According to Shock Therapy, the XP 900 spindle design works well with 4+3 wheels. I'm sure 5+2 wheel are fine. You just have a lot less scrub ratio.
And to clarify, Raceline is claiming that their 4+3 wheels are about the same as the Method 5+2 wheels.
And to clarify, Raceline is claiming that their 4+3 wheels are about the same as the Method 5+2 wheels.