel, nominal 27" is 54",
so low is 40.5, high is 71.82 .. that ought to work
38:19. 40:20, 42:21
fietsbob is offline   Reply With Quote
Old 08-21-11, 12:47 PM   #5
LarDasse74
Guest
 
Join Date: Jul 2008
Location: Grid Reference, SK
Bikes: I never learned to ride a bike. It is my deepest shame.
Posts: 3,769
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You can use a 3/32 shimano cassette cog and file off all but three equally spaced inner splines... and round those ones off to fit in the cog carrier of the hub.

The Sram one linked should also work.

You also have to be wary of chainline - if you get an offset cog like the SRAM one and you used to have a flat cog, you will likely have problems. Same goes if you now have an offset cog and switch to a flat one.
LarDasse74 is offline   Reply With Quote
Old 08-21-11, 12:56 PM   #6
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 19,714
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 462 Post(s)
Different Hub,
S3X will take a screw on freewheel as is , by design.
then you can have the chain drive
as the High Ratio, , the other 2 are .75, .63
fietsbob is offline   Reply With Quote
Old 08-21-11, 12:56 PM   #7
Scheherezade 
12mph+ commuter
Thread Starter
 
Join Date: Aug 2008
Location: Oak Park, IL
Bikes:
Posts: 863
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I initially wanted to go 48x24 so I could keep the original chainring, but I could also go 44x22 by replacing everything (chainring, sprocket, chain). It's just a shame to replace all that when it's otherwise perfectly good.
Scheherezade is offline   Reply With Quote
Old 08-21-11, 01:06 PM   #8
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 19,714
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 462 Post(s)
Changing just the Chainring is easy.. If that is confusing,
putting the BD bike together by yourself, might well be worse .

Perhaps a Bike put together by the folks at a Bike Shop will be better..
the single speed thing is fashionable these days , lots of brands have one..
fietsbob is offline   Reply With Quote
Old 08-21-11, 02:31 PM   #9
krome
Senior Member
 
Join Date: Jul 2006
Bikes:
Posts: 425
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Arrgh! Why does Bikes Direct call this a track bike? It has water bottle braze ons, brakes, and a 5 speed IGH. What on earth is "track" about that?

I was going to suggest a smaller chainring, but a 130bcd won't hold one small enough.

So it is either replace the chainring and crank, or get a new chainring and cog.
krome is offline   Reply With Quote
Old 08-21-11, 05:21 PM   #10
LarDasse74
Guest
 
Join Date: Jul 2008
Location: Grid Reference, SK
Bikes: I never learned to ride a bike. It is my deepest shame.
Posts: 3,769
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by krome View Post
Arrgh! Why does Bikes Direct call this a track bike? It has water bottle braze ons, brakes, and a 5 speed IGH. What on earth is "track" about that?

I was going to suggest a smaller chainring, but a 130bcd won't hold one small enough.

So it is either replace the chainring and crank, or get a new chainring and cog.
130BCD will usually fit a chainring down to 38, which would require a 19 tooth chainring to get 2:1
LarDasse74 is offline   Reply With Quote
Old 08-22-11, 10:43 AM   #11
Scheherezade 
12mph+ commuter
Thread Starter
 
Join Date: Aug 2008
Location: Oak Park, IL
Bikes:
Posts: 863
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by fietsbob View Post
Changing just the Chainring is easy.. If that is confusing,
putting the BD bike together by yourself, might well be worse .

Perhaps a Bike put together by the folks at a Bike Shop will be better..
the single speed thing is fashionable these days , lots of brands have one..
The maintenance isn't any issue. I just don't like wasting parts.

I think I'll go 44x22 for drivetrain life.

Thanks folks.
Scheherezade 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 12:04 PM.