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- Posts: 32
- Joined: Sat Mar 10, 2012 11:15 pm
What i would like to know is why my chain slipps off allways on my crank set it happens when i go from the bigger gear to the smaller one at thw pedals and when i pedal backwards at a stop to get my foot on top to take off from a stop
What do you guys think this could be the bike is a pinarello fp2 with 105
- Mulger bill
- Super Mod
- Posts: 28906
- Joined: Sun Sep 24, 2006 2:41 pm
- Location: Sunbury Vic
My guess is either the low limit screw on the front mech is not set properly and/or your chain may be a link or two too long.
BTW, you'll get more hits putting a mechanical thread in the Shed forum. I'll slip this one over for the resident wrench gods to ponder.
London Boy 29/12/2011
- Posts: 3022
- Joined: Sun May 31, 2009 6:28 am
- Location: Wherever the sun is shining
The front derailleur adjustment can be a bit tricky to play with particularly if the 105 shifters you have were designed to also handle a triple chain ring.
In this case it may be best to have the mechanic at your local bike shop do the adjustments as part of a service as there are bound to be other other areas of the gearing that may require tweaking.
Nice bike by the way.
- Posts: 406
- Joined: Thu Sep 30, 2010 1:11 am
- Location: WA
It's a very good idea to have the mechanics at your bike shop adjust the derailleur at the next service. That said, being able to adjust your own derailleurs is a skill worth learning.
This link will take you to the Shimano web site. If you enter "105" in the search field, it will show you a list of documents relating to the 105. Scroll down the list until you get to "FD Front Derailleurs". Find the model number of your particular derailleur.
If you're not sure if you have the right model number, open the "EV" link for that model and see if it looks like yours.
The links starting with 'SI" are the service instructions. If you open the service instructions for your particular model, it will show you how to adjust it.
There are also heaps of tutorials and videos on the net that show how to go about it. Try searching Google for "video adjusting Shimano 105 front derailleur".
2010 Oppy C6
- Posts: 67
- Joined: Sat Oct 15, 2011 3:09 am
- Location: Hobart (Howrah)
- Posts: 32
- Joined: Sat Mar 10, 2012 11:15 pm
- Posts: 1244
- Joined: Sat Dec 10, 2011 7:53 am
- Location: Brisbane
If the bike shop didn't fix the problem, take it back and explain clearly what is happening.
From what I understand you are saying, the chain often comes off the small chainring inwards onto the bottom bracket.
As said above, the most likely reason for this, is the inner limit screw is not adjusted outwards (away from the frame) adequately.
Other things that could contribute are
- chain age and amount of stretch
- chainring age and wear
- lack of lubrication on a stiff or faulty chain.
- the wrong width chain has been fitted.
A final possibility is operator error, where you are causing the chain to come off by spinning the cranks backwards very quickly, or timing your gear changes poorly. However, if the limit screw is adjusted properly, this is unlikely to happen.
Re the non 105 FD, did you buy the bike new? is it the original FD? How many k's has the bike done?
It would help if you could answer the questions above. Otherwise, take it back to your LBS, and if it continues to occur, take it to another shop, and never go back to the original one.
- Posts: 5599
- Joined: Thu Jul 10, 2008 9:08 pm
- Location: Yagoona, AU
OH DIO wrote:I got the bike second hand i would say its done about 1000 to 2000 km and yes i would say it is after reading up about the bike on the net
If it's done so little km's, the problem isn't wear related. As you don't know it's history, one possibility is that
it might have been stacked - and bent the derailleur. But eliminate the simple possibilities before you turn to
that - and really any competent LBS mechanic should have told you about that already.
It's not hard to do your own derailleur adjustments if you aren't a complete mechanical klutz. Plenty of youtube videos
out there, but a more thorough explanation can be found on the Park tools website: Front Derailleur Adjustments.
Somebody has to do something, and it's just incredibly pathetic that it has to be us -Jerry Garcia
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