When I get on my bike and put pressure on my pedals or stand up and pedal, my chain slips. I want to know what the problem is so I can fix it myself as I don’t have a lot of money for a bike shop to fix it. Any help would be appreciated.
My whole chain slips when I put pressure on my mountain bike's pedals. I have a 3 speed at front and 7 speed on the rear.
Bike is approximately 5/6 years old. it happens on all gear combinations but happens mostly in front 2nd gear. And it steadily happened and got worse over time. Chain has not been replaced.