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Avon SM Mark II motorcycle tires are sold as a suggested tire for use with side cars on motorcycles, side cars do not lean, they are also labeled for use as a rear tire on a motorcycle, they have a 5" by 16, a 4" by 18" a 3.5" by 19" and a 4" by 19" listed in the motorcycle parts catalog in front of me, otherwise checking to see what is sold as OEM on Urial motorcycles might be a way to go as well as they tend to be sold with side cars as well.
I've only mounted motorcycle tires on motorcycle rims but the sizes are close enough that I would personally give it a try but you are either going to want to take the risk your self and mount them your self or give the person mounting the tires fair warning! but with the rout you are going the car tire is going to be going on a rim larger then it was designed for, if it was the other way then it seems like everyone would be in greater danger, but your first test is to see if the tire will even stretch over the motorcycle rim.
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