From Rinard's spoke calculator on Sheldon Brown's web site at URL: http://www.sheldonbrown.com/rinard/spocalc.xls ERD = 613.0 0.0 700C 622 Mavic MA2 (ERD is Mavic's
spoke support dia + 3mm for nipples) ERD = 607.0 0.0 700C 622 Mavic MA3
It looks like the spokes from a MA2 wheel would be too long for a MA3 wheel. Why don't you replace
your "tired" MA2 with new MA2?