[Bibio]

its caused by wrongly set up suspension and tyre pressures. less likely to be trail braking.

basically your tyre carcass wall is past its flex range and as such the tyre is being driven into the road surface rather then your suspension taking care of it. or you have an under/over inflated tyre.

10% tyre pressure rule (IIR you can thank luckypants) your tyre pressure should be no more or less than 10% over the cold pressure when hot. e.g. if your cold tyre pressure is 36psi you add 10% which would be 39.6psi for hot pressure. if your hot pressure is over the 10% you add air if your under 10% you remove air.