The bike didn’t service for the pass 2 years. All components are dry and lack of smooth. First is deep clean drivetrain by ultrasonic and remove all the cable for easy to clean the main body frame. Install back loose components with new grease and oil. Reset the cable length also change out rusty screw. We inject oil inside the cable housing for smoother working condition. Take a long hour to assemble back all the parts. Important the brake and gear system are work perfectly. Now the bike have a fresh start again.