What does the chainring have to do with SRAM YAW I'm shopping for 110 BCD chain rings and I noticed that some of the SRAM ones are labeled "YAW FD only".  As far as I can tell the derailleur doesn't touch the chainring so whats so special?  Can I safely use this chainring with a shimano FD?
To quote SRAM on YAW:
&quot;The front derailleur cage rotates to maintain a consistent angular relationship with the chain. Yaw technology eliminates the need for shifter trim. As a result, shifts feel more direct, more precise, and combined with the new Red crankset and chainrings, delivers an unmatched performance advantage in front shifting.&quot;
According to Velonews, you can use the chainring* with a Shimano setup, but you might get some chain rub (scroll down to compatibility grades). If you are not running a SRAM Yaw FD, I'd probably just avoid these rings and get normal ones.

See the &quot;Swapping chainrings&quot; section of the same article on issues with the small ring.