I Have a 09 ultra With 31k on it. I had the cupping tire problem with the stock tires and now run Metzlers.front tire has about 11k on it and is now starting to develop flat spots on the left side just off center. I thought it was starting to cup but there are a bunch of flat spots about 1.25 inch long. Any idea what could cause this?

 

Some say over/under tire pressures. Some say improper balance. Or could be a combination of both. Throw in bearings going bad, to headset bearings being out of adjustment. I had a belt separate on the front Metz a couple weeks ago and a huge knot developed.

 

I had the same problem. It was my front wheel bearings.

 

You would think you would feel something making that happen. That's crazy. Any chance it is rubbing?