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 03-26-03, 09:43 AM   #1
john_dun
Just Ride.
Thread Starter
 
john_dun's Avatar
 
Join Date: Jul 2002
Location: Glasgow
Bikes: Cannondale F600 Custom build
Posts: 54
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Cassette movement?

At work last week some ass hole banged something into the back of my bike. The rear skewer somehow mangaged to snap. Ever since their has been a strange clicking (almost like a scratching noise) coming from the rear of the bike. I took the wheel off I realised thier was a bit of side movement in the cassette. Also when I rotate the wheel it isnt nearly as smooth as it used to be (their is no play when the wheel is attached to the bike). Do you think something has come loose (wishful thinking) or do you reckon i'll need a new cassette? The cassette I have is a Shimano HG-50, 8 speed, 11-32t

Here's the full spec: http://www.specialized.com/SBCBkMode...untain&my=2003

p.s. should you grease a rear skewer before you install it?
john_dun is offline   Reply With Quote
Old 03-26-03, 01:46 PM   #2
D*Alex
Banned
 
Join Date: Aug 2001
Location: upstate New York
Bikes:
Posts: 1,688
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Umm....if your skewer snapped, then nothing is holding the wheel on-of course it's going to move......
__________________
Je vais à vélo, donc je suis!
D*Alex is offline   Reply With Quote
Old 03-26-03, 01:54 PM   #3
pat5319
Senior Member
 
pat5319's Avatar
 
Join Date: Sep 2000
Location: Spokane WA
Bikes: Seven Axiom Ti, Trek 620, Masi cylocross (steel). Masi Souleville 8spd, Fat Chance Mtn (steel), Scwinn Triple Bar cruiser, Mazi Speciale Fix/single, Scwinn Typhonn
Posts: 1,141
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It sounds like you may have a bent or even broken axle as well.

( I'm sure you replaced your skewer, as most reasonable would assume.)

Grease does keep the rust at bay and the and the adjust-knob turning easier.

If none of your cogs are bent, check the spacing, keep the cassette

Ride with Care
Pat
pat5319 is offline   Reply With Quote
Old 03-27-03, 05:03 AM   #4
NuTz4BiKeZ
Addicted to Tinkering
 
NuTz4BiKeZ's Avatar
 
Join Date: Mar 2003
Location: New Zealand
Bikes:
Posts: 191
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If the axel was bent wouldnt you see some odd movement in the casette as the wheel spins?

I found a bent axel by removing the wheel and rotating one end of the axel by hand... you could see the other end of the axel moving (up and down) as it turned.
NuTz4BiKeZ is offline   Reply With Quote
Old 03-27-03, 06:46 AM   #5
RainmanP
Mr. Cellophane
 
RainmanP's Avatar
 
Join Date: Nov 2000
Location: New Orleans, LA
Bikes:
Posts: 3,037
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm with Pat. If your skewer snapped it seems like there must have been some stress applied to the axle, since the skewer is inside the axle. A new axle is about $10. After such a trauma to the wheel I think I would replace the axle just as a precaution. If your hub uses cartridge bearings they may have been affected also since they are not designed to withstand side to side stress. I guess worst case if you have cup and cone hubs there could have been enough stress to affect the cups which are integral to the hub.

I realize some of these ideas are long shots, and let me stress that I am not a mechanical engineer so I may have misused some terms. These are just things I would check, more or less in this order.
__________________
If it ain't broke, mess with it anyway!
RainmanP is offline   Reply With Quote
Old 03-27-03, 01:51 PM   #6
john_dun
Just Ride.
Thread Starter
 
john_dun's Avatar
 
Join Date: Jul 2002
Location: Glasgow
Bikes: Cannondale F600 Custom build
Posts: 54
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Alex, OF COURSE I REPLACED THE SKEWER!

The skewer snapped at the very end (opposite the lever). The axle doesnt appear to be bent. This is the rear hub: Shimano RM-40, 32 hole, sealed cassette.

Anyone got any ideas as to whats gone wrong?
john_dun is offline   Reply With Quote
Old 03-27-03, 09:32 PM   #7
roadbuzz
Just ride.
 
roadbuzz's Avatar
 
Join Date: Oct 2000
Location: C-ville, Va
Bikes:
Posts: 3,246
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
First, bearing play that goes away when the wheel is clamped in place is expected (see Sheldon Browns web-site for explanation). The smoothness thing could just mean your bearings need to be cleaned and replaced (if it's not a sealed unit). They would have to be in very bad shape to cause that much noise, but it's an easy thing to check (again, if it's not a sealed unit).

Don't know what's wrong, you didn't give us much to go on. Sideways movement of the cassette is a problem. If that puppy won't tighten down, something is hosed.

If it will tighten down, but the noise remains, you need to do some investigation. I'd start by doing some experiments to narrow down possible causes. Do you get the clicking/scratching noise in all gears? In fact, does it continue when you coast (don't pedal)? What about when spin the wheel and you aren't on the bike at all? If something hit your bike that hard, it may have messed up something in the drivetrain, maybe even bent the frame?
roadbuzz 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 03:43 PM.