I second Tippie's opinion! LOL! That "resonant frequency" is to be avoided at all costs!! Had a buddy fit the old Dunlop K-81 on the front of his BMW R90S, and went out to "scrub them in"!! Damn near scrubbed him in for sure. Hit a bump at about 110 mph and got a tank slapper that left big S black marks on the pavement!! From the front tire! He rode it out, but immediately removed that tire and never looked at it again!! LOL! I was behind him and thought I would be picking up pieces. Unfortunately, he passed about 6 years ago from a blood clot, and left me his R90S.