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 Post subject: DA Groupset questions.
PostPosted: Tue Jul 21, 2015 2:07 pm 
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Joined: Tue Sep 18, 2012 9:17 am
Posts: 72
Hi Guys,

I hope you can help I'm struggling finding definitive answers,

I'll explain what iv got atm and what I'm doing and hopefully it'll make sense.

At present I have ultegra 6700 with 50/34 praxis rings on a fsa crank and I'm buying a new groupset and cranks, but the groupset is coming tomorrow and the cranks will be a couple of weeks.

So this weekend I'm going to replace my shifters, mechs (rear short cage), cassette (with a 11-28) and chain (DA9000) but I will still have the 50/34 chainrings and cranks.

Then in a couple of weeks I will be fitting a 53/39 SiSL2 with spiderings.

My question is when the new chainrings arrive will the chain just swap over or will I have to get a new one to accommodate the larger chain rings.

Thanks in advance.


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 Post subject: DA Groupset questions.
Posted: Tue Jul 21, 2015 2:07 pm 


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PostPosted: Tue Jul 21, 2015 4:38 pm 
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Joined: Wed Mar 28, 2007 12:49 pm
Posts: 1586
Location: Near Horgen, Switzerland
In 99% of cases it will be fine.

But if the RD is already stretched when riding big-big as you've made a weightweenie miniumum length chain installation it is a good idea to test it very carefully in a workstand very gently before you ride, taking care that there's slack in the system before you make the final shift. Otherwise if you test it uphill in a sprint and the chain is too short you can wreck your frame, RD and likely the rear wheel.


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PostPosted: Tue Jul 21, 2015 6:56 pm 
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Hi, thank you for the reply,

What signs am I looking for that the chain maybe too tight?

Also do you have any idea what the correct chain length would be, as I'm going from 10 speed to 11 I don't think I can use the old one to measure can I?


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PostPosted: Tue Jul 21, 2015 7:34 pm 
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Joined: Sun Jun 07, 2015 6:57 pm
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Wonderman wrote:

What signs am I looking for that the chain maybe too tight?


Image

If you're in the big ring at the front - you don't want anything remotely like this happening....


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PostPosted: Tue Jul 21, 2015 7:38 pm 
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Hahaha excellent image!! I understand, hopefully will have this all sorted over the next couple of weeks and I'll post some pics of the finished thing (not looking like the above!!)


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PostPosted: Thu Jul 30, 2015 12:40 pm 
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Image

Hi guys, update on this, the above pic shows the rd with the chain in big/big can I get away with that? I know it's not a combination I should use


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PostPosted: Thu Jul 30, 2015 1:56 pm 
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Joined: Mon Jul 27, 2015 2:19 pm
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Location: Midlands, UK
That looks fine.

However - is that with the 50 or the 53? If that is the 50, changing to the 53 may be pushing the limits of acceptability.

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PostPosted: Thu Jul 30, 2015 3:12 pm 
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Hi Mike, no that's with 53/28, so I'm good to go?!


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PostPosted: Thu Jul 30, 2015 3:33 pm 
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Joined: Sun Apr 05, 2015 6:06 pm
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My chain is a bit tight (da9000), and although big big does go, the chain rubs on a small pin at the bottom of the rear mech and makes a rubbing noise. If it runs quietly then I think you're fine.


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Posted: Thu Jul 30, 2015 3:33 pm 


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PostPosted: Thu Jul 30, 2015 7:15 pm 
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No it's pretty quiet, there's a little bit of a noise because the chain line is quite extreme but it's ok, I also removed the drive side space from the sisl2 so the chain line was better


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