I felt that this was going to be an obvious fit, but met some doubters on the Yahoo Xtracycle forum.
To cut to the chase: A front 160mm adapter + 185mm rotor = sweet harmony as a rear brake on a Free Radical. This is all a trial-fit mock up as I wait for parts to complete my build.
"For 203mm Rotor"
160F = 140R = 185FR
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Thread: 185mm Rotor on a Free Radical...