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PostPosted: Mon Apr 24, 2017 12:09 pm 
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Joined: Fri Jan 27, 2017 12:46 am
Posts: 6
Hi there,

Running a Dura Ace setup with 52/36T and 11-28T cassette.

I'm looking at the new 11-30T which is compatible with my setup . Wondering if I need to lengthen my chain to support the extra teeth?

Thanks, Fred


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Posted: Mon Apr 24, 2017 12:09 pm 


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PostPosted: Mon Apr 24, 2017 12:54 pm 
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Joined: Sat Feb 07, 2009 5:52 am
Posts: 564
unless your current chain/cassette is at the limit, no, you won't need to change the length.


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PostPosted: Mon Apr 24, 2017 6:00 pm 
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Joined: Fri Sep 25, 2015 5:13 pm
Posts: 245
Would swapping wheels with 28T and 30T (or even 32T) cassette affect the chain length?


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PostPosted: Mon Apr 24, 2017 9:16 pm 
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Posts: 642
No, the chain will still be the same length. :lol:

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PostPosted: Mon Apr 24, 2017 10:10 pm 
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Joined: Sat May 21, 2016 12:59 pm
Posts: 340
for chainstay=410,420,430 it's the same recommended chainlength, for chainstay=425 chainstretch=0.14 of link for 30T over 28T - it's ok,
for chainstay=415 chainstretch=0.36 for 30T over 28T chainlength, it will work, but it is better to add extra link (even if you plan to swap 30T/28T)

chainstay length=410mm 52x11-28T chain length unrounded=53.51 recomended=54 links
chainstay length=410mm 52x11-30T chain length unrounded=53.97 recomended=54 links

chainstay length=415mm 52x11-28T chain length unrounded=53.89 recomended=54 links
chainstay length=415mm 52x11-30T chain length unrounded=54.36 recomended=55 links

chainstay length=420mm 52x11-28T chain length unrounded=54.29 recomended=55 links
chainstay length=420mm 52x11-30T chain length unrounded=54.76 recomended=55 links

chainstay length=425mm 52x11-28T chain length unrounded=54.68 recomended=55 links
chainstay length=425mm 52x11-30T chain length unrounded=55.14 recomended=56 links

chainstay length=430mm 52x11-28T chain length unrounded=55.07 recomended=56 links
chainstay length=430mm 52x11-30T chain length unrounded=55.54 recomended=56 links

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PostPosted: Tue Apr 25, 2017 11:04 pm 
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Joined: Fri Jan 27, 2017 12:46 am
Posts: 6
This is excellent information, thank you everyone..!


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PostPosted: Wed Apr 26, 2017 12:30 pm 
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Joined: Wed Jan 22, 2014 11:48 am
Posts: 2440
Location: Vienna Austria
If the chain is at the limit for 52/28 then shifting 52/30 will rip off your derailleur/hanger/dropout, simple as that.

Unthread the chain from the rear derailleur and put it over the 52 and the 30. If you can do this without tension, you can carefully try it with the derailleur and see how stretched out the arm is.

My bet would be that the chain is long enough, but the price for when it isn't is too high to not check.


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PostPosted: Wed Apr 26, 2017 2:09 pm 
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Posts: 817
Yes very simple just to try it.
Also look how old your current chain is maybe better buy a new chain anyway?


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PostPosted: Wed Apr 26, 2017 3:00 pm 
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Joined: Tue May 23, 2006 9:39 pm
Posts: 1055
also, seems that 11 spd has tighter tolerances according to Park Tools. they are now making a chain check tool that is .5/.75 instead of .75/1.0.

i run mine at 53 links...with the KMC missing link =54 total. that's for a 52/28.
i read somewhere here that someone put a 30 on the short cage and it works fine...just adjust the B limit screw.

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PostPosted: Mon May 15, 2017 3:27 am 
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Joined: Fri Jan 27, 2017 12:46 am
Posts: 6
Just letting you know that I purchased and installed the 11-30T Cassette with my 52/36 chainring combo and it fit and works perfectly. As it's Di2, I updated the config in the Shimano e-Tube software and all is fine even with Synchro Shifting. There was no rear derailleur adjustment necessary.

Thanks for the advice and thoughts.


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PostPosted: Mon May 15, 2017 4:21 pm 
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Location: NorthEU
Haha, well come again when you mounted a 11-36T (Sram 1170)

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PostPosted: Mon May 15, 2017 6:37 pm 
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Joined: Sun Mar 02, 2014 6:36 pm
Posts: 377
Location: NY USA
Here's my sad tale, when I put on a 32.
DIY Carbon fiber repair - seatstay.

I see you have things sorted... I only put this here as a caution to others.

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PostPosted: Tue May 16, 2017 6:19 am 
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Posts: 850
ooo wrote:
for chainstay=410,420,430 it's the same recommended chainlength, for chainstay=425 chainstretch=0.14 of link for 30T over 28T - it's ok,
for chainstay=415 chainstretch=0.36 for 30T over 28T chainlength, it will work, but it is better to add extra link (even if you plan to swap 30T/28T)

chainstay length=410mm 52x11-28T chain length unrounded=53.51 recomended=54 links
chainstay length=410mm 52x11-30T chain length unrounded=53.97 recomended=54 links

chainstay length=415mm 52x11-28T chain length unrounded=53.89 recomended=54 links
chainstay length=415mm 52x11-30T chain length unrounded=54.36 recomended=55 links

chainstay length=420mm 52x11-28T chain length unrounded=54.29 recomended=55 links
chainstay length=420mm 52x11-30T chain length unrounded=54.76 recomended=55 links

chainstay length=425mm 52x11-28T chain length unrounded=54.68 recomended=55 links
chainstay length=425mm 52x11-30T chain length unrounded=55.14 recomended=56 links

chainstay length=430mm 52x11-28T chain length unrounded=55.07 recomended=56 links
chainstay length=430mm 52x11-30T chain length unrounded=55.54 recomended=56 links


How do you calculate this?
Is there any online tool for this?


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Posted: Tue May 16, 2017 6:19 am 


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