Watching the wheels go 'round and 'round

Use this information to work out whether the front or back wheel of this bicycle gets more wear and tear.
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Problem



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Watching the wheels go 'round and 'round

The front wheel on the penny-farthing bicycle has a circumference of 200 centimetres.

If you were describing the circumference in metres, what would it be?
How many times would the wheel turn if the bicycle travels one kilometre?


The back wheel on the cycle has a 50 centimetres circumference.


If you were describing this circumference in metres, what would it be?
How many times would this wheel turn if the bicycle travels one kilometre?
Would the large or the small tyre get more wear and tear on a long journey?