[Rails] Class design Help!

I have 3 classes ("Truck", "Semi", "Motorcycle") that all inherit from
the "Vehicle" class.
Each subclass has an attribute for "Wheels" that tells how many wheels
the vehicle has (I do not store these values in the database because
they will never change)

I'm wondering what is the preferred method for handling this? Right now
I have individual methods in each class for "Wheels":

For example:

class Truck
def wheels
4
end
end

class Motorcycle
def wheels
2
end
end

class Semi
def wheels
18
end
end

Is there a better way??? Thanks

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