Wide White Wall tires

[dooner]

To all,

I just purchased a 2007 Kawasaki Vulcan Nomad 1600 with the original wheels and tires. The bike has 7000 miles on the Bridgestones and probably have another 500 miles before they need to be replaced. I would like to purchase wide whitewall tires, but have been unable to locate any that fit the original tire specs. I've be able to locate a front tire from Metzeler, but not a rear tire that exactly fits the Bridgestone specs. Can the size of the rear tire be changed without affecting safety or handling? If the appropriate sized rear tire can't be located are there issues if I change the size of the rear wheel from a 16" to 15"? If any one has located a set of new wide whitewalls that will solve my problem, please let me know. Thanks in advance.

Dooner