Outer chainring - OK to use double on triple?
I'm replacing some worn-out drivetrain components on my Jamis Aurora, specifically the chainrings (52/42/30), chain and cassette (11-32). So I go to the LBS to get 52t and 42t chainrings (I rarely use the 30t so I'm leaving it alone). They have the chainrings but the outer is a Shimano Ultegra 52t/130mm and the packaging says it is for a double. The LBS guys say it should work fine but I thought I'd double-check with the collective.
So, does anybody know if outer chainrings for doubles are different from outer chainrings for triples? Are the ramps and pins different? Will I have any problems with installation or shifting if I use the double?
I bought the 52t so I'll try it this weekend unless anybody says this won't work. Any comments or experiences are appreciated.