A few simple ways to check that you have the correct position on the bike ;
1 Knees . If the front of your knee is sore it may be that your saddle is too low , if the back of your knee is sore it may be too high and you may be overstretched .
2 Handlebars . With a slight bend in your elbows and head facing forward the hub of the front wheel should be blocked from your line of sight by the handlebars .
3 Saddle . Sitting in the saddle with your heels on the pedals whilst pedaling backwards your leg should be fully extended at the bottom of the pedal stroke . This will ensure a slight bend in your knee when the ball of your foot is over the pedal axle .