I tried to research this online but didn't see any examples of this exact concern, which is if I gear down a very cheap mountain bike that has a 7 speed freewheel, do I run the risk of creating so much torque magnification that something bad could happen? Is it possible that something could break from the high torque? What about if and when I need to remove the freewheel? Might it be stuck from the high torque pedaling in the lowest gear?
Stock lowest gear is 24/28 and I will attempt either 20/28, 24/34, or 20/34 which is about 15.3 gear inches. I ride mostly on the street at a slow pace (about 10 MPH average) but I also like to ride thru grass slowly and even in grass uphills so I put a good deal of force on the pedals in that situation.