Originally Posted by
NeilMonday
I believe RD stands for Road Double. If it was truly a crank made for single speed bikes it would have only one place for a chainring and that would almost certainly have a 42mm chainline. The difference between RDs and most other double road cranks is that they are marketed towards fixed gear/single speed riders and that is about it.
wait a second- are you sure about the road double thing? it doesn't have anything in place to allow for a second chainring, and is sold as a track/ss crankset.