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 Post subject: correct chain length
PostPosted: Wed Oct 23, 2013 9:14 pm 
Newbie

Joined: Wed Oct 23, 2013 8:54 pm
Posts: 4
I have a new chain shimano hg40 that needs fitting to my univega alpina 5.3. Does anyone know how many links are required for the correct chain length. Currently the new chain has 116 links.


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 Post subject: Re: correct chain length
PostPosted: Wed Oct 23, 2013 9:23 pm 
retrobike rider
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Joined: Fri Mar 13, 2009 7:19 pm
Posts: 3132
Location: Leeds, for ages!
Fit it, then put chain on small (granny) ring on cranks. Then, put chain on lowest(smallest) cog on the cassette.

From here look at the rear mech, in the general area of the jockey wheels. Does the chain at the lowest point touch the top jockey wheel? If there is a gap, doesn't matter how big or small , just any gap, then chain is fine as it is.
But, generally it's too long so use your hands to gather up a few links until the rear mech cage pulls forward and, therefore creates a gap between chain and top jockey wheel. From here you be able to determine how many links to take out, if necessary.

cheers.


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 Post subject: Re: correct chain length
PostPosted: Wed Oct 23, 2013 10:15 pm 
Retro Guru
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Joined: Fri Nov 16, 2012 7:08 pm
Posts: 1248
Location: I know where the stash is – the secret's safe with me. The flying squad will never find us...
Largest cog and largest chainring method:

Without running it through the rear derailleur, run the loose chain around the largest cog/sprocket and the largest chainring. Pull the ends tight together and note the closest rivet where the two ends could be joined. From that point, count/include an extra 2 or 3 links and that should give you the length to shorten to. Once all connected, the rear derailleur should operate at a 45 degree angle pointing forwards, when on the largest cog and largest chainring together. This method seems to work fine each time. See the Park Tools website for more guidance...

http://www.parktool.com/blog/repair-hel ... gth-sizing


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 Post subject: Re: correct chain length
PostPosted: Thu Oct 24, 2013 7:31 pm 
Dirt Disciple

Joined: Thu Oct 15, 2009 12:30 am
Posts: 73
Location: Ocala. Florida
I've used Marc two tone's method on my bikes and customer's bikes for 40yrs plus. I believe less tension through the derailleur is easier on the chain and freewheel/cassette!
Cheers


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 Post subject: Re: correct chain length
PostPosted: Thu Oct 24, 2013 8:05 pm 
Retro Guru
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Joined: Fri Nov 16, 2012 7:08 pm
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Location: I know where the stash is – the secret's safe with me. The flying squad will never find us...
Cool, no problem. I tried the large cog/large ring method at time when I was experiencing a lot of chain slip/odd gear shifting and it seemed to cure it after I'd tried other options.


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 Post subject: Re: correct chain length
PostPosted: Thu Oct 24, 2013 8:12 pm 
Old School Hero

Joined: Sat Feb 02, 2008 7:53 pm
Posts: 178
Location: Accrington
I've used groovy's large ring / large sprocket method a number of times & works well for me.


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 Post subject: Re: correct chain length
PostPosted: Thu Oct 24, 2013 10:41 pm 
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Location: Suffolk
The large large method works every time.


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 Post subject: Re: correct chain length
PostPosted: Fri Oct 25, 2013 4:05 pm 
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
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Location: Yorkshire, England
Large - Large till tight then add 2 links for general use. (like on the Park website)
It is the Shimano way.

Pop to their website.


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 Post subject: Re: correct chain length
PostPosted: Fri Oct 25, 2013 7:26 pm 
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Joined: Fri Nov 16, 2012 7:08 pm
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Location: I know where the stash is – the secret's safe with me. The flying squad will never find us...
The hallowed way of the holy order of Shimano...


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