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 04-05-14, 09:06 PM   #1
LeanMachine
Member
Thread Starter
 
LeanMachine's Avatar
 
Join Date: Mar 2014
Bikes:
Posts: 42
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Why did my bike munch my RD?

I was about to go down a pretty extensive decline when my chain bounced partially off the big ring. Instead of stopping infront of traffic I coasted down the hill and stopped to readjust. I retracted the chain onto the ring again, mounted, pushed out and got about 10-15 feet when my bike skidded to a stop


I looked down and my previously straight derailleur was twisted and one of the cogs was broken.

I'd like to know what I did wrong. My bike lacks the mechanism (front derailleur?) to shift rings, so I do it manually.

I miss commuting on my huffy and I am sad, I am going to bring it to my LBS, since I need a new RD and it can't be straightened with the tools I have.



Here is a pic, it is basically twisted 90 degrees into the spokes
Attached Images
File Type: jpg 20140405_215210 (1).jpg (90.9 KB, 115 views)
LeanMachine is offline   Reply With Quote
Old 04-05-14, 09:16 PM   #2
Dave Cutter
Senior Member
 
Dave Cutter's Avatar
 
Join Date: Oct 2013
Location: D'uh... I am a Cutter
Bikes: '14 Trek 1.1, '10 Fuji Finest 3.0, '98 Cannondale R500, '88 Trek 360
Posts: 5,144
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 162 Post(s)
I'd guess that your chain bounced partially off the big ring and the derailleur. You repositioned the chain back on the big ring but missed what was going on with the rear derailleur. It is impossible for me to guess it the rear derailleur was damaged before or after you stopped.

It might be a good idea to find a similar donor bicycle... to take parts from. Maybe a cheap unusable bicycle with front-end damage.

Last edited by Dave Cutter; 04-05-14 at 09:20 PM.
Dave Cutter is offline   Reply With Quote
Old 04-06-14, 10:44 AM   #3
LeanMachine
Member
Thread Starter
 
LeanMachine's Avatar
 
Join Date: Mar 2014
Bikes:
Posts: 42
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I will look into that, thanks. I have a new bike on its way so this one might just be donated to a worthy cause
LeanMachine is offline   Reply With Quote
Old 04-06-14, 11:07 AM   #4
jyl
Senior Member
 
jyl's Avatar
 
Join Date: Aug 2006
Location: Portland OR
Bikes: 61 Bianchi Specialissima 71 Peugeot G50 7? P'geot PX10 74 Raleigh GranSport 75 P'geot UO8 78? Raleigh Team Pro 82 P'geot PSV 86 P'geot PX 91 Bridgestone MB0 92 B'stone XO1 97 Rans VRex 92 Cannondale R1000 94 B'stone MB5 97 Vitus 997
Posts: 6,954
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
If the chain was twisted or dislodged from the rear derailleur jockey wheels, when you resumed pedaling it could have gotten jammed in the jockeys. When you continued pedaling, you damaged the derailleur, possibly by pulling it into the spokes, which could have locked the real wheel. I'm not clear what kind of bike it is - I think of "Huffy" as a low end bike, but anyway it may not be worth repairing.
jyl is offline   Reply With Quote
Old 04-06-14, 12:54 PM   #5
LeanMachine
Member
Thread Starter
 
LeanMachine's Avatar
 
Join Date: Mar 2014
Bikes:
Posts: 42
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It is an old huffy, the RD is a XUNDAH which from my research is a cheap Chinese RD made for mountain bikes. There has been a bike I have been eyeing all year that is basically abandoned that I might have to piece apart.
LeanMachine is offline   Reply With Quote
Old 04-06-14, 04:32 PM   #6
cny-bikeman
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Bikes: 2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
Posts: 6,321
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 54 Post(s)
Anytime you have an accident or incident with your bike it's important to run through the range in front and back, spin the wheels and check the brakes before hopping back on the bike. As you have found out not doing so can cause very big problems very quickly.
cny-bikeman is offline   Reply With Quote
Old 04-06-14, 06:12 PM   #7
LeanMachine
Member
Thread Starter
 
LeanMachine's Avatar
 
Join Date: Mar 2014
Bikes:
Posts: 42
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I will keep that in mind. I was timing myself and I likely used a fair bit of power to start in the highest gear. Wasn't thinking but will do so in the future.
LeanMachine is offline   Reply With Quote
Old 04-06-14, 11:42 PM   #8
gsa103
Senior Member
 
Join Date: May 2013
Location: SF Bay Area
Bikes: Bianchi Infinito (Celeste, of course)
Posts: 3,006
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 146 Post(s)
Also, as you just discovered. The front derailuer serves as a chain guide. Most cranksets have shifting ramps and pins, which will throw the chain without a derailuer or other chain keeper.
gsa103 is offline   Reply With Quote
Old 04-07-14, 08:33 AM   #9
wheelreason
Senior Member
 
Join Date: Aug 2009
Bikes:
Posts: 485
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Happens Until Finally Find Yourself (a real bike).
Seriously though, most likely the chain came of the r dlr pulley, and when you resumed the hour record attempt, it predictably did what it did. As others have mentioned, when you have a mishap or crash (and before starting a ride) Its a good idea to spin the wheels, and turn the cranks, takes 10 seconds, and can save a lot of grief.
wheelreason is offline   Reply With Quote
Old 04-07-14, 12:47 PM   #10
LeanMachine
Member
Thread Starter
 
LeanMachine's Avatar
 
Join Date: Mar 2014
Bikes:
Posts: 42
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by wheelreason View Post
Happens Until Finally Find Yourself (a real bike).
Seriously though, most likely the chain came of the r dlr pulley, and when you resumed the hour record attempt, it predictably did what it did. As others have mentioned, when you have a mishap or crash (and before starting a ride) Its a good idea to spin the wheels, and turn the cranks, takes 10 seconds, and can save a lot of grief.

You know me too well, I managed to get the RD off, it was super twisted and I had to cut the cable, hindsight makes me feel this was a bad decision. I might just take a few links of the chain and make it a fixie, this won't happen for a while. I am hoping if I sell it with the buzzwords "vintage" and "fixie" I can attract a susceptible hipster.


My new bike comes Wednesday, so I hope all my previous mistake allow me to make less with my new one.
LeanMachine is offline   Reply With Quote
Old 04-07-14, 12:53 PM   #11
cny-bikeman
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Bikes: 2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
Posts: 6,321
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 54 Post(s)
Quote:
Originally Posted by LeanMachine View Post
I will keep that in mind. I was timing myself and I likely used a fair bit of power to start in the highest gear. Wasn't thinking but will do so in the future.
That's a whole 'nother topic, but starting in the highest gear will just slow you down. In fact in most instances riding in the highest gear on the level will slow you down.
cny-bikeman is offline   Reply With Quote
Old 04-07-14, 01:04 PM   #12
Dave Cutter
Senior Member
 
Dave Cutter's Avatar
 
Join Date: Oct 2013
Location: D'uh... I am a Cutter
Bikes: '14 Trek 1.1, '10 Fuji Finest 3.0, '98 Cannondale R500, '88 Trek 360
Posts: 5,144
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 162 Post(s)
Quote:
Originally Posted by LeanMachine View Post
..... I might just take a few links of the chain and make it a fixie....... I am hoping if I sell it with the buzzwords "vintage" and "fixie" I can attract a susceptible hipster.
I can see it now listed on Craigslist: Classic vintage fixie. Like new tires still have nubs. Might benefit from tune up.

[Be sure to include a blurry picture taken in near darkness... it should be impossible to determine even the color of the bicycle... let alone the model.]
Dave Cutter is offline   Reply With Quote
Old 04-07-14, 01:06 PM   #13
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 20,416
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 655 Post(s)
Quote:
on my huffy
thats part of it, .. and the other is bending, past damage done but ignored ..


if you :"sell it" either ask steel scrap price , by the pound or actually, offer them gas money to take it away ..
fietsbob is offline   Reply With Quote
Old 04-07-14, 01:50 PM   #14
LeanMachine
Member
Thread Starter
 
LeanMachine's Avatar
 
Join Date: Mar 2014
Bikes:
Posts: 42
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Dave Cutter View Post
I can see it now listed on Craigslist: Classic vintage fixie. Like new tires still have nubs. Might benefit from tune up.

[Be sure to include a blurry picture taken in near darkness... it should be impossible to determine even the color of the bicycle... let alone the model.]

I might add "rare" as well. Or I could leave the cassette on and call it a "rare convertible fixie" with a back story of its fictional creation

Also I weighed the bike this morning it was 38lbs, not sure how much of that is rust thought

Last edited by LeanMachine; 04-07-14 at 02:24 PM.
LeanMachine is offline   Reply With Quote
Old 04-07-14, 02:11 PM   #15
Dave Cutter
Senior Member
 
Dave Cutter's Avatar
 
Join Date: Oct 2013
Location: D'uh... I am a Cutter
Bikes: '14 Trek 1.1, '10 Fuji Finest 3.0, '98 Cannondale R500, '88 Trek 360
Posts: 5,144
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 162 Post(s)
Quote:
Originally Posted by LeanMachine View Post
I might add "rare" as well....... I weight the bike this morning 38lbs
Solid Classic vintage fixie. Not made like this old steel beauty anymore. Like new tires still have nubs. Might benefit from tune up.

Now... I feel ashamed.
Dave Cutter is offline   Reply With Quote
Old 04-07-14, 02:26 PM   #16
LeanMachine
Member
Thread Starter
 
LeanMachine's Avatar
 
Join Date: Mar 2014
Bikes:
Posts: 42
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Maybe I should just post it in the free section. But I also want to see who will bite on it.
LeanMachine 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 10:01 PM.