They are equivalent and interchangeable. Some people will simply prefer one over the other.

"It is strange for you to ride a bicycle" (or "for you, it is strange to ride a bicycle") means you don't think it is normal to ride a bicycle, you find it is strange. Example: ME: Is it strange for you to ride a bicycle? YOU: Yes, I think it is really strange... I don't like bicycles... "It is strange of you to ride a bicycle" means "it is unexpected" that you would ride a bicycle. it means "I" find you riding a bicycle is strange. Example: If you normally don't ride a bicycle and I see you riding one, I would say "It is strange of you to ride a bicycle"

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