Look for the “L” or “R” sign on the axle or wrench flat. 2. The left pedal needs to tighten counterclockwise, the right pedal is tightened clockwise. 3. The thread of the pedal and crank arm needs to be aligned carefully, if the thread is misaligned, the crank will be mangled or cross-threaded. 4. It is suggested to tighten the pedals with a pedal wrench, and use some anti-seize compound if have.