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 07-16-09, 07:40 PM   #1
Some Guy
is ambigously awesome.
Thread Starter
 
Join Date: Jul 2009
Location: Panama City, FL
Bikes: Trek FX 7.2, 80's Schwinn Worldsport
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Schwinn Worldsport SS conversion! Hmm :S

Hey all, just came across this pretty sweet forum! I recently got my hands on a 90's Schwinn Worldsport and I plan on converting it to single speed. The problem is, I'm not really sure I know how...I've spent a perty long time researching how to but there's so many different bikes out there, it's hard to get a specific DIY...

If anyone can pitch in some tips, that would be pretty cool...I would like to do this on the cheap but I'll keep my options open!

My parents split up and they my Diddy took all of the tools, so if you guys can gimmie a list of what to get that would be tite dood. Thanks!
Some Guy is offline   Reply With Quote
Old 07-16-09, 08:57 PM   #2
ianjk
:)
 
Join Date: Nov 2006
Location: duluth
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: 3,392
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Unscrew multi-speed freewheel, screw on bmx freewheel, put on new chain, ride. Your local bike shop should be able to do the labor for pretty cheap if you don't want to spring for the tools.
ianjk is offline   Reply With Quote
Old 07-16-09, 10:28 PM   #3
Some Guy
is ambigously awesome.
Thread Starter
 
Join Date: Jul 2009
Location: Panama City, FL
Bikes: Trek FX 7.2, 80's Schwinn Worldsport
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
thanks for the reply, know of any worthy bmx freewheels?
Some Guy is offline   Reply With Quote
Old 07-17-09, 08:09 PM   #4
hairnet
Fresh Garbage
 
hairnet's Avatar
 
Join Date: Apr 2009
Location: Los Angeles
Bikes:
Posts: 12,551
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 82 Post(s)
Quote:
Originally Posted by ianjk View Post
Unscrew multi-speed freewheel, screw on bmx freewheel, put on new chain, ride. Your local bike shop should be able to do the labor for pretty cheap if you don't want to spring for the tools.
how about also redishing the wheel?
hairnet is offline   Reply With Quote
Old 07-17-09, 08:13 PM   #5
ianjk
:)
 
Join Date: Nov 2006
Location: duluth
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: 3,392
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by hairnet View Post
how about also redishing the wheel?
oh, yeah. and move spacers so hub sits evenly in dropouts... forgot about that... been such a long time.
ianjk is offline   Reply With Quote
Old 07-17-09, 10:18 PM   #6
Andy_K 
Senior Member
 
Andy_K's Avatar
 
Join Date: Jan 2008
Location: Beaverton, OR
Bikes: 2013 Kona Jake, 2015 Kona Jake the Snake, 2008 Kona Major Jake, 2013 Kona Jake the Snake, 2006 Kona Kula, 2012 Ridley Excalibur, 2001 LeMond Buenos Aires, 1984 Pinarello Gran Turismo, 1982 Trek 614, 1978 Austro-Daimler, 1987 Pinarello Montello
Posts: 9,163
Mentioned: 23 Post(s)
Tagged: 0 Thread(s)
Quoted: 297 Post(s)
If you haven't done so already, bookmark this: http://sheldonbrown.com/fixed-conversion.html
Andy_K is offline   Reply With Quote
Old 07-18-09, 07:38 AM   #7
garage sale GT
Banned
 
Join Date: May 2009
Bikes:
Posts: 2,078
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have an 85 world sport. I don't know if yours had a freewheel or a cassette. Does anyone know?

You could take it to a bike shop and have them pull off the freewheel or cassette. That would be cheaper than buying the tool.

You have to find out what system it is before you buy anything though.

Last edited by garage sale GT; 07-18-09 at 07:47 AM.
garage sale GT is offline   Reply With Quote
Old 07-18-09, 12:00 PM   #8
Some Guy
is ambigously awesome.
Thread Starter
 
Join Date: Jul 2009
Location: Panama City, FL
Bikes: Trek FX 7.2, 80's Schwinn Worldsport
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'll probably take mine in to a bike shop and see what they recommend. I think mine has a cassette.
I've read Sheldon Brown's site but the info seems a little too scattered for me to lock on.

Maybe I'm making it too complicated as it's a simple task, who knows! I just want to get it done right the first time and not have anything to worry about. My main goal is to convert it to a single speed without a chain tensioner.

Mine's a 90's model if that helps any.
Some Guy is offline   Reply With Quote
Old 07-18-09, 12:08 PM   #9
wroomwroomoops
Sir Fallalot
 
wroomwroomoops's Avatar
 
Join Date: Jul 2006
Location: Helsinki, Finland
Bikes:
Posts: 5,276
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by Some Guy View Post
I'll probably take mine in to a bike shop and see what they recommend. I think mine has a cassette.
I've read Sheldon Brown's site but the info seems a little too scattered for me to lock on.

Maybe I'm making it too complicated as it's a simple task, who knows! I just want to get it done right the first time and not have anything to worry about. My main goal is to convert it to a single speed without a chain tensioner.

Mine's a 90's model if that helps any.
If your rear wheel has a cassette, that's even better. It means you don't need one of those BMX freewheels or such. You need only a set of spacers and a BMX cog with splines that match your freehub. This solution is far superior to having a thread-on BMX freewheel because:
1. You only have to replace the cog, not the entire freewheel, once the teeth are worn out.
2. Depending on the freewheel, removing one from the rear hub can be messy. You need a special tool, but I have ran across a few freewheels for which there is no appropriate removing tool, so one has to disassemble the freewheel in order to remove it. No such problem with cogs that just slide onto the freehub.
In addition to all that, freehubs are generally better protected against penetration of water and dust, than freewheels.
wroomwroomoops is offline   Reply With Quote
Old 07-18-09, 12:48 PM   #10
hairnet
Fresh Garbage
 
hairnet's Avatar
 
Join Date: Apr 2009
Location: Los Angeles
Bikes:
Posts: 12,551
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 82 Post(s)
Quote:
Originally Posted by Some Guy View Post
My main goal is to convert it to a single speed without a chain tensioner.

Mine's a 90's model if that helps any.
well if you have vertical dropouts then you may need the tensioner.
hairnet is offline   Reply With Quote
Old 07-18-09, 01:18 PM   #11
garage sale GT
Banned
 
Join Date: May 2009
Bikes:
Posts: 2,078
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Performancebike.com and others sell kits with a few different size cogs, spacers, lockring, and chain tensioner. You don't need to worry about chainline with these kits because you stack some spacers onto the freehub, then the sprocket, then more spacers, then the lockring, so that the sprocket lines up with the chain.

You can't respace those wheels because the freehub is part of the hub and will remain on the hub, unlike taking off a 5-7 speed freewheel which causes the hub to get narrower and require less dish on the left side, so don't worry about that.

If you have vertical dropouts, you may need the chain tensioner unless you can find a magic sprocket and chainring ratio which gives you good chain tension with the hub where it is. I think people who find a magic ratio probabaly calculate the chain length given the size of the front and rear sprockets and the location of the rear hub, because just trying a bunch of sprockets and chainrings would get real expensive. There are also half chain links which can shorten the chain by a half inch instead of a full inch, which is what taking out two complete links of the chain does.

The only tools you'd need would be a lockring tool to take the cassette off and install the kit, an allen wrench to install the tensioner, a chain breaker, and either a chain whip or a vise and old piece of chain to hold the cassette steady while you remove the lockring.
garage sale GT is offline   Reply With Quote
Old 07-18-09, 06:00 PM   #12
Some Guy
is ambigously awesome.
Thread Starter
 
Join Date: Jul 2009
Location: Panama City, FL
Bikes: Trek FX 7.2, 80's Schwinn Worldsport
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks a lot for the help guys. I'll try and get a hold of some tools and I'll definitely check out the site. Here's some photos I took just to give you guys an idea of what I'm working with.
Btw, my Schwinn has a freehub so I assume it includes a cassette. If so, then it sounds like this project will be a lot easier than I thought...Just find the tools, take off all the crud and space out my gears correctly 52t-19t and trim my chain. It has a horizontal drop out so I just clip the chain accordingly and fit it in there snugly without the use of a tensioner?

http://yfrog.com/elimg7125j

http://yfrog.com/bfimg7122ej

A little off topic but,

Anyone got any tips on getting rid of oxidation? And what about paint? I don't mind using spray paint as an alternative as long as I can find some decent/reliable stuff. I'll probably do a White/Black/Blue combination or a Gray/Black/Blue combo and call it "Gray Goose".
I am still deciding whether I'll saw down the handlebars or keep it as is for the moment. I kind of dig it...

Last edited by Some Guy; 07-18-09 at 06:06 PM.
Some Guy is offline   Reply With Quote
Old 07-21-09, 08:08 AM   #13
wroomwroomoops
Sir Fallalot
 
wroomwroomoops's Avatar
 
Join Date: Jul 2006
Location: Helsinki, Finland
Bikes:
Posts: 5,276
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by Some Guy View Post
Thanks a lot for the help guys. I'll try and get a hold of some tools and I'll definitely check out the site. Here's some photos I took just to give you guys an idea of what I'm working with.
Btw, my Schwinn has a freehub so I assume it includes a cassette. If so, then it sounds like this project will be a lot easier than I thought...Just find the tools, take off all the crud and space out my gears correctly 52t-19t and trim my chain. It has a horizontal drop out so I just clip the chain accordingly and fit it in there snugly without the use of a tensioner?

http://yfrog.com/elimg7125j

http://yfrog.com/bfimg7122ej

A little off topic but,

Anyone got any tips on getting rid of oxidation? And what about paint? I don't mind using spray paint as an alternative as long as I can find some decent/reliable stuff. I'll probably do a White/Black/Blue combination or a Gray/Black/Blue combo and call it "Gray Goose".
I am still deciding whether I'll saw down the handlebars or keep it as is for the moment. I kind of dig it...

Hey, those aren't really vertical dropouts! They are semi-vertical, or even short horizontal ones! I would need a closeup of either dropout to be 100% sure, but it seems very much as if they are short horizontal dropouts, which means that you, most probably, don't need a chain tensioner, which is great! You can tension the chain by simply pulling the wheel backwards in the dropouts. That's a much neater, sturdier solution.

Read more about dropouts and conversions at Sheldon Brown's excellent website about the topic.

As for prevention of oxidation: there are two aspects to this problem. Frames oxidize both internally as well as externally. The internal oxidation can be prevented using a so-called frame-saver substance, which your LBS will apply at cost of about US$50. Don't kill me if it's more, this is just the ballpark I'm aware of.

External oxidation is, of course, prevented by a good paintjob, but a very good preemptive solution is to use spray-paints with zinc. They are some shade of gray and they act as a primer, as far as I know. The problem is, if you want to do a decent job you will have to remove the existing paint and all traces of rust, and the best way to do this is by sandblasting. Etc.....
wroomwroomoops is offline   Reply With Quote
Old 07-21-09, 10:32 AM   #14
Some Guy
is ambigously awesome.
Thread Starter
 
Join Date: Jul 2009
Location: Panama City, FL
Bikes: Trek FX 7.2, 80's Schwinn Worldsport
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks a lot for the info! By the looks of all my reading and going over the catalog specs and physically looking at my bike's guts, I managed to get an idea of what I need to do.

My Schwinn does have a Shimano freehub with a hyperglide cassette and semi horizontal dropouts.

I'll probably need to replace the chain (it's fugly) and replace the cog with a bmx cog.
Now I gotta get my hands on some tools...
Some Guy 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 11:26 AM.