Retrobike Forum Index

It is currently Tue Dec 06, 2016 1:42 pm

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 20 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: Front Mech Prob
PostPosted: Mon Apr 08, 2013 9:00 am 
Old School Grand Master
User avatar

Joined: Sat Oct 06, 2012 5:17 pm
Posts: 3775
Location: Norn Iron
Morning all,

I was out yesterday (don't be too surprised) on my new bike - so this is not a retro problem. When changing down the chain gets stuck on the top of the small chainring. I had this problem before and i thought the chain was falling between the rings but yesterday i stopped and had a good look at it. The chain is actually nicely positioned with the rollers on top of the small chainring teeth. I have not seen this before and i did not get any pics.

Any ideas to resolve this? The cranks are compact FSA, mechs are Tiagra and everything is almost new (100 miles or less).

Thanks all, have a good week,

Richard


Top
 Profile  
 
 Post subject: Re: Front Mech Prob
PostPosted: Mon Apr 08, 2013 3:37 pm 
rBoTM Winner
rBoTM Winner
User avatar

Joined: Fri Nov 16, 2012 2:38 pm
Posts: 302
Location: West Dorset
Hi Richard, I had a similar problem (albeit on my not new Raleigh 531) when I fitted a new chain. I wonder whether the chain needs a few miles to bed in and make sure there is plenty of lubricant. When shifting from big ring to small the chain would sit on top of the small ring and skate along until I stopped pedalling where upon it would then sit down where it should.

Keep oiling and shifting and I suspect it will go away on its own.

Martin


Top
 Profile  
 
 Post subject: Re: Front Mech Prob
PostPosted: Mon Apr 08, 2013 6:59 pm 
Old School Grand Master
User avatar

Joined: Sat Oct 06, 2012 5:17 pm
Posts: 3775
Location: Norn Iron
Martin,

I actually did that last night and rode around changing up and down - it happens maybe one time in five but - as with these things - that is the time you need to be pedalling!!! Mine will not drop down when i stop pedalling i need to go back into high and drop to low again - and, honestly, that gets dangerous as by that time i am almost stopped.

Thanks,

Richard


Top
 Profile  
 
 Post subject: Re: Front Mech Prob
PostPosted: Mon Apr 08, 2013 7:21 pm 
rBoTM Winner
rBoTM Winner
User avatar

Joined: Tue Mar 27, 2012 9:28 pm
Posts: 3104
Location: Mansfield Woodhouse, Nott's.
So is this on the Forme Richard ?


Top
 Profile  
 
 Post subject: Re: Front Mech Prob
PostPosted: Mon Apr 08, 2013 7:22 pm 
Old School Grand Master
User avatar

Joined: Sat Oct 06, 2012 5:17 pm
Posts: 3775
Location: Norn Iron
'Tis!!!

Non-retro unfortunately.

Richard


Top
 Profile  
 
 Post subject: Re: Front Mech Prob
PostPosted: Mon Apr 08, 2013 7:23 pm 
rBoTM Winner
rBoTM Winner
User avatar

Joined: Tue Mar 27, 2012 9:28 pm
Posts: 3104
Location: Mansfield Woodhouse, Nott's.
This was happening to me on my modern Wilier and I ditched the Campag' chain for a KMC chain and it cured it.


Top
 Profile  
 
 Post subject: Re: Front Mech Prob
PostPosted: Mon Apr 08, 2013 7:28 pm 
Old School Grand Master
User avatar

Joined: Sat Oct 06, 2012 5:17 pm
Posts: 3775
Location: Norn Iron
OOOOhhhhhhhh - a chain problem - that would sorta agree with Penfold. I had wondered if it was the way the rings were set up and the chain was dropping to the wrong bit of the small ring.

Would a lot of oil help? I lubricated with the precision oil and i did consider 3 in 1. I might check and see if i have a spare chain.

Thanks again Ian,

Richard


Top
 Profile  
 
 Post subject: Re: Front Mech Prob
PostPosted: Mon Apr 08, 2013 7:34 pm 
rBoTM Winner
rBoTM Winner
User avatar

Joined: Tue Mar 27, 2012 9:28 pm
Posts: 3104
Location: Mansfield Woodhouse, Nott's.
On my Wilier, Richard, it was a nightmare as when I came off the big-ring and when the chain
was on the inner-ring, it would be at a slight angle touching the inner part of the big-ring and
my cranks would spin crazily over the teeth and would not drop onto the rings teeth.


Top
 Profile  
 
 Post subject: Re: Front Mech Prob
PostPosted: Mon Apr 08, 2013 7:51 pm 
rBoTM Winner
rBoTM Winner
User avatar

Joined: Fri Nov 16, 2012 2:38 pm
Posts: 302
Location: West Dorset
Before ditching the chain you might try backing off the small ring set screw on the FD so when you shift from big ring to small ring it gives the chain slightly more of a shove on the down shift. Worth a try, it's free after all!

M


Top
 Profile  
 
 Post subject: Re: Front Mech Prob
PostPosted: Mon Apr 08, 2013 7:56 pm 
rBoTM Winner
rBoTM Winner
User avatar

Joined: Tue Mar 27, 2012 9:28 pm
Posts: 3104
Location: Mansfield Woodhouse, Nott's.
That also sounds a good idea too Martin.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 20 posts ]  Go to page 1, 2  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: Apple Tree, Spokesmann and 30 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group