Generally speaking, motorcycle tyres are more expensive than car tyres. But there is a reason for it. A lot more engineering and testing goes into a bike tyre than a car tyre. The tolerance and precision of them are much tighter. In the case of motorcycles, all of the handling, balancing and load-bearing depends on the few inches of rubber between the rim and the road. Also, losing your traction midway on a motorcycle is much more dangerous than losing traction when you are in a car. But in the end, motorcycles only need two tyres. So, the overall cost will be less than if you are to change all four tyres of a car.