Often a lot of sidewall issues on any MC tire have to do with under inflation. Metzeler was having similar problems a while back and the cure was to run higher pressure than what had been run with the OEM tires. Check out Avon's website and see what pressure they recommend for your tire, your bike, and your conditions. The Metzelers on my bike (an FXR4) are recommended by Metzeler to run about 8-10 lbs. more pressure, both front and rear, than what HD recommends. That's a lot. I think the newer style tires have a different sidewall construction from the OEM Dunlops. Look for Avon's "fitment" pages on their site.
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