Yup (to the first). Fixie riders can achieve two 'gears' by mounting a sprocket on both sides of the rear wheel and flipping the wheel round if needed. More, as

Yup (to the first). Fixie riders can achieve two 'gears' by mounting a sprocket on both sides of the rear wheel and flipping the wheel round if needed. More, as always, from Sheldon Brown: https://www.sheldonbrown.com/fixed-conversion.html#flip-flop https://www.sheldonbrown.com/fixed-conversion.html#flip-flop