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PostPosted: Tue Jul 11, 2017 8:46 pm 
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Joined: Fri Mar 27, 2009 6:58 pm
Posts: 231
Location: Wet coast, Canada
Shimano of course does not list this a compatible option, but I'm just wondering if anyone has tried it with success? Difference is the front chainring is offset to the inside by 0.4 mm according the description at Excel Sports. I would think the low limit on the 9070 could easily handle this.

I have 9070 Di2 bike with 53/39 that I would like to change to 52/36 and but with the price of the rings being so high I can almost justify just buying a complete crankset.


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PostPosted: Wed Jul 12, 2017 1:01 pm 
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Joined: Mon Jul 07, 2014 8:15 am
Posts: 1613
Location: NorthEU
Froome use 9070 FD because it works better with Osymetric chainrings. So i would guess you crank swap should work well.

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Posted: Wed Jul 12, 2017 1:01 pm 


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PostPosted: Thu Jul 13, 2017 12:38 pm 
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Tinker, Taylor, Tart

Joined: Sat Nov 29, 2008 8:00 pm
Posts: 1930
Location: Sydney, Aus.
It'll be fine.


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PostPosted: Fri Jul 14, 2017 8:31 am 
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Joined: Sat Dec 17, 2016 7:28 pm
Posts: 28
I also consider new style shimano cranks with previous di2 generation front derailleur and what I have found as the most detailed answer on this is from a user rcb78 on another forum:

The only difference is that the crank has moved the small ring inboard by .4mm and kept the large ring in the original position. The front derailleur has been profiled to allow it to move closer to the seat tube before it contacts and stops moving. Most bikes will have no issue here, but a handful may find their older derailleur may not be capable of moving far enough inboard to stop chain rub in the climbing gears. Not may bikes will have this issue, but a few will.


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PostPosted: Fri Jul 14, 2017 1:46 pm 
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Joined: Sat May 21, 2016 12:59 pm
Posts: 254
You can try to compensate 0.4mm using di2 auto-trim feature

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