I would commute 150 miles round trip on my sporty, and my shinkos never wore this fast....

 

I wouldn't bet your son or daughter on this. I've been to many track days, manufacturer numbers are also off. It's not one pressure solves all. Pirelli spokesperson told a bunch or riders to run 36PSI one year on one of their tires. After experimenting on a few combinations, they were totally off. Just because it comes from the manufacturer, I wouldn't hold it to that too much. They don't know your riding style, the bike it's on, and also what you want out of a tire.

 

In all fairness, in my case they knew that my question related to Marathon 888's on a touring bike that is used as such.

Part of my questions came from remembering that when the 880 came out, Metzeler recommended exceeding the posted tire pressures (They even had a tire pressure website for a time.) Since the sidewalls are considerably stiffer on the 888, that practice is no longer recommended.

 

Cruiser tires and sportbike tires are two completely different animals, you're comparing apples and oranges.

Thanks for the info though.

 

Your sporty is lighter than your dyna. That makes a difference. More load , faster wear.

 

Same science. Let it be cars, cruiser bikes, race bikes etc. The physics are the same when it comes to tire pressure. It's an art to get it to optimal performance. Let anyone tell you one specific pressure is the best is not true.

 

I've got 13,000 miles on the tire on the back of my FXD, using 37-38 psi. Please keep in mind most Harleys running gear is designed for a nominal 180 lbs. person. Make minor adjustments accordingly.

 

09 fdx,, I'm running Pirelli Night Dragons front and rear. I run the Front at 28-30psi Rear is 35-36. Both tires have the recommended dose of Ride-On to maintain fluid/stasis balance.
I always check and adjust when the tires are cold and keep an eye on seasonal ambient temp changes.
I'm not the least bit concerned about tire mileage longevity,, I want Grip.

p.s. Get a decent pressure gauge that has a proper range for the bike, there is no need to have a gauge that reads from 0 to 120psi.