How much does chainring stiffness matter with Di2?

Discuss light weight issues concerning road bikes & parts.
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vinuneuro
Posts: 103
Joined: Mon Mar 06, 2017 10:34 pm
Location: Chicago

by vinuneuro

I am looking at some 46/30 cranksets, but once you get to that gearing range the rings look pretty skinny (a lot less material) compared to normal ones and they are are direct mount so less support without a proper spider. I can't imagine the SL-K modular in the first pic as stiff as the the normal SL-K below. But does it matter with a Di2 front derailleur? Image
SLKCOMPACT.jpg
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ooo
Posts: 543
Joined: Sat May 21, 2016 12:59 pm

by ooo

With less material shifting will be slower. Shimano FD expects more ramps, like this:
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46-32.jpg
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by Weenie


BdaGhisallo
Posts: 1949
Joined: Wed Mar 17, 2004 1:38 pm

by BdaGhisallo

Shimano’s hollow chainrings arrived at the same time as DI2 did - DI2 exerts a lot of force when it shifts chainrings and the more stout chainrings are needed to better handle the force of the DI2 FD.

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