Edge Welcome to THE Forum! I have two Mongoose MTN bikes. Easy fix, large tube frames. Use steel, or some other metal to make a front mounting plate that will bolt to the motor. Use a U bolt to go around the frame and bolt to the plate. $5.00. Flip the sprocket over on the rear wheel so the teeth are on the outside. Alignment is a must! The sprocket must run true. It takes time. Flip the bike over and sit behind it, chains off. Spin it. Has to be strait. I use stainless steel cap screws and Aircraft nuts on mine.