Bicycle TutorBicycle Tutor

Show off your bike!

Related video tutorials:
Slippage, so frustrating, please help!
#1
I have an MTB, it's not new but I've looked after the bike well.
Last week I broke my chain, purposefully, to clean it as it needed a clean.
Got it beautifully clean and all links were nice and flexible as they should be. Popped the chain back on and my problems began.
First of all my 8spd trigger shifter broke and I had to replace that, so I've now a new one on the bike and as far as I can tell I've got it sweetly adjusted.
I went for a ride and found that when I put pressure on certain gears (my favourite included) it slips with a loud KLANG and I almost break my leg.
I thought I may have done my chain in so I ordered a new one.
I first measured the new chain with the old, shortened it to the old chain length and then put it on the bike using the joiner that came with the chain.
Bike rides much smoother but still that annoying slippage when applying pressure to the pedals, particularly when going uphill.
Please help!
Thank you.

Reply
#2
it sounds like you might have some wear on the cassette. Take a look at the teeth on the cassette a worn tooth will start to look more like a "shark fin shape" rather than a tooth that it used to look like. This can cause chain slippage. Another cause could be chain wear as well.

Reply
#3
Looking at my rear cassette I find it's in good order, however, looking at my big chainring I can notice some shark fins in there and a couple of broken teeth too, both alongside each other.
The chain is brand new.

Reply
#4
Unfortunately it sounds like your cassette is worn, especially if it's a Shimano.
There is a fine line between good and worn and can not be judged by just looking at the teeth.
The only way to tell is by fitting a new one really.
If the chain still slips on the other chainring as well then I would think this proves it.
By the way some Shimano chainrings have low teeth in a couple of places to help shifting. Are these your "broken" ones?
Also if you have worn chainrings then these will wear out chains quicker.

[font=Trebuchet MS]Ride hard or ride home alone![/font]
Reply
#5
Problem solved. Replaced the rear cassette. Bike now runs sweet as a nut. Stunning.
Thank you for all your feedback!

Reply
#6
wow i had the same problem ...but to make sure did this happen to you when shifting or just when pedaling? For me it happens at certain parts in peddling and when i examined my bike while flipped i noticed it "slipped" where the chain was kinked... i'm looking into buying a new chain but sadly it sounds like i need to spend more money... how much aprox did the repairs cost you?

Reply
#7
swift1ne - It sounds like you might have a stiff link in the chain. Try flexing the "kinked" link side to side a little (90 degrees to the way it is supposed to bend) to free it up.

Reply
#8
Davem- i did this and even used degreaser and am now soaking my old chain in chainsaw oil i figured chainsaw chains are under way more stress , not sure if it will work but i'm looking for a new chain as well

Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Chain slippage? binrotheheretic 5 7,028 12-23-2013, 08:58 PM
Last Post: cny-man
  Chainring Slippage - link to video Dexradio 6 5,635 04-21-2013, 11:08 AM
Last Post: Dexradio
  New Chain + Cassette, Slippage when in small front and mid-to-small rear reform 7 10,695 02-26-2012, 09:31 PM
Last Post: bikeracr45
  Chain slippage Cbusbikenewb 2 5,674 04-24-2011, 06:54 AM
Last Post: Cbusbikenewb
  Back Gear slippage/problem MattS 1 5,249 08-25-2009, 01:12 PM
Last Post: Joe_W
  Slippage! glrcoach 6 4,562 08-22-2009, 01:17 PM
Last Post: Joe_W
  Freewheel slippage aitch 2 7,179 03-31-2009, 07:32 AM
Last Post: aitch

Forum Jump:



ISSN 1918-3445 © Copyright 2007-2010 Bicycle Tutor / Privacy Policy / Created by Alex Ramon

feed