MUni: Unicycling off-road? 'MUni' is short for 'Mountain Unicycle' and is commonly applied to any off-road unicycle. Off-road unicycling is probably the fastest growing sector of unicycling in the world. MUnis have to be very strong and generally have bigger wheels/tyres and longer cranks. MUni wheels are usually 24 or 26" and cranks are 150 to 175mm long. All unicycles are couriered and you will be advised of costs to your area upon ordering.