<Li> The rider cannot become dirtied from chain grease or injured by "Chain bite" when clothing or a body part catches between an unguarded chain and a sprocket . </Li> <Li> Lower maintenance than a chain system when the drive shaft is enclosed in a tube . </Li> <Li> More consistent performance . Dynamic Bicycles claims that a drive shaft bicycle can deliver 94% efficiency, whereas a chain - driven bike can deliver anywhere from 75 - 97% efficiency based on condition . </Li> <Ul> <Li> A drive shaft system weighs more than a chain system, usually 0.5--1 kg (1--2 lb) heavier . </Li> <Li> Many of the advantages claimed by drive shaft's proponents can be achieved on a chain - driven bicycle, such as covering the chain and gears . </Li> <Li> Use of lightweight derailleur gears with a high number of ratios is impossible, although hub gears can be used . </Li> <Li> Wheel removal can be complicated in some designs (as it is for some chain - driven bicycles with hub gears). </Li> </Ul>

What is the difference between propeller shaft and drive shaft