A NR/SR is 144BCD and GS seems to have come in both 144 and 116 so this must be a 144 crank.
check sheldon's website for measuring the BCD without the tool that Park foolishly stopped making.
I generally dig into all the dusty catalogs I have around here but this is a great site lovingly maintained by one of our members (or maybe a former member?) and has lots of great stuff on it.
http://velobase.com/Default.aspx
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk
Last edited by Bianchigirll; 03-07-12 at 07:48 AM.