I am running the 240/40VR18 on mine. I got about 4200 miles on my stock wheels and close to 6000 on a Dunlop Elite III. Just recently put the Avon Cobra on, so I haven't been able to put a lot of miles on it as yet. However, it seems to have made the ride a bit smoother than my two previous tires (of course that could be just me), and it appears to grip the road a tad beter. My son has one on his Wide Glide and my daughters boyfriend has one on his night train, both of them really like the tire.
Avons's are made of a softer compound giving the bike a smoother feel. They will probably last a few less miles than the stock tires, but handle like a dream. Think about it this way, the tires are what connects you to the ground and are worth getting good ones. JMHO.
I'm running a stock size (200-55/17) Cobra on my NT. Once I found the "sweet spot" for inflation pressure, I felt that the handling improved and the bike actually feels lighter now.
I have one on my 2006 Night Train. Put about 2k miles on it so far and i like the way it rides.Hope I get more miles out of the Avon than the Metz it replaced. How much pressure are you running in yours Mr.Lucky,I am running 42 in mine
I'm running the Cobra's on both wheels and getting much better mileage than the Dunlops or Metzlers i've tried. Plus they look and handle much better too.