I was riding my 90's Trek 200 the other day and the RD snapped in 2 like a twig (because a twig became lodged in it while riding in more mountain bikey, off road conditions than I should have been) . The FD had already broken beyond repair last fall. I was hoping to just take off the RD and shorten the chain so that it will stay on one gear, but when I do that, the chain just skips up to bigger and bigger gears on the rear cassette. Clearly this conversion is a little more difficult.
The bike has vertical rear dropouts, if that's important
I was hoping for this to be a cheap/free fix for riding my bike around campus cheaply. Can I just get a chain whip and remove the rear chainrings and put the one I want back on with a spacer? Does it really have to be complicated?