the sun ringle race rims have a few
equalizer 29- claimed weight of 520g
equalizer 31- claimed weight of 546g
mtx 29- claimed weight of 570g
mtx 31- claimed weight of 630g
mtx 33- claimed weight of 660g
mtx 39- claimed weight of 850g
personally i would be looking at mavic for light race rims that are really strong
namely the ex721 and a bit heavier duty rim the 823
good luck mate