YOU SAID:

I never knew how to ride a bike

INTO JAPANESE

自転車の乗り方を知らなかった

BACK INTO ENGLISH

I didn't know how to ride a bike

INTO JAPANESE

自転車の乗り方を知っていません。

BACK INTO ENGLISH

Do not know how to ride a bike.

INTO JAPANESE

自転車に乗る方法を知っていません。

BACK INTO ENGLISH

Do not know how to ride a bike.