I'm assuming when you say Volk/Rays you mean Te-37's, and not the Se-37k's :
Volk Te-37      17x7.5   15 lbs
Motegi mr-7     17x7   24.5 lbs
Focal R3         17x7   ~25 lbs (the 18x7's are 26.3 lbs)
RH Evo M7000    17x7.5   ~21lbs (my guess, considering the S7 18x7.5 weighs 22.2 lbs)
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