I need help to fix my drive train on Titan Racing MTB, i am new to all this, and a casual rider, The gears/chain are slipping and the ride is very uncomfortable. I was advised to change / replace the entire drive train. My problem is i am not sure where to start and what to buy, i am also very remotely located. I would really love some advise. Regards. Mario from the Northern Cape-Aggeneys.