I never really thought much about this, but it makes perfect sense.  Good 
to know... and it explains why on two separate conversions to 1xN 
derailleur drivetrains using pre-indexed chainrings, I've not ever had a 
single chain drop.

Anton

ridingthecatskills.com

On Monday, June 16, 2014 12:24:22 PM UTC-4, Jeremy Till wrote:
>
> Pre-index front chainrings and singlespeed chainrings have uniformly tall 
> teeth and are much better at holding onto a chain without the aid of a 
> front derailleur or chain guide device.  Not foolproof, but better. 
>

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