I use Bridgestones on my Road Star cruiser and have to change the rear tire twice to one front, or around 8,000 FTire and 16,000 RTire. I had a 1100 VStar (Dunlop 404) and that was also the case. My friend has both a 1300 and a 1800 VTX. He does exactly the same thing and his total mileage will be very close to mine. I also have a friend with 05 GL1800 and he changed both tires at 16,000 a week ago (Dunlop 250) because he was leaving on a 2,000 mile trip. He thought he had another 2,000 left in them but the service manager thought not. It looks like I will get at least 16,000 out of the set on my 06 GL1800 with Dunlop 250s. A friend with a couple of Harleys, both of them really cruisers with bags (Ultra Glides), said he always uses 2 rears to 1 front.