Enclosed mechanics on exercise bikes reduce noise and dust and covers for wheels protects you from damaging your fingers and other injuries. Adjustable resistance allows you to benefit from variable difficulty settings that can help you to start slowly and progress through the resistance levels for improved fitness and lung capacity. An easily reachable monitor helps you to read from the display which can be highly useful when trying to ascertain the length of time you have been exercising for or how many calories you've burned. The display should usually include distance, speed, time, calories burned and the resistance level. Stability on the equipment is dependent upon the weight of the front wheel so the heavier the front wheel, the more stable the bike.