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 03-30-11, 07:52 AM   #1
nlreid44
Engineer of the Future
Thread Starter
 
nlreid44's Avatar
 
Join Date: Mar 2011
Location: South Carolina
Bikes:
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Informational

Hello, Im in the procees of an Engineering Project for my Engineering Design and Development class. I'm looking for information on bicycle derailling correctors. Does the technology already exist to where if a chain slips off track that a mechanism will put the chain back on track without the rider having to change gears or completely stop the bike? Any information is well appreciated.
nlreid44 is offline   Reply With Quote
Old 03-30-11, 08:09 AM   #2
jgedwa
surly old man
 
jgedwa's Avatar
 
Join Date: Sep 2006
Location: Carlisle, PA
Bikes: IRO Mark V, Karate Monkey half fat, Trek 620 IGH, Cannondale 26/24 MTB, Amp Research B3, and more.
Posts: 3,347
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
A couple of things out there that do something like this:

-the derailleurs themselves are their own "correctors" I suppose.
-Bashguards on the front ring keep the chain from going too far over or under.
-Paul and, I think, Rohlhoff make something like a dummy front derailleur cage that keeps the chain from slipping of the rings
-N-stop and some others make a little clamp on projection that keeps the chain from dumping off the inside of the front chain.
-and a whole bunch of various things that downhill MTBers use to keep the chain from bobbing around.
-good ol' dork disks keep the chain from overshifting into the spokes on the rear.
-on singlespeed setups I have seen a specialty cog that has a small flange on both sides of the cog that keeps the chain from wanting to go somewhere else.

Not to say that there is not room for another solution, but as it stands there are several ways to keep the chain from being where you don't want it to be.

jim
__________________
Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
--------------------------
SB forever
jgedwa is offline   Reply With Quote
Old 03-30-11, 08:13 AM   #3
SmallieBiggs
Guest
 
Bikes:
Posts: n/a
Mentioned: Post(s)
Tagged: Thread(s)
Quoted: Post(s)
On a bike with derailleurs, if they are properly set up, having the chain fal off is actually quite rare. If the chain does fall off the front chainrings, and the bike still has some forward momentum, you can often shift the chain back onto the chainring.

For bikes without derailleurs, or bikes with only rear derailleurs, there are a few devices available - rear cogs with guides built in, devices that bolt near the front chainrings to physically block the chain from faling off, and bash guards are all options.
  Reply With Quote
Old 03-30-11, 08:30 AM   #4
nlreid44
Engineer of the Future
Thread Starter
 
nlreid44's Avatar
 
Join Date: Mar 2011
Location: South Carolina
Bikes:
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yes i have seen the derailleurs and other devices such as this, but these only appear to prevent the slips, none that i have seen really correct the problem without causing further hassle
nlreid44 is offline   Reply With Quote
Old 03-30-11, 08:40 AM   #5
jsharr
You Know!? For Kids!
 
jsharr's Avatar
 
Join Date: Apr 2005
Location: Just NW of Richardson Bike Mart
Bikes: '05 Trek 1200 / '90 Trek 8000 / '? Falcon Europa
Posts: 6,157
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
There are devices to help keep the chain from gettting sucked into areas where it should not when it does come off the front chainrings. Google anti chain suck devices for more info. Most experienced riders can get the chain back on the front rings just using the shifter as previously noted. Not sure anything else is really needed, but would be interested in seeing what you come up with.
__________________
Are you a registered member? Why not? Click here to register. It's free and only takes 27 seconds! Help out the forums, abide by our community guidelines.
Quote:
Originally Posted by colorider View Post
Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
jsharr 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 06:42 PM.