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 Post subject: Length of the chain?
PostPosted: Mon May 15, 2017 6:38 am 
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Joined: Thu Jan 22, 2015 4:11 pm
Posts: 818
Hi,

Would the length of the chain (Dura Ace 11 speed or Sram 11 speed) have to be changed when switching from 52/36 with 11-28 to 50/34 with 12-25?

The chainstay is: 405mm (specialized Tarmac disc)

Is there any online tool where I can calculate that?

Tony


Last edited by TonyM on Mon May 15, 2017 6:38 am, edited 5 times in total.

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 Post subject: Re: Length of the chain?
PostPosted: Mon May 15, 2017 7:23 am 
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Joined: Fri Dec 24, 2010 9:37 pm
Posts: 1351
Location: it's raining, it must be uk
in this instance you can be sure the chain won't be too short as the largest front/rear are both lower than current

that leaves the difference between 52/11 vs. 50/12, which i don't think will trouble you

but, you will have a chain longer than you really need, shortening it can reduce the chances of slack chain hitting the chain stay on rough surface


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 Post subject: Re: Length of the chain?
Posted: Mon May 15, 2017 7:23 am 


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 Post subject: Re: Length of the chain?
PostPosted: Mon May 15, 2017 7:46 am 
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Joined: Sun Jan 08, 2017 12:44 pm
Posts: 64
It will work but might not be ideal. Specially if you have a short cage RD. With medium/long cage you woudn't have probably noticed a thing.


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 Post subject: Re: Length of the chain?
PostPosted: Mon May 15, 2017 12:31 pm 
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Joined: Wed Nov 30, 2005 1:35 am
Posts: 211
Going by this ratios you might be a few links too long.

When you are in 34/12 is there any sag in the chain and is the rear derailleur in the fully retracted position?

Sent from my SM-G935F using Tapatalk


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 Post subject: Re: Length of the chain?
PostPosted: Thu May 18, 2017 4:02 pm 
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Joined: Thu Dec 11, 2014 9:55 pm
Posts: 87
Check this out http://www.parktool.com/blog/repair-hel ... -section-4


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 Post subject: Re: Length of the chain?
PostPosted: Fri May 19, 2017 5:10 am 
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MikeD wrote:




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 Post subject: Re: Length of the chain?
PostPosted: Fri May 19, 2017 5:19 am 
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Joined: Mon Aug 29, 2016 11:19 am
Posts: 390
Chain should work but it's longer than you need. You got only a 1 tooth decrease of your slackest gear (12+34 vs 11+36) but a good 5 teeth in the biggest diameter gear (28+52 vs 25+50). One link should probably be removed. Possibly even two.

/a


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 Post subject: Re: Length of the chain?
PostPosted: Fri May 19, 2017 7:09 am 
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Joined: Wed Aug 31, 2011 2:36 am
Posts: 275
This calculator puts those two combinations at 2 inches apart:

52/36 + 11-28 = 54 inches
50/34 + 12-25 = 52 inches

http://www.machinehead-software.co.uk/b ... hcalc.html

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 Post subject: Re: Length of the chain?
PostPosted: Sat May 20, 2017 8:25 pm 
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Joined: Thu Mar 31, 2016 10:32 am
Posts: 296
Setting chain length by small-small instead of big-big usually gives you the most cassette compatibility if you're the type to swap out cassettes.

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 Post subject: Re: Length of the chain?
PostPosted: Sat May 20, 2017 9:24 pm 
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Joined: Mon Oct 15, 2007 9:28 pm
Posts: 1359
This^^^^

2lo8 wrote:
Setting chain length by small-small instead of big-big usually gives you the most cassette compatibility if you're the type to swap out cassettes.


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 Post subject: Re: Length of the chain?
Posted: Sat May 20, 2017 9:24 pm 


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