How much testing has been done on the new cranks? September 26, 2017 15:59 Updated A lot. We started development of the new cranks before Eagle™ itself was started. Related articles Why 12-speed? Couldn’t you make a wider-range 11-speed? Why does Eagle™ have a larger range? I was completely fine with what I had. Can you explain how/why a larger pulley wheel in the Eagle™ RD makes for “crisper, more efficient and quieter” shifting? Do I have to use the new Eagle™ chain with the Eagle™ chainring? Isn’t the narrower Eagle™ chain weaker? Comments 0 comments Article is closed for comments.