ye front bearings on the pt can be a reguler problem
and rear bearing can often need replacing as well but the so eay to do on rear but it best to replace bearings in pairs as often is one side is going other is not far behind
from failing
just b4 i got my pt the owner replaced right side bearing and just after 2weeks (i had done about 400miles) left side totally fell apart
man did it make the most evil grinding sound @ one point i was under the impression a wheel had fallan lol