Have had various front tires cup on me and read various reasons for it.I have tried different brands with the same results.I use the correct tire pressures and balance them but at roughly 3- 4000 kms it starts all over again.I know I use the front brake a lot because the rear drum has always been useless.I also am one to use the front aggressively because of the rear brake. I am sure that is causing it but wonder if it is common.I have a 1987 R80Rt.
Bruce
Bruce