YOU SAID:

you don't know how to ride a bike until a bike rider teaches you how to ride a bike

INTO JAPANESE

自転車の乗り方がわからないのは、自転車の乗り方がわからない

BACK INTO ENGLISH

If you don't know how to ride a bicycle, you don't know how to ride a bicycle

INTO JAPANESE

自転車の乗り方がわからないなら、自転車の乗り方がわからない

BACK INTO ENGLISH

If you don't know how to ride a bicycle, you don't know how to ride a bicycle