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In reality there are features of a chain drive that cause problems for the rider:-
A chain needs to be lubricated, so you run the risk of getting oil and dirt on clothing.
If not kept oiled, the chain will corrode and get noisy.
The belt drive gets over these disadvantages. It replaces the chain with a toothed belt made of a high-strength, low friction material - often polyurethane reinforced with carbon fibre.
However, other components have to be redesigned to suit - both rear sprocket and front chain we’ll have to be designed to match the belt. What's more, the frame itself has to be altered, as the continuous belt will not go over the chain stay. This means that either the chain stay has to be produced with a break, or a removable dropout must be used.